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01 June 2005, Volume 26 Issue 3 Previous Issue    Next Issue

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Igneous Rock and Its Active Mode in Source Rocks of Rift Basin一An example of Dongying sag JIN Qiang, ZHAI Qing-long, WAN Cong-li 2005, 26 (3):  231-233.  Abstract ( 82 )   PDF (635KB) ( 271 )   Save Basic volcanic and intrusive rocks are normally distributed in major source rocks in many rift basins. The analytical data such as volcanic composition, texture, structure and alteration features as well as K-Ar isotope data from member-3 of Shahejie formation in Dongying sag are used, combined with the structural geology characteristics in studied area, to determine the volcanic genesis type and its effect on neighboring rocks. Taking Binnan basalts and Chunxi gabbros as example, the underwater effusion model for the basalts in source rock sedimentary environment and the intrusion model for the gabbros in the shallow-buried source rocks are developed. The helpful effects of these two models on source rock 's formation, hydrocarbon generation and expulsion are discussed. References | Related Articles | Metrics

Physical Simulation of Shale Content Requirement in Fault Zone Sealing Oil and Gas FU Guang, MENG Qing-fen 2005, 26 (3):  234-237.  Abstract ( 84 )   PDF (439KB) ( 190 )   Save Based on the analysis of the vertical sealing mechanism of static fault and its affcting factors, simulation of the cutoff value of shale content required in hydrocarbon sealing by static fault zone with different grain sizes is made. The result shows that the coarser the grain size in fault zone is, the lower the shale content requirement for oil-gas sealing is, and on the contrary, the higher the shale content requirement is. Using this result, as evaluating standard, to vertical oil-gas sealing evaluation of several major faults in northern Wuerson sag, good suitability is gained. It is indicated that such a standard for ev aluation of vertical oil-gas sealing in fault is feasible to use. References | Related Articles | Metrics

Fractal Geometric Characters of Fractural Distribution in Lunnan A ncient Buried Hill Carbonate Reservoir WANG Zi-ming, SONG Wen-jie, YANG Xin-hua, HUANG Chuan, YUAN Jun, LI Jian, DU Zhi-min 2005, 26 (3):  238-241.  Abstract ( 70 )   PDF (472KB) ( 195 )   Save The 3D geologic modeling for Lunnan buried hill carbonate reservoir is based on the fractural distribution and the outerop survey. The self-similar feature of the fractural style and distribution in this carbonate reservoir is described and analyzed. The procedure of the fractal geometric statistics of the fracture distribution and the calculation method of the fractal dimension are established. The fractal curves of the fractural distribution of the outcrop specimens are plotted based on the fractal geometric statistics of the buried hill body in different grid sizes. Finally, the quantitative fractal geometric formula for predicting the fractural distribution of the body is provided, which could be as a solid base for the seepage space modeling and the permeability geologic modeling in this carbonate reservoir. References | Related Articles | Metrics

Hydrocarbon Accumulation Model in Huoerguos Structural Reservoir Xue-yi, LI Tian-ming, YAO Wei-jiang, WANG Bing 2005, 26 (3):  242-244.  Abstract ( 81 )   PDF (463KB) ( 171 )   Save The geologic feature of Huoerguos structure in southern margin of Junggar basin is analyzed by focusing on its structural style, hydrocarbon accumulation condition and abnormal high pressure. Study shows that there exist deep and shallow structural styles in Huoerguos structure. Jurassic and Cretaceous are its principal source rocks. Ziniquanz formation of Paleogene is its main reservoir rock featuring thin fine sandstone and siltstone and averaging 2~8 m (12 m in maxmum) of single layer thick ness. Braided delta front subfacies is its sedimentary facies. The pressure is divided into two pressure system. The complex structure and hydrocarbon accumulation model under the condition of abnormal high pressure in southern margin of Junggar basin is proposed based on these analyses. References | Related Articles | Metrics

Formation of Condensate Gas Pool in Lunnan Low Uplift, Tarim Basin FAN Guang-hua 2005, 26 (3):  245-248.  Abstract ( 69 )   PDF (350KB) ( 175 )   Save The condensate gas pool of Ordovician, Carboniferous and Triassic in Lunnan low uplift in Tarim basin belongs to deep and ultradeep condensate gas reservoir. The petroleum geochemistry shows its oil and gas of marine facies originated from the Cambrian-Ordov ician source rocks. The carbonate rock (O) and detrital rock (C,T) could be classified into trapping assemblages of 2 types or 4 subtypes, which allow to form 10 kinds of condensate gas pools. Such variety of condensate pools here was resulted from multi-tectonic movements and multi- stage petroleum accumulations. It is believed that Lunnan low uplift is an area with abundant condensate oil and gas, and is a favorable area for further petroleum exploration in future. References | Related Articles | Metrics

Characteristics of Igneous Rock Lithofacies and Its Recognition Marks in Chagan Sag, Yin'gen Basin WANG Hui-min, JIN Tao, YANG Hong-xia 2005, 26 (3):  249-252.  Abstract ( 88 )   PDF (728KB) ( 286 )   Save The igneous rocks occur widely in Chagan sag of Y in gen basin. This paper presents the study of the igneous rock lithofacies and seismic recognition marks, the discussion of the relations between igneous rocks and oil-gas reservoirs, pointing out the favorable zones of igneous reservoirs. The igneous lithofacies types include explosive facies, overflow facies, volcanic-neck facies and volcano sedimentary facies, of which overflow facies is the most developed. According to the characteristics of the volcanic types such as high seismic wave velocity, high density, high magnetic susceptibility, high resistivity and high absorbability of seismic wave, the seismic recognition marks of four volcanic lithofacies and four intrusive lithofacies are set up. It is concluded that the deep fault controls both distribution of the igneous rocks and distribution of igneous traps. The favorable zones of igneous reservoir prospecting should be near the faul-developed belts. References | Related Articles | Metrics

Characteristic of Sedimentary Facies of Jurassic Toutunhe Formation (J2t2) in Shinan Field ZHANG You-ping, LING Zhi-hu, Parhat, LIU Wen-feng, SHUN Yu 2005, 26 (3):  253-255.  Abstract ( 67 )   PDF (443KB) ( 239 )   Save The detailed description of core from Shinan oilfield in Junggar basin is presented. The study of sedimentary microfacies and facies marker classifications is made by means of sedimentary characteristic of Jurassic Toutunhe formation (J2t2), integrated with well logs and comprehensive logging data. The results show that the rock type of J2t2 is dominated by lithic sandstone with lower composition maturity, reflecting fast sedimentary velocity and complex parent rock composition. For free bi-element structure, the formation features big width-depth ratio and varied location of channel and river island. Its braided fluvial facies is divided into bed subfacies and flood-plain subfacies followed by such microfacies as channel deposit, river island, natural barrier, bank lakelet, fluvial flooding plain and crevasse splay, including their vertical sedimentary sequence features and distribution. References | Related Articles | Metrics

New Understanding of Sedimentary Facies of Upper Guantao Formation in Zhanhua Sag YANG Dong-ming 2005, 26 (3):  259-262.  Abstract ( 76 )   PDF (549KB) ( 172 )   Save Former scholars always hold the views that the upper Guantao formation in Zhanhua sag belongs to fluvial deposit. In fact, this viewpoint of being fluvial facies or deposit can not be applied to explain such phenomena as stable distribution of fossil layers, subaqueous sedimentary structure and anticycle structural characteristic, etc. Through comprehensive study on the cores, well logs and geochemical data, the author believes that this upper Guantao formation should be classified as shallow water lacustrine deposit which has been testified by citing a great number of ancient or current cases about four sedimentary characteristics of shallow water lacustrine facies.Especally, a new method for determination the percentage of dark shale in this lacustrine shoreline and more detailed description of the deposit distribution of upper Guantao formation are provided. It is concluded that the discovery of shallow water lacustrine deposit is still a new interim understanding, but the widely distributed thin sand sheet and the lobate bar sands are favorable targets for further petroleum exploration and development. References | Related Articles | Metrics

Models for Hydrocarbon Migration and Accumulation of Yanchang F ormation in Chuankou-Qinghuabian Area, Erdos Basin GUAN Hong, WANG Zhen-liang, WANG Xiao-mei 2005, 26 (3):  263-265.  Abstract ( 92 )   PDF (384KB) ( 198 )   Save The analysis of petroleum accumulation conditions of U pper Triassic Y anchang formation (Chang-2 to Chang-7 sand layer) in Chuankou-Qinghuabian area in Erdos Basin is made, on which the dynamic process of petroleum accumulation during the period of geologic history in this area is reconstructed by digital basin modeling. The result shows that porous sand body is the mainly conductive system of hydrocarbon migration, and the distribution and style of sands control diretly the site of oil-gas enrichment in this area. The early Cretaceous is its main petroleum accumulation stage for abnormal flowing pressure developed in Y anchang formation, predominant conductive nature of sands and proper configuration of petroleum accumulation dynamics and conductivity. Based on these, 3 models for the main petroleum migration and accumulation in Chuankou-Qinghuabian area, namely intimate source type, close source type and distal source type are developed in this paper. References | Related Articles | Metrics

Prospect for Petroleum Exploration in Northern Minhe Basin FU Jian-kui, LI Yong-tie, LIU Zhong 2005, 26 (3):  266-268.  Abstract ( 99 )   PDF (399KB) ( 191 )   Save The northern Minhe basin (e.g. Zhoujiatai low uplift and Yongdeng depression) is previously considered to be of bright prospects for petroleum exploration. However, in view of the principal petroleum geologic factors' comparisons such as structural evolution, preservation, source rock, the match timing between important hydrocarbon generation and trap formation as well as reservoir quality, the situation is not so. The reasons are as follows: 1) the preservation condition in the northem Minhe basin is not so good as that of Bazhou depression in the southern Minhe basin due to different post-phase structural reversal intensity; 2) the northern Minhe basin may be poorer source rocks than the southern area; 3) the match timing between hydrocarbon generation and trap formation in the northern area is not so good as that of Bazhou depression in the southern area; 4) having influenced by early deep burial process, the reservoir quality in the northern area could be poorer than in the southern area. Hence, it is believed that the northern Minhe basin may be not so good as Bazhou depression in exploration potentials. References | Related Articles | Metrics

Oil-Bearing Detection of Pubei East Slope in Taibei Sag, Tuha Basin LI Zai-guang, YANG Zhan-long, GUO Jing-yi, HUANG Yun-feng, XIE Nan 2005, 26 (3):  269-271.  Abstract ( 60 )   PDF (630KB) ( 207 )   Save Based on the seismic attribute-geologic analysis, fault and shale seismic data analysis, integrated with output from available wells, the oil-bearing area can be generally determined. The relationship between seismic attribute and oil-bearing property can be estabi shed based on multi attribute optimized parameters. By using several evaluating models, information synthesis, clustering and multi-parameter classification, the optimal target with various character fields can be reached, thus decreasing the multi solution possibility, more precisely determining the range of oil layer distribution. For adjacent sand body without drilling data, the most possible oil-bearing intervals can be deduced by comparison. References | Related Articles | Metrics

Discussion of W avelet Mother Function by Using Spectrum Analysis Method and Analysis of Wavelet Time F requency LIU Lan-feng, LIU Quan-xin, YONG Xue-shan, GAO Jian-hu 2005, 26 (3):  272-274.  Abstract ( 76 )   PDF (568KB) ( 269 )   Save In-depth discussion of wavelet mother function is made by using spectrum analysis method. Aiming at Morlet wavelet, the relations between attenuation factor and main frequency, between attenuation factor and sc ale parameter, between attenuation factor and quality factor of filter are deduced by theory deduction and data experiment. Based on the time-frequency analysis principle, the wavelet function determined by spectrum analysis method is subjected to continuous wavelet transform followed by having realized wavelet time-frequency analysis. The validity is verified through theoretical model analysis, and in practical application, satisfactory results are gained by comparing with that from Fourier transform. References | Related Articles | Metrics

Application of Fixed Source Field Sounding to Petroleum Prospecting in Southern Margin of Junggar Basin ZHANG Chang-jiang, L1 Zhi-ming, HE Yi, DONG Wei-bin, HE Zhan-xiang 2005, 26 (3):  275-277.  Abstract ( 80 )   PDF (509KB) ( 182 )   Save Fixed source field sounding, an artificial source transient ( time- domain )electromagnetic sounding method, has been applied to field test in southern margin of Junggar basin with complex relief and geologic structure. This tested profile shows the clear features of faults, strata and structures, thrust nappe. in it, including the intensively deformed zone, imbricate thrust zone, reversal thrust zone, front syncline zone and local structures. These suggest the fixed source field sounding can be well used to piedmont prospecting with complex relief and geological structures. References | Related Articles | Metrics

Classification of Cretaceous Bottom Boundary in Hinterland of Junggar Basin XU Chang-sheng, WANG Bin, YANG Meng-yun, CHEN Yong-jun, WU Hai-sheng 2005, 26 (3):  278-279.  Abstract ( 76 )   PDF (437KB) ( 240 )   Save There are several opinions on boundary dlassification between Cretaceous and Jurassice in hinterland of Junggar basin, which have caused the confusion in the stratigraphic correlation and the integrated exploration researches. The unconformity surface between the Cretaceous and the Jurassic is resulted from the second episode of Yanshan tectonic movement. There could be many litho-stratigraphic traps between them, so proper stratigraphie classification has infuenced the recognition of litho-stratigraphic traps directly. This paper presents the correlation and demonstration of several opinions on the boundary classfication based on much information about the character of biological combination, the character of lithology combination, the goologic model, the forward model, the seismic feature, etc, has established the rational program for the stratigraphie classification. References | Related Articles | Metrics

Characteristics of Pore Structure and. Physical Property of Low Permeability Sandstone. Reserv oir HE Cheng-zu, HUA Ming-qi 2005, 26 (3):  280-284.  Abstract ( 100 )   PDF (344KB) ( 253 )   Save Quantitative relationship betw een pore structure and physical property characteristic of low -pemeability sandstone gas reservoir is studied on the bases of capillary bundle model ,fractal geometry ,surface and colloid chemistry and gas molecule motion theonry. The pore structure features small pore throat rnadius and low height- wide ratio, and much fnactal dimension, big capillary tortuosity and high pore-throat radius ratio. The phy sical property features low permeability, sensitivity to the stress, high capillary pressure and rreducible water saturation, but low initial water saturation, vertically gas- w ater distribution abnomal,coexistence of free molecule flow and viscous flow as well as the high velocity gas flow and low velocity water non-Darcy flow. The given relationship in this paper shows that the efect of various pore structure parameters on some physical property data is not the same. The ffect of pore throat radius on pereability is higher than that on capillary pressure, whereas the effect of fractal dimension on capillary pressure is higher than that on pemeability. The thickness of water film has not afected the effective pore throat size, but affected gas water distribution through altering wettability of rocks and then affected the permeability to gas and water. For very small pore throat in low pereability gas reservoir, the gas molecules assume free flowing, hence either in laboratory or in ield must consider the slippage effect corrections. References | Related Articles | Metrics

Productivity Analysis of Fractured Well in Low Permeability Reservoir YIN Hong-jun, LIU Yu, FU Chun-quan 2005, 26 (3):  285-287.  Abstract ( 99 )   PDF (254KB) ( 278 )   Save A mathematical model of unsteady percolation for well with finite conductivity vertical fractures considering thresbhold pressure gradient is developed. Its typical productivity performance curves are drawn and analyzed. The analysis shows that the longer the producing time, the greater the thresbhold pressure gradient is, and the faster the production decline is. The fractural conductivity and skin effect have a great effect on the initial productivity of fractured well. The greater the fractural conductivity, the higher the output of fractured well is, but the lower the extent of the incremental production is; the more obvious the skin fect, the lower the output of fractured well. These are of significance for in-depth understanding of the producing performance of well with finite conductivity vertical fractures in low permeability reservoir. References | Related Articles | Metrics

Anatomy on Various Methods for Determination of Open-Flow Potential in Gas Well TANG Hong-jun, LIN Ping 2005, 26 (3):  288-289.  Abstract ( 157 )   PDF (141KB) ( 307 )   Save 4 methods for determination of open-flow potential in gas well are discussed, including their theoretical bases, practical significances, computing accuracy, applied conditions, advantage and deficiency, inherent relations among the methods. Based on these,the applied conditions for the 4 methods are presented, which is as a guide for determinat ion of open-flow capacity in different oil wells. References | Related Articles | Metrics

Complex Displacement Test with Crosslinked Polymer and Pre-Crosslinked Gel Agent in Wenliu-25 East Block LOU Zhao-Bin, WANG Zhi-Peng, Z0U Li, LI Di-Shu 2005, 26 (3):  290-292.  Abstract ( 83 )   PDF (329KB) ( 238 )   Save In light of reservoirs with high temperature, high salinity and high heterogeneity, this paper proposed the techrique of using crosslinked polymer and pre crosslinked gel agent for complex displacement to further exploit remaining oil potential during high water-cut stage. These two profile control agents are of diferent oil displacement mechanisms and act as coordination of fooding and plugging.In order to testify the validity of the technique, field tests have been made in selected 9 well groups in Wenliu-25 east block, of which 7 have been fufilled, injecting agents of 7.922 6x10* m' in total. The results show higher injection pressure and improved sweep eficiency.The amount of cumulatively increased oil reaches 8305t, corresponding to 13 times that of simply using pre-crosslinked agent in effctiveness. References | Related Articles | Metrics

Field Test of MEOR in Fuyu Oilfield DI Sheng-jie, LV Zhen-shan, ZHANG Wei-guo 2005, 26 (3):  293-295.  Abstract ( 78 )   PDF (210KB) ( 203 )   Save Brief introduction of MEOR field test and principles, features and applications of various MEOR technologies in Fuyu oilfeld are made in this peper. The well microbial-timulation, microbial dewaxing, wax control and using microbial for water blockoff and profile control are analyzed, including gene tracking detection and performance analysis in field test of indigenous fungus activation. The prineipal factors affecting the stimulating ffects of the field tests are shown.341 above tests have been made with additional output of 28 375t and input-output ratio of 1:2. It is concluded that MEOR is not complicated in technology and implementation, and lower in cost and higher in benefit. References | Related Articles | Metrics

Forecasting Displacement Efficiency with Performance Data in Water Drive Oilfield HE Xian-ke, CHEN Cheng 2005, 26 (3):  296-297.  Abstract ( 73 )   PDF (181KB) ( 181 )   Save Oil displacement ffciency is a sigmificant index in water drive oilfeld, and is uually abtained by water drive cores experiments. In laboratory, only the ulimate oil displacement ffciency may be measured and it could not be applied for evaluating oil development eficiency. According to the characteristics of water drive reservoir, this paper deliberately deduce the method of applying goological parameters and production history data to forecast the oil displacement eficiency, based on the third water drive curve. The case study of a development sequence in Shuanghe oilfield has indicated that this expression is applicable and effective in evaluation of oil development fficiency. Meanwhile, it features the form conciseness, easy calculating and high credibility. References | Related Articles | Metrics

Pressure Distribution of Horizontal Section of Horizontal Drilling in Gas Reservoir LI Ping, LI Hai-tao, W ANG Yong-qing, LUO Zhong-ming, QIN Wei, LI Feng-bing 2005, 26 (3):  298-300.  Abstract ( 74 )   PDF (276KB) ( 181 )   Save Based on the gas flow model in gas reservoir and the fluid flow model in horiontal well, a couple model is developed and used for mumerical computing study of single flow performance in horizontal borehole. The complex pressure distribution in the model makes the Auid flow computation of horizontal well be fairly complicated, so the non-linear equat ion describing fAuid flow performance has been applied for space iterative computation followed by time iterative computation. This paper provides applicable computation procedure to calculate the pressure distribution of horizontal well in gas rservoir, and could be as a guide for design and production of horizontal wells. References | Related Articles | Metrics

Study on the Sulfide Precipitation Mechanism and Its Affect on Production and Exploi tation of Gas Reservoir ZHAI Guang-fu, LI Xiao-ping 2005, 26 (3):  301-303.  Abstract ( 117 )   PDF (289KB) ( 222 )   Save In the course of natural gas development, a great amount of sour gas reservoirs has been found. The sulfide precipitation brings about many problems to be solved for production of such wells or reservoirs. This paper reviews the mechanisms, ffected factors and mathematic prediction models of sulfur precipitation, according to lots of information. A number of understandings for the afct of sulfide precipitation on gas welreervoir production are given. Some isues to be urgently solved for it are pointed out particu larly. References | Related Articles | Metrics

Application of FMI on Sedimentary Facies Analysis in Luojia-Kenxi Area ZHANG Li-yan, JIN Qiang, WANG Ju-feng 2005, 26 (3):  304-306.  Abstract ( 84 )   PDF (726KB) ( 256 )   Save The formation microresistivity imaging (FMI) log data with core calibration from Luji-Kenxi area in Shengli oilfeld are used for correlation and analysis of the geological features including lithology, depositional structure, rock texture and sedi mentary rhythm reflcted by FMI shape and color as well as analysis of glutenite rescroir characteristic integrated with well log data. Six types of the lithofacies and dlassification patterms are established, which can be used for analysis of single well sedimentary microfacies. Hence, multi-solution interpretation from FMI data is eliminated, extending the application range of FMI dats, providing a solid ground for the study of glutenite reservoir. References | Related Articles | Metrics

Lithologic Interpretation of High-Radioactivity Mineral Profile and Its Shale Correction LIU Dong-fu, SHAO Chun-hua, HU Zai-kai 2005, 26 (3):  307-309.  Abstract ( 78 )   PDF (371KB) ( 216 )   Save The strata in Tuha basin are rich in minerals with high radioactivity, and their CR values are close to or higher than that of surrounding shale, thus resulting in that the shale content computation, lithologic identfication and interpretation can not be made by the traditional logging interpretation method for quartz sandstone. This paper presents some methods for computing the shale content and lithological analysis of shale-sand strata, which include the CNLflective porosity diferential method and the CNLCDL crossplot. The study also proposed the mechanism of efect of shale on sand conductivity and its shale-correction methods for sandstone reservoir with different sand-shale resistivity propertics. These methods have been well applied in the logging and geologic evaluation of high radioactity sand shale strata in Tuha basin and could be as a guide for simi lar strata evaluation study of other areas. References | Related Articles | Metrics

Application of Waveform Analysis to Petroleum Exploration and Development in Tahe Field YANG Zi-chuan 2005, 26 (3):  310-312.  Abstract ( 63 )   PDF (737KB) ( 188 )   Save The waveform analytical method can be used to develop the geologic model for the carbonate eservoir in Tahe field with heterogeneity and anisotropic property in its pore configuration, to rescarch the omnidirectional feature and synthetic mechanism of seismic waveform, to gain the relations between carbonate reservoir characteristic by means of diling and logging data, and finally to make a prediction of the growing degree of the reservoir. Good results have achieved from application of this method to Tahe field. References | Related Articles | Metrics

Application of Orthogonal Seismic Trace to 2D Seismic Lithologic Interpretation LI Yu-feng, SANG Hong, MA Quan-tian, WANG Cheng-lin, JIN Ying-ai, LIU Hu 2005, 26 (3):  313-315.  Abstract ( 84 )   PDF (517KB) ( 185 )   Save The orthogonal seismic tmace set up on the concept of complex seismic trace is combined with the real seismic trace to form the imaginary part and the real part of the complex seismic trace. Though the phase shift of 90to real seismic trace, the orthogonal seismic trace is taken, and the shape of the seismic wavelet turns from the zero-phase wavelet to the unsymmetrical wavelet. So the orthogonal seismic trace can reflect clearly some fuzzy and dim amplitude information in the record of the real seismic trace. Generally in the routine display profile, orthogonal seismic trace and real seismic trace have not obvious dfference but 90° phase diference. After the suitable display parameters are adopted, the diference in amplitude becomes relatively obvious. On the 2D offset seismic profile and its orthogonal seismic trace profile, comparison and explanation of the ampltude value corrsponding to the same interval are conducted in order to find out the abnormal amplitude area in plane, ie. the distribution range of possible lithologic anomalous body. By means of this method, one abnormal amplitude ditribution area is found in Silurian gystem, the west and north of Well TZ32 in Tarim basin. The anomaly well matches the driling results of Well TZ34 and Well TZ32. References | Related Articles | Metrics

Application of Remote Sensing to Optimizing of Seismic Line A rrangement HU Yan, ZHANG You-yan, YE Yong, YE He-fei 2005, 26 (3):  316-317.  Abstract ( 59 )   PDF (288KB) ( 170 )   Save With improvement of degree of prospecting, oil-gas exploration in complex area and complex hydrocarbon reservoir has become the main target. Particularity of complex area tends to having low signal-to-noise ratio, results in diffcult data processing. For improving it, feld data gathering is an important step. Taking 3D mountain seismic line arrangement crossing Well Huo-10 as an example, this paper discusses how to optimize seismic arrangement, improve seismic data quality, raise operating efficiency and decrease the cost of prospecting by applying the information provided by remote sensing technology such as fine geologic infomation, digital elevation, geomorphologic information and surface lithology information. References | Related Articles | Metrics

On A ccumulation of Water- Soluble Gas Released from Formation Water Resulted from Tectonic Uplift WANG Qing, ZHANG Zhi-huan 2005, 26 (3):  318-321.  Abstract ( 69 )   PDF (283KB) ( 244 )   Save This paper presents the geological factors controlling the natural gas solubility in the formation water, the methods used to calculate the solubility, and the quantity of natural gas released from fomation water due to tectonic uplift. Three cases , Urengoy gas-feld of West Siberian basin , Weiyuan gas feld of Sichuan basin and Kela-2 gas -field of Tarim basin, about water soluble gas being converted into free gas are analyzed. The composition characteristic of high content of methane in free gas reservoir and the main reasons are discussed. The accumulation models of water sduble gas in the three cases are summarized, and four contolling factors are provided. References | Related Articles | Metrics

Application of the Theory of Slope Break to Petroleum Exploration YOU Li-wei, PENG Jun, CHEN Guo, WANG Yan 2005, 26 (3):  322-325.  Abstract ( 90 )   PDF (401KB) ( 269 )   Save The theory of slope break is an advance of sequence stratigraphy applied in terestrial basin. This paper reviews the application of this theory to petroleum exploration and points out that slope-break zone can control the development of continental sequence stratigraphy, distribution of the depositional system tracts and sand bodies. Hence, the first lake flooding surface in terrestrial basin and the scope of distribution of its sand body and source rock can be determined by the theory of slope break. Slope-break zone could even control the hydrocarbon migration and accumulation. Based on these, this paper discussed the relationship between slope-break zone and non-structural reservoir and highlights how to apply this theory in prospecting of non-structural oil-gas reservoirs. It is concluded that the theory of slope break is a new thought of looking for non-structural reservoir. References | Related Articles | Metrics

Chinese Continental Crust is One with Abundant Hydrocarbons GUO Zhanqian, YANG Hai-bo 2005, 26 (3):  326-330.  Abstract ( 123 )   PDF (307KB) ( 289 )   Save As a solely continental crust with compressive stess on all sides in global nine continental crusts, Chinese continental crust features widespread and the most active volcanic activity, hence it is main area of intraplate seismicity in the world. In view of analysis of C, H contents in Chinese continental crust, they are higher than Clarke value of global average content. This means the hydrocarbons composed of such C and H should be also higher than the average hydrocarbon content in global continental crust. Meanwhile, it is the active volcanic activity that becomes one of positive causes for Chinese continental crust should be in hydrocarbon enichment, of which it contributes the kitchen model for hydrocarbon generation for organic source mechanism; its hydrothermal fluid contributes the catalytic model for hydrocarbon generation; its mantle-derived CO2 and H2 contribute compound mec hanism for hydrocarbon generation; its hydrot hermal water contributes the inorganic carbon compound model for hydrocarbon generation, and it also directly contributes mantle-derived hydrocarbons. 'Therefore, Chinese continental crust as a hydrocarbon- enriched one should be reasonable. In addition, higher C, H contents in Chinese sodimentary rocks than the average of global statistic va lues support the viewpoint that Chinese continental crust and upper continental crust should also be of hydrocaubon-eniched materials. In 2002, a new Yumen oil region was found in its basinal basement rock after 70-year development histary, which indicates that the deep continental crust () of China still have a great deal of oil-gas resourcs to be explored and discovered. References | Related Articles | Metrics

A Theoretical Study of Primary Migration of Oil and Gas LI Chuan-liang 2005, 26 (3):  331-335.  Abstract ( 67 )   PDF (465KB) ( 260 )   Save According to the theory of mechanics and physical chemnistry, a quantitative study is conducted on the mechanism of primary migration of oil and gas. It shows that oil and gas moves fom source rock to reservoir mnck in continuous phase. The motivating farce of primary migation i the coalition of buoyancy and capillary pressure. The hydrocarbon expulsion efficiency of source nckprimary migation is usually high because of its propenty of natural drive. However, the hydrocarbon accumulation or reservoir formation requires some thickness of source rock. References | Related Articles | Metrics

Porosity V ariation in Elastic Deformation of Rock REN Yong, SUN Ai-ying 2005, 26 (3):  336-338.  Abstract ( 71 )   PDF (220KB) ( 307 )   Save The variation of porosity in elastic deformation of rock is studied in two aspects. Firsly, based on the four compressibility factors in rock and their relations among them, it is proved theoretically that the porosity variation is related closely with the net confining pressure, showing that if the net confining pressure is invariable, so is the porosity; otherwise, the porosity is variable. Secondly, the experimental data are used to testify that the porosity is variable in elastic deformation. Such a disproof method means that the formula for rock matrix compressibility factor at constant porosity is deduced followed by substituting the experimental data into the fomula, comparing calculated value with measured value of the compressibility factors. If the difference of both values is extremely large, the former hypothesis is not valid, namely the porosity is variable. The results from the theoretical and experimental analyses indicate that the porosity is nomally variable during elastic deformation of rock, hence porosity correction has the basis, whereas the principle of porosity invariability is not valid. References | Related Articles | Metrics

4D Geology А.С.Кашик, С.Б.Денисов 2005, 26 (3):  339-342.  Abstract ( 127 )   PDF (569KB) ( 137 )   Save 4D geologic space is composed of 3D space and time scale, by which the recorded geologic process is basis for geologic space recovery. In terms of concept of 4D geology, the geologic process could be described as the time chain. The geologic significance at a time can be explained by time scale slice up according to 3D geologic model. 4D geologic model has been widely applied to analyses of palaeostructure, palaeogeomorphology and depositional stting. Related Articles | Metrics