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01 January 2019, Volume 37 Issue 1 Previous Issue    Next Issue

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PaleoSedimentary Setting of The Lower Permian Fengcheng Alkali Lake in Mahu Sag,Junggar Basin QIN Zhijun1, CHEN Lihua1, LI Yuwen2, WANG Tingting3, CAO Jian3 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160101 Abstract ( 283 )   PDF (300KB) ( 1240 )   Save The high?quality hydrocarbon source rocks of the world’s most ancient alkali lake are found in the Lower Permian Fengcheng formation of Junggar basin. The understanding of development model and hydrocarbon?forming evolution of the Fengcheng formation have been limited due to unsystematic analysis about its paleo?sedimentary setting up to now. This paper uses petrological and geochemical methods to study the characteristics of its landform, climate, lake water depth, salinity and water temperature, and the results show that Mahu sag is a closed lake in the depositional stage of Fengcheng formation as a whole, and its ancient landform appears asymmetric halfgrabenlike sag with steep slope in the west and gentle slope in the east, and the sizes of lake bays are distributed in it; the climatic condition of the alkali lake formation in this stage is semi?arid, characterized by that the evaporation was greater than the recharge, with seasonal humid?arid?alternate environment; the lake water depth is shallow in general, developing dark fine?grained source rocks; the water body is of high?salinity medium, the highest salinity occurs in second member of Fengcheng formation, indicating the alkali lake is most developed in this member; and the paleotemperature of the water body is relatively high, equivalent to warm to partial warm phase Related Articles | Metrics

Characteristics of Yingshan Dolomite Reservoir in Gucheng Low Swell of Tarim Basin with Favorable Area Prediction QI Jingshun1, ZHENG Xingping2, HUANG Shiwei1, ZHANG You2, SHAO Guanming2 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160102 Abstract ( 98 )   PDF (300KB) ( 68 )   Save From analyses of six new drilling wells抍ores, sidewall coring, rock thin section and imaging logging data, the dissolved pores,intergranular pores, structural fractures and dissolved fissures are the main reservoir spaces of the carbonate reservoirs of Ordovician Yingshan formation in Gucheng low swell in Tarim basin, and the major reservoirs of Yingshan formation are dominated by heterogeneous fractures and vugs. The complex pore origins, including early meteoric water leaching, dolomitization, hydrothermal modification after crude oil charging, result in the strong heterogeneity of them by both constructive dissolution and destructive filling effect. It is the ancient landform highland of lower member of Yingshan formation that cut fault?communicating hydrotherm at the basement, modifies the pre?existing porous and permeable zones ranging from hundreds to thousands meters, and controls the distribution of relatively high quality reservoirs by the early meteoric water leaching effect followed by dolomitization. Seismic prediction of the reservoirs shows that the large?scale and effective reservoirs could be found in the ancient landform highland, the superimposed belts between dolomite and basement?cutting faults in west?central Gucheng low swell Related Articles | Metrics

Pore and Throat Characteristics of Chang6-Chang8 UltraLow Permeability Sandstone Reservoirs of Yanchang Formation in Fuxian Exploration Area, Ordos Basin ZHENG Zhongwen1,2, ZHANG Hansheng1 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160103 Abstract ( 77 )   PDF (300KB) ( 383 )   Save The micro?pore structures and throat distribution of Chang6-Chang8 reservoirs of Yanchang formation in Fuxian exploration area of Yishan slope in Ordos basin are described in detail by means of constant speed mercury injection test, crude oil boundary layer test and fractal geometry method, and the control effect of micro?pore structure features on the percolation capacity is quantitatively characterized.Result shows that the sandstone reservoirs of Chang6-Chang8 members in this area are characterized by big pores and fine throats with strongly curved pore throat and size disparity, and dominated by distribution patterns of single?peak positive skewness and double?peak coarse skewness, for which the size and distribution of the throat radius could be decisive factor controlling the low?permeability reservoir’s fluid flow capacity. Also, they have good fractal geometry structures, and the sedimentary environment and diagenetic differences allow the reser?voirs to be of multi?fractal properties, while crude oil adsorption layer thickness in the extra?low permeability reservoirs accounts for 15%~23% of pore volume, and it is the formation of crude oil adsorption layer that could make the reservoir percolation capacity become poor Related Articles | Metrics

Sedimentary Microfacies and Favorable Reservoir Distribution of Yingshan Formation in North Slope of Tazhong Uplift, Tarim Basin HAN Jianfa1, REN Ping1, CHEN Jun1, LIN Changsong2, WANG Jinsheng1, LI Hao2 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160104 Abstract ( 106 )   PDF (300KB) ( 68 )   Save According to analyses of cores, thin?sections, imaging logs and outcrops information, nine microfacies and classified as four microfacies sequences within the Yingshan formation of Late Ordovician in central north slope of Tazhong uplift in Tarim basin were recognized. There existed four types of reservoir spaces in Yingshan formation, which are dominated by fracture?vugular pores, followed by small vugular pores, seldom fractured and vuggy spaces. The result shows that the high energy microfacies sequence is the primitive materials for the favorable reservoirs, easily forms small vugular pore and fracture?vugular types of reservoirs, and these several types of reservoirs overlap followed by shaping the high quality reservoir. The low energy microfacies sequence occur as undisturbed formation or barriers, but it could produce local bits of fractures and vugular/dissolution pores, which may form relatively small?scale fractured and fracture?vugular pore types of reservoirs in this area Related Articles | Metrics

Hydrodynamic EnergyBased Sedimentary Microfacies Distribution of He8 Member of Lower Shihezi Formation in Block25, Sulige Gas Field LIU Jinku, SUN Yongliang, XIE Jinmei 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160105 Abstract ( 103 )   PDF (300KB) ( 422 )   Save In order to more accurately predict the distribution of effective sandstone of braided channel reservoir of He?8 member of Lower Shihezi formation in Sulige gas field, and guide its efficient development, this paper studies the braided channel sedimentary microfacies distribution based on hydrodynamic energy. The identification signs and overlapping model for single channel sand bodies in braided river reservoir of He?8 member of the Lower Shihezi formation in Sulige gas field were established to make classification and correlation of these sand bodies. The logging response features of its different sedimentary micofacies were analyzed to develop the transformation model from cores to logs and single well sedimentary microfacies types in the study area. The enveloped characteristics of GR and CNL logs were used to reconstruct the hydrodynamic index curve, and finely describe the planar distribution of the sedimentary microfacies constrained by wa?ter energy thickness distribution. The result shows that the predicted results of effective sands distribution are very closed to that from real drilling application, which can provide effective guide for the gas field development and well deployment Related Articles | Metrics

Application of HighResolution Sequence Stratigraphy to Fine Reservoir Description YAN Haijun1, JIA Ailin1, GUO Jianlin1, YANG Siyu1, ZHANG Yunhai2a, ZHENG Xiongjie2b 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160106 Abstract ( 153 )   PDF (300KB) ( 490 )   Save Fine reservoir description is the basis and key for later exploration and EOR as well as keeping stable production of an aged oilfield. However, there exist uncertainties in study of single sand body connectivity and scale during fine reservoir description, due to lack of data and multiple solutions of geological interpretation. This paper developed the isochronous stratigraphic frameworks and sands overlap model by using high?resolution sequence stratigrphy method and analysis and correlation of comprehensive data to effectively guide the reservoir description and the single sand body anatomy. Taking the gas injected reservoir in Hei?59 block in Jilin oilfield as an example, the fine reservoir description and single sand body detailed anatomy have determined the vertical and lateral distribution of the reservoir, described the development stages and scale of single sand body, and realized the 3D visualization distribution of the sand bodies in this area Related Articles | Metrics

Influence of Micropores Occurrence on Logging Evaluation in Low Porosity and Low Permeability Sandstone ReservoirsA Case Study of He8 Member in Block A of Sulige Gas Field LIU Min1SHEN Huilin1ZHANG Lixu1HUANG Hongkui1XIE Yingfeng1DING Lei1,2 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160107 Abstract ( 88 )   PDF (300KB) ( 284 )   Save In low porosity and low permeability sandstone reservoirs, the development of micropores bring some difficulties to the evaluation of rock conductivity and petrophysical parameters. Taking Block A in Sulige gas field as an example, the micropore limit in this field is redetermined as 0.15 μm by means of the principle of balanced dynamics and resistance, and the "non?Archie" phenomenon is explained by numerical simulation and mathematical statistics. The studies show that the pore type determines proportion of micropores, and the big?ger the porosity, the smaller the proportion of micropores; with the proportion of micropores increasing, the permeability is obviously decreased; the sandstone reservoir with low porosity and permeability is characterized by significantly increamental neutron porosity and small changes of the density and the interval transit time, and with the increase of clay content, the irreducible water saturation increases,the conductive network develops, conductivity enhances, and the resistivity decreases. Therefore, the micropores occurrence is the main reason for the low resistivity phenomenon appeared in the low porosity and low permeability reservoirs in this area Related Articles | Metrics

Prediction of Shale Gas Favorable Areas by Fuzzy Optimization Method Based on Spatial Overlay Technology of Geographic Information System ZHENG Kaige1, CHEN Fugui2, HU Baolin3, LIU Huihu3, XU Hongjie3, LIU Bingchang3 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160109 Abstract ( 64 )   PDF (300KB) ( 208 )   Save On the basis of comprehensive factors such as reservoir, economic benefit and resource scale, etc, this paper refers to the research results from North American shale gas favorable areas prospecting, combines with the geochemical and sedimentary characteristics of Shanxi shales in Huainan coalfield, screens out eight influencing factors as the optimum indexes for shale gas favorable areas evaluation,and develops corresponding models for it. By using analytical hierarchy process (AHP), the weights of these evaluation indexes are present?ed, and by means of statistical analogy, undetermined coefficient method and fuzzy optimization technology, the membership values of each evaluation parameter are determined. Finally, the shale gas favorable areas of Shanxi formation in Huainan coalfield are comprehensively evaluated and predicted by fuzzy optimization and geographic information system(GIS) spatial overlay techniques. The results show that the favorable areas can be divided into four categories, of which the southeastern part in the study area, Gudian?Guqiao?Guiji?Liuji rural areas and Yanglou rural area are the most favorable areas for shale gas development Related Articles | Metrics

Analytical Method of Water Displacing Oil Theory GAO Wenjun1, FU Yanxin2, PAN Youjun1, XU Yunheng1, XU Ying1, ZHANG Debin1, WANG Shaoxia1 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160110 Abstract ( 189 )   PDF (300KB) ( 1089 )   Save Based on the previous high?accurate new oil?water relative permeability studies, this paper established a new relationship between oil?water relative permeability ratio and water saturation. Combined with Leverett function and Welge equation, it deduces the analytical formulae for waterflood frontal water saturation, waterflood post?frontal average water saturation, water?breakthrough average water saturation and oil displacement efficiency, in order to calculate waterflooding indices and automatically draw relative the classic curves.The case study from Qiuling oilfield shows that this analytical method is not only used to calculate the waterflood frontal saturation and other indices, but also draw such classic curves as the oil displacement efficiency vs. injected fluid volumes, water cut vs. injected fluid volumes, etc Related Articles | Metrics

Microscopic Mechanism of Polymer Flooding in Glutenite Reservoir of Lower Karamay Formation in East District7(1), Karamay Oilfield QIAN Genbao1a, XU Changfu1b, CHEN Yukun1b, WANG Xiaoguang1b, LIU Hongxian2, LIAN Guihui1b 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160111 Abstract ( 148 )   PDF (300KB) ( 600 )   Save To reveal oil displacement process in glutenite reservoir by polymer flooding process, this paper chooses the representative core samples and presents the oil and water producing characteristics during the process of water/polymer flooding and the remaining oil distribution after water/polymer flooding of the samples with different modal pore structures in the Lower Karamay glutenite reservoir of East District?7(1) in Karmay oilfield by means of online CT scanning monitoring and NMR approach. The study shows that such core samples are of significant differences in flooding efficiency, of which duel modal sample is the highest by polymer flooding process; however, they have the same displacement patterns: the water flooding tends to sweep/produce the zones with high oil saturation, while polymer flooding can enlarge the areas swept by previous water flooding process, but the crude oil in low?oil?saturation zones and isolated pores may not be produced on the whole Related Articles | Metrics

Classified Evaluation of Stress Sensitivity in Tight Reservoir Rocks ZHANG Zhiqiang, SHI Yongmin, LI He 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160112 Abstract ( 100 )   PDF (300KB) ( 418 )   Save Analysis on stress sensitivity of tight reservoir rocks is of an important significance in accurate understanding of formation damage during oil?gas development and reasonable evaluation of oil?gas well productivity. In view of real situation of tight reservoir rock’s percolation changes resulted from stress field unsteady state change by waterflooding process, three types of typical rock samples (argillaceous siltstone, siltstone and medium?fine grained sandstone) of Yanchang formation in Ordos basin are used to make a measurement of the stress sensitivities of the tight reservoir permeability, and conduct correlation of the features of stress sensitivity from the three types of rock samples by means of linear fitting equation. Meanwhile, the influences of the rock constituents and microstructures on the stress sensitivity are analyzed comprehensively. Results show that with effective stress increasing, the argillaceous siltstone’s permeability decreases quickly,and its stress sensitivity is strong; the siltstone’s permeability decreases in medium range, and its stress sensitivity is medium to strong;and the medium?fine grained sandstone’s permeability decrease slowly, its stress sensitivity is weak. Through core, thin?section, SEM,whole rock X?ray diffraction analyses and mercury injection experiment, it is suggested that the stress sensitivity features of the tight reser?voir rocks are mainly influenced by two key factors of the mineral constituent and pore structure, while micro?cracks in the reservoir rocksare of the largest effect on the stress sensitivity Related Articles | Metrics

Composite Profile Control System of Secondary Crosslinking Gels and Polymer Microspheres for Low Permeability Reservoir QIN Shan1, WANG Jian1, NI Cong2, WU Fengdou1, CHEN Jia1, ZHANG Yangyang3 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160113 Abstract ( 146 )   PDF (300KB) ( 294 )   Save This paper presents a composite deep profile control system of secondary crosslinking gels and polymer microspheres, aiming at the problems of water cut rising fast and ineffective or poor effective water circulation in Wen?8 block of Wenmi oilfield in Tuha basin. The organic chrome crosslinking agent is used as the first crosslinking gel, and the JQ?1 and FJ?1 phenolic composite crosslinking agent is selected as the second one. At 25℃ and after 5 hours, the first crosslinking gel’s viscosity is 374 mPa·s; at 78℃ and after 10 d, the secondary crosslinking gel’s viscosity reaches 17 005 mPa·s. The polymer microsphere is characterized by good anti?temperature and anti?salinity, and hydration time stability. At reservoir temperature of 78℃ and salinity of 40 000 mg/L, after 20 d, the expansion multiplying factor of it is 6.08. Compositing the secondary crosslinking gel system with SD?320 microspheres for profile control, the estimated resistance factor by core flow experiment is higher than 20, the residual resistance factor is bigger than 18, and the recovery factor is enhanced by 15.5%. It is concluded that this composite profile control system can not only prevent plugging agent from leaking, effectively, but also can fit the high reservoir temperature of 78℃, being of good application prospect in Wen?8 block of Wenmi oilfield Related Articles | Metrics

Feasibility Study of Dumpflooding Technology for Bachu Reservoir in Tazhong 4 Oilfield,Tarim Basin TANG Yongliang, WANG Qian, LI Erpeng, GAO Dengkuan, LIAO Feiran, SU Zhou 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160114 Abstract ( 142 )   PDF (300KB) ( 501 )   Save The pebbly sandstone section of the Carboniferous Bachu formation in Tachong 4 oilfield in Tarim basin is a layered edge water reservoir of burial depth of about 3 700 m and characterized by weak natural energy and low degree of formation pressure. The underlying Donghe sandstone section of it is characteristic of in?situ large water body and higher degree of formation pressure. The interlayer pressure difference between the 2 sets of series of strata or reservoirs ranges from 15 to 25 MPa. This paper analyzes the field case of in?situ dumpflooding from interlayer cross flow caused by the interlayer pressure difference, and builds a numerical model for the reservoir geology and development features of Tazhong 4 oilfield, by which the dumpflood development indices by using different types of producers (vertical well and horizontal well) as dumpwater injectors and different well patterns as well as interlayer cross flow are simulated. The results show thatapplication of dumpflood technology to such a layered edge water reservoir is feasible in this oilfield and further pilot test area of well group is selected as well Related Articles | Metrics

Reason Analysis and Solution for LogSeismic Data Discrepancy in 3D Seismic AreaA Case Study of Well Xidi2 3D Seismic Area in Beisantai Swell, Junggar Basin WEN Tiemin, LUO Xiaoxia, WU Xinxing, LI Daoshan, LI Longmei 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160115 Abstract ( 122 )   PDF (300KB) ( 351 )   Save The study of 3D prestack time migration profile of Well Xidi?2 indicates that the time domain profile of the Wutonggou formation as a target zone in drilled well with hither structural position has bigger t0 compared with well logging data. Such a log?seismic discrepancy occurs from the bottom of Paleogene in this area. The analysis suggests that the reason for it mainly results from the lateral velocity changes of the Cenozoic here. Prestack depth migration processing technique is an effective approach for precise imaging of complex structures.This paper uses Kirchhoff ingegral method to make prestack depth migration processing, and gets the south?north reducing velocity model for the space variation in this area. Finally, the morphology of formation has been corrected, the relative relationship between wells has been recovered, and the problem of the log?seismic data discrepancy has been resolved Related Articles | Metrics

Prediction of SWave Velocity Based on XuWhite Model DOU Yan1GAO Gang1LIANG Lin2XIE Xiaoqing3PENG Rui4 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160116 Abstract ( 264 )   PDF (300KB) ( 426 )   Save In the prestack inversion and prestack seismic attributes analysis，the lack of S?wave information usually leads to a bad influence on petroleum exploration by decreasing accuracy of seismic data interpretation. Hence, Prediction of S?wave velocity by using other methods is more significant. Xu?White model，compared with other methods，comprehensively takes account of the influences of porosity，density and clay content，which is suitable for real sand?mudstone formation characterization with higher predictive accuracy. But the appli?cation of Xu?White model has been limited because the aspect ratio of the inclusion can not be measured in the laboratory. This paper studies the Xu?White model，introduces simulated annealing algorithm and particle swarm optimization（PSO）to seek optimal solution，by which the local minimum solution is avoided during searching process，and the accuracy of S?wave velocity is obviously improved. The case study from real seismic data processing in an area of Dagang shows good results in application by using this method Related Articles | Metrics

Volcanic Framework Parameter Determination in Nanpu 5th Structure, Huanghua Depression FU Dong1, ZHU Xuehuan2, SHAN Shasha3 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160117 Abstract ( 100 )   PDF (300KB) ( 214 )   Save Focusing on the status of difficult determination of volcanic framework parameters of the Paleogene Shahejie formation in Nanpu 5th structure of Huanghua depression, on the premise of accurate division of the volcanic rock types, this paper offers the volcanic framework parameters of each lithology by means of core analysis data, conventional well logging curves and elemental capture spectroscopy (ECS) logs, as well as cross?plot and multiple regression analysis, and then calculates the reservoir’s porosity, based on the accuracy of the porosity, verifies and finally determines the volcanic framework parameters of Nanpu 5th structure, laying foundation for the volcanic reservoir evaluation in this area Related Articles | Metrics

Characterization Method for Coalbed Specific Surface Area YU Tingxu1, TANG Dazhen2, FANG Yuan3, WANG Lei2, ZHU Wuquan2 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160118 Abstract ( 130 )   PDF (300KB) ( 229 )   Save Taking Hancheng coal mining area in Ordos basin as an example, this paper presents the isothermal adsorption experiment of N2 and CO2 to make proper characterization of coalbed specific surface area. The correlation analysis between Langmuir volume from coalbed methane isothermal adsorption and specific surface area from N2/CO2 gas adsorption indicates a positive correlation between coalbed methane adsorption capacity and CO2 SD?R, and a weak correlation between coalbed methane adsorption capacity and N2 SBET. According to the coalbed CO2 adsorption data, coalbed contains a great number of micropores with diameter of 0.5~1.0 nm by DET model calculation approach, while for N2 adsorption data, it has poor effective micropores, which shows that CO2 SD?R is more representative of the coalbed adsorption capacity than N2 SBET. So the coalbed is characterized by more developed micropores and they control adsorption capacity. It is suggested that the coalbed specific surface area should be characterized by CO2 SD?R Related Articles | Metrics

Research on Oil Displacement Mechanism of Crosslinked Polymer Using CT Technique ZHENG Bo1a2HOU Jirui1a2ZHANG Man1bSONG Zhaojie1a2WANG Nan1a2 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160119 Abstract ( 107 )   PDF (300KB) ( 420 )   Save In order to further clear the migration feature of crosslinked polymer flooding in the core，analyzing thoroughly its flooding mechanism，taking a natural core from an oilfield as research object，the crosslinked polymer flooding experiment was made using computed tomography（CT）technique，the tracking scanning of the process of crosslinked polymer flooding was used for rebuilding the pore structure of dry core and migration feature images of crosslinked polymer at different displacement time and different locations in the core. Experi?ment results show that CT technique can be used for study of the migration feature of crosslinked polymer，the porosity calculated by the CT is very accurate，the relative error is only 0.93% compared with the measured value; the displacement front of crosslinked polymer in a strong heterogeneity core is still close to the piston，and the injection pressure is increasing for the initial time and then holding steady，indicating that crosslinked polymer can be used for expanding swept volume effectively，and improving microscopic oil displacement efficiency Related Articles | Metrics

Application of Well Logs Prediction Method for Organic Carbon Content in Biyang Sag,Nanxiang Basin SHANG Fei1, LIU Zhengjun2, XIE Xinong1 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160120 Abstract ( 105 )   PDF (300KB) ( 687 )   Save Taking the shale layer of the third member of Hetaoyuan formation in Biyang sag of Nanxiang basin as an example, the organic carbon contents from 5 wells were predicted by means of improved methods of ΔlogR, CARBOLOG and multivariate regression analysis,and then the predicted results were compared with the limited core analysis data. The results show that the multivariate regression analysis is the best among these three methods in predicting accuracy and applicability, by which the well logs or related categories that well reflect the variation of organic carbon content can be selected, such as neutron log, etc., also, some log data that are influenced by special minerals can be avoided for the reason that high content of pyrite in shale may lead to lower resistivity and higher density, which may weaken the responses to the organic matter for these logs, hence increasing the objectivity and reliability of the predicted results Related Articles | Metrics

Application of Cloud Transform to Prediction of H Oilfield Carbonate Reservoirs in Middle East CHEN Zhigang1,2, LIU Leisong2, GAO Jun2, DAI Shuanghe2, YANG Yu2, HAN Yuchun2 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160121 Abstract ( 76 )   PDF (300KB) ( 173 )   Save The well production of H oilfield in Middle East is positive correlation with the reservoir permeability, but the seismic wave impedance is of nonlinear relationship with the permeability. So using regular linear transform approach to convert the impedance into the permeability is only 50% in accordance rate. Cloud transform is a nonlinear stochastic simulation method, by which the functional relationship between linear deviation points and overall attribute data can be resolved. The procedures are as follows: 1) Select probability function according to the accordance rate between real data probability distribution and simulation prediction results by the function; 2) develop the cloud model for impedance?permeability conversion using the function; 3) convert the impedance into the permeability by using the cloud model. Through the cloud transform, the accordance rate for permeability prediction of H oilfield can reach more than 90%, and this method could be applied to other areas with similar geology conditions Related Articles | Metrics

A Review of HighResolution Seismic Data Processing Approaches CAO Siyuan, YUAN Dian 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160122 Abstract ( 467 )   PDF (300KB) ( 219 )   Save Resolution of seismic data is an important factor of constraining seismic prospecting precision, while high?resolution seismic data processing aims to properly recover high and low frequency spectrum information from seismic records and effectively broaden the bandwidth or frequency spectrum. The conventional approaches to get them are applied as follows: Deconvolution approach is based on seismic convolution model, which requires various assumptions of seismic wavelet, reflection coefficient, stratigraphic occurrence and excitation?receiving pattern; inverse Q filtering approach supported by mechanism of seismic attenuation can compensate and correct amplitude attenuation and phase distortion caused by earth filtering, which depends on the precision of Q estimation and the match degree between model and actual data; frequency recovery approach based on time?frequency spectrum allows to rational estimation of unsteady state wavelet’s amplitude and phase. All in all, these approaches aim to broaden the bandwidth in nature, thus resulting in two changes in seismic profile during high?resolution processing: one is most events become thinner and incremental (due to shorter wavelength); the other is some events become weaker or even disappear (due to smaller side lobes of wavelet). Compared to high frequency component, low frequency component has greater effect on enhancing seismic profile’s layering and improving inverse accuracy, and its recovery is much more difficult. Hence the low frequency component information should be paid more attention to in protection and recovery during such a processing in the future Related Articles | Metrics

Formation and Evolution of Fergana Basin and Its Controlling Effect on Hydrocarbon Accumulation LIU Zhen, WANG Peng, ZHANG Hongmei, LIANG Quansheng, CANG Hui, LIU Ying 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160123 Abstract ( 154 )   PDF (300KB) ( 425 )   Save This paper analyzed the drilling, coring and geophysical data from Fergana basin, studied the relationship between Tianshan orogenic belt activities and Fergana basin formation and evolution, combined with the previous regional geology recognitions, illustrated the controlling effect of its formation and evolution on hydrocarbon accumulation, and discussed the geodynamic setting influencing this basin抯 formation and evolution. It is recognized that the formation and evolution of Fergana basin are closely related to Tianshan orogenic belt and Pamir massif activity, the Talas-Fergana fault in northeastern margin of Fergana basin has an important restrictive function on formation, evolution and sedimentary distribution of the basin; this basin experiences six stages in evolution: the intermountain depression (P2-T1), the tectonic uplift (P2), the prototype basin formation (J1-J2), the tectonic uplift (J3-K1), the continuous subsidence (K2-E), and the tectonic uplift (N-Q); the source, reservoir and cap rocks are formed in the tectonic quiet period, and the petroleum migration and hydrocarbon accumulation occur in the tectonic active period in Fergana basin Related Articles | Metrics

Shale Gas Identification Based on Multi-Scale and Absorption Attributes of Seismic Wave XU Tianji1a,1b, CAO Lun2b,3, CHENG Bingjie2a,3, YAN Lili2b, TANG Jianming1b,1c 2016, 37 (1):  1-1.  doi: 10.7657/XJPG20160108 Abstract ( 86 )   PDF (300KB) ( 363 )   Save On the basis of continuous wavelet transform of seismic signals, this paper describes the energy attenuation abnormal phenomena caused by seismic wave propagation in gaseous high?quality shales using multi?scale absorption attributes, by which the new shale gas identification approach is presented and verified by theoretical analysis and model experiment in terms of scientificity and effectiveness.The case study of the shale gas identification of Qiongzhusi formation in Jingyan?Qianwei area shows that the applied result is closed to the real drilling data Related Articles | Metrics