Table of Content

01 October 1998, Volume 19 Issue 5 Previous Issue    Next Issue

For Selected:

Download Citations EndNote Reference Manager ProCite BibTeX RefWorks

Toggle Thumbnails

ESTABLISHING THE PRODUCTION BASE OF NATURAL GAS TAKING TARIM BASIN AS MAJOR BASE IN XINJIANG Zhang Kai 1998, 19 (5):  351-356.  Abstract ( 121 )   PDF (252KB) ( 203 )   Save Regarding economy, source of energy and environment as a whole, natural gas will become the fourth generation source of energy instead of crude oil in the twenty-first century.The theory and practice proved that Tarim basin is rich in natural gas, and will become gigantic production base of natural gas together with Junggar, Turpan-Hami, Santanghu, Yili, Yanqi and Zaisang basins.The base construction in Xinjiang may be divided into three stages: oil and gas exploration and development should be paid the same attention from the end of the century to year 2010, with the exploration depth of 3 ~6 km; year 2010 to 2030 will be the stage dominated by exploration and development of natural gas, with the exploration depth of 6~8 km; toward year 2030 to 2050, natural gas will progressively replace crude, with the exploration depth of 8~10 km. At that time, Xinjiang will become the largest production base of natural gas in China. References | Related Articles | Metrics

FORMATION AND DISTRIBUTION OF RESERVOIRS IN TABEI UPLIFT, TARIM BASIN Huang Chuanbo 1998, 19 (5):  357-361.  Abstract ( 136 )   PDF (246KB) ( 212 )   Save Commercial oil/gas flows have been obtained in ten layer series in Tabei uplift of Tarim basin, and four categories, thirteen types of reservoirs have been found.Based on source rock, trap, reservoir-cap assemblage and preservation conditions, formation and evolution of reservoirs were analysed.It is considered that the reservoirs in Tabei uplift are characterized by multiple types, multiple layer series, mutiple reservoir-formed stages, deep burial, small scales and distribution along faults and unconformable surface.Hydrocarbon accumulation in Tabei uplift belt was controlled by regional structure framework, and divided into a marine petroliferous system in south and a continental petroliferous system in north. References | Related Articles | Metrics

LATERAL SEALINGOF MAJOR FAULTS IN CARBONIFEROUS IN TAZHONG AREA Fu Guang, Wang Pengyan, Fu Xiaofei 1998, 19 (5):  362-365.  Abstract ( 82 )   PDF (177KB) ( 177 )   Save Based on the study on features of developed faults in Tazhong area, this paper calculated the mudstone smearing coefficient of major faults in Carboniferous within study area according to the definition of mudstone smearing coefficient. The results showed that the mudstone smearing coefficients of F3, F4 and F5 faults are all less than 4, while that of F2 fault is more than 4, so the distribution continuity of mudstone smearing layers of F3, F4 and F5 faults and their lateral sealing are better than that of F2 fault, thus playing an important role in hydrocarbon accumulation and forming reservoirs of Carboniferous in Tazhong area. References | Related Articles | Metrics

RESERVOIR-FORMED CONDITIONS OF TUYUKE OILFIELD IN TURPAN-HAMI BASIN Huang Zhilong, Leng Shengrong, Yan Liecan 1998, 19 (5):  366-368.  Abstract ( 152 )   PDF (192KB) ( 217 )   Save Tuyuke oilfield consists of deep heavy oil reservoirs with characteristics of high crude density, high viscosity, high bitumen content and low light component, closely related to the reservoir-formed conditions and processes. Based on the analysis of the source rock, reservoir, cap rock, hydrocarbon migration and structural evolution history, it is considered that crude in Tuyuke oilfield is mainly generated from Permian source rock, hydrocarbon generation and expulsion is in Late Triassic-Early Jurassic ; Karamay formation in Middle Triassic is as i ts reservoir ;mudstone with the thickness of 50~170 m in top of Karamay formation is as caprock ;faulted anticline-faulted nose structure formed in Karamay movement of the end of Late Triassic, was reformed and developed by Indo-China movement and early-middle Yanshan movement ;hydrocarbon migration occurred in Late Triassic-Early Jurassic and Late Cretaceous dominated by the former ;and hydrocarbon migration channel is faults in Lukeqin structural belt and high permeabili ty sand layer in Karamay formation. References | Related Articles | Metrics

THE RELATIONSHIP BETWEEN P-AND S-WAVE VELOCITY RATIO, MODULUS OF ELASTICITY AND FLUIDS CONTAINED IN ROCKS Huang Kai, Xu Qunzhou, Yang Xiaohai, Lai Zhongkang, Zhang Lufei 1998, 19 (5):  369-371.  Abstract ( 162 )   PDF (178KB) ( 635 )   Save Based on experimental simulation test of core in western Junggar basin, it is considered that P- and S-wave velocity ratio, Poissons ratio, Youngs modulus and Lames constant of core samples saturated with water are bigger than those of core samples saturated with oil ;while the volume and shear moduluses of core samples saturated with water are smaller than those of core samples saturated with oil.Modulus of elasticity of rock is also related to porosity, the larger the porosity, the smaller the modulus of elasticity, and vice versa.The modulus of elasticity of rock increases or decreases with experimental pressure increasing or decreasing.Above-mentioned characteristics of rock can be basically and possibly used for detection of distribution of oil, gas and water in rock by applying geophysical prospecting data. References | Related Articles | Metrics

HYDROCARBON-GENERATION DYNAMICS CHARACTERISTICS OF KEROGEN IN DIFFERENT SOURCE ROCKS Gao Gang, Hao Shisheng 1998, 19 (5):  372-376.  Abstract ( 101 )   PDF (207KB) ( 318 )   Save The analysis of pyrolytic hydrocarbon-generation dynamics characteristics of Ⅰ or Ⅱ2-Ⅲ1 type of kerogen is made in mudstone and carbonate rock.It shows that the decisive effect on hydrocarbon-generation dynamics with the same lithology is what types of organic matters are, when the type of organic matter is same, lithologies of different source rocks may affect hydrocarbon-generation dynamics characteristics in some degree, especially in the early and late hydrocarbon-generation periods.With different lithologies, the activation energy distribution of same organic matter is relatively similar.The activation energy distribution of Ⅰ type of kerogen ranges narrowly, being 50 837~ 53 828 cal/mol for mudstone and carbonate rock;that of Ⅱ2-Ⅲ1 type of kerogen is wider than that of Ⅰ type of kerogen, and that of mudstone is wider than that of carbonate rock.Finally, according to pyrolysis dynamics characteristics of carbonate rock, a quantitative hydrocarbon-generation calculating model of carbonate source rock section with Ⅰ or Ⅱ2-Ⅲ1 type of kerogen is developed in this paper. References | Related Articles | Metrics

HYDROCARBON-GENERATION SIMULATION TEST OF MAJOR SOURCE ROCK AND ITS SIGNIFICANCE IN JUNGGAR BASIN Wang Yutao 1998, 19 (5):  377-382.  Abstract ( 106 )   PDF (293KB) ( 194 )   Save The thermal simulation tests of major source rock of five hydrocarbon-generation series including eight sets of hydrocarbon-generation layer/formation were made.The results showed that hydrocarbon-generation rate was controlled by kerogenic type and environment of source rock.hydrogen-enriched source rock has high hydrocarbon-generation rate and varied gas-generation rate ;hydrogen-enriched source rock in strong reducing environment can earlier enter oil generation threshold and generate low maturity oil.In addition, thermal fractionation effect occurred in simulated products (liquid and gaseous hydrocarbons)and kerogen with simulated temperature increasing in varying degrees ;evolution law of elements and functional group of kerogen reappeared with simulation test, and moreover, hence revealing hydrocarbon-generation mechanisms of different types of source rocks.Based on these, it is suggested that we should pay high attention to the Lower Cretaceous and Paleogene in west side of piedmont sag in south margin of Junggar basin, in which possess geochemical conditions of generating low maturity oil, in addition to continuing to find primary and secondary reservoi rs associated with Carboniferous-Permian source rock wi thin the basin and to find secondary reservoirs associated with Triassic-Jurassic source rocks in south margin of Junggar basin. References | Related Articles | Metrics

SYSTEM TRACT MODEL IN TERRIGENOUS SEQUENCE OF THE STEEP SLOPE ZONE IN FAULT-DEPRESSED LACUSTRINE BASIN—A Case Study :the Upper Member of Eh3, Shuanghe-Zhaoao, Biyang Fault-depression Hu Shouquan 1998, 19 (5):  383-387.  Abstract ( 80 )   PDF (261KB) ( 268 )   Save Because the depositional shoreline break is difficult to recognize in the steep slope zone of fault-depressed lacustrine basin, it has been put forward that the location of specific wells is taken as reference to divide terrigenous sequence and system tract.A complete terrigenous sequence can be divided into 4 system tracts and has 5 boundaries, of which the top and the bottom belong to sequence boundary, and other 3 to system tract boundary.Low stand System Tract(LST)which bottom is a sequence boundary of type Ⅰ and top is first flooding surface formed during the period from the descent inflexion point(F)to the lowest point(L)of lacustrine level change.Trans gressive Systems Tract(TST)which bottom is a first flooding surface and top is marked by the emergence of condensed section formed during the period from the lowest point(L)to the ascent inflexion point(R)of lacustrine level change.High stand Systems Tract(HST)which bottom is marked by the emergence of condensed section and top is a maximal flooding surface formed during the period from the ascent inflexion point(R)to the highest point(H)of lacustrine level change.And Regressive Systems Tract(RST)which bottom is a maximal flooding surface and top is a sequence boundary of type I or type Ⅱ formed during the period from the highest point(H)to the descent inflexion point(F)of lacustrine level change. References | Related Articles | Metrics

DIAGENETIC MODE AND ITS RELATION TO QUALITY OF CⅠ OIL GROUP RESERVOIR OF CARBONIFEROUS SYSTEM IN TAZHONG UPLIFT Wei Yuanjiang, He Yuanbi, Yang Youyun, Pang Wen 1998, 19 (5):  388-392.  Abstract ( 66 )   PDF (260KB) ( 206 )   Save This paper summarized the diagenetic features of CⅠ oil group quartzose sandstone reservoir of Carboniferous system in Tazhong uplift, such as compaction and pressure solution, cementation, dissolution, alteration and replacement.Five stages of diagenesis were classified, including penecontemporaneous, early diagenetic stage A and B, late diagenetic stage A and telo diagenetic stage B.By analysis of the diagenetic mechanisms, furthermore, diagenetic mode is established.For the first time, it is pointed out that the diagenetic environment in this region was a semi-sealed to sealed system. Factors affecting the diagenesis and their relations to reservoir quality of CⅠ oil group are discussed. References | Related Articles | Metrics

ROCK MECHANICS TEST AND ANALYSIS OF POROSITY PRESERVATION IN DEEP RESERVOIR Cao Yaohua, Zhang Nianfu, Lin Jinfeng, Kuang Jun, Li Wei 1998, 19 (5):  393-396.  Abstract ( 107 )   PDF (155KB) ( 202 )   Save Resultsfrom rock mechanics tests and deep well drilling revealed that after sediments solidified into sedimentary rocks or magma condensed to igneous rocks, if the strata developed with higher porosity by dissolution, then such reservoir rocks can not lose their porosity due to overlaping formation pressure.If there is not large scale of cementation, the higher porosity of the rock can be preserved in the place over 7 000 ~ 8 000m in depth. Therefore, deep and super deep strata can also develop with high-quality oil and gas reservoir spaces. References | Related Articles | Metrics

THE EFFECT OF CLAY MINERAL IN STRATIGRAPHIC CORRELATION AND RESERVOIR STUDY IN TARIM BASIN Sun Yushan, Yang Fan 1998, 19 (5):  397-400.  Abstract ( 95 )   PDF (192KB) ( 239 )   Save According to distribution characteristics and combination forms, evolution and formation mechanism of clay mineral, the application and the effect of clay mineral in stratigraphic correlation and reservoir physical property were discussed.The results revealed that clay minerals and their combination characteristics formed in Jurassic and Cretaceous offered proper evidence for stratigraphic classification and correlation; there is no obvious vertical variation of content of montmorillonite between illite and montmorillonite layer in mudstone ;clay mineral combination dominated by kaolinite and authigenic(illite and montmorillonite interlayer mineral)and sedimentary(illite)clay minerals have distinct effect on physical property of reservoir, and are favourable for preservation of reservoir property. References | Related Articles | Metrics

A PRELIMINARY STUDY ON GRAPTOLITE-BEARING STRATA IN ORDOVICIAN IN WELL TAZHONG 28, TARIM BASIN Zhan Shigao, Zhao Zhixin 1998, 19 (5):  401-402.  Abstract ( 87 )   PDF (114KB) ( 148 )   Save Based on systematic analysis of graptolite fossils from Well Tazhong 28 in Tarim basin, it is considered that geologic time of the graptolite is late period of Middle Ordovician and early period of Late Ordovician, corresponding to middle and late period of Caradoc in western Europe ;graptolite-bearing strata can correlate with strata in Kepin area in northwestern Tarim basin, corresponding to Qilang formation of Middle Ordovician and Yingan formation of Upper Ordovician, respectively. References | Related Articles | Metrics

DEDUCTION OF WNEG'S MODEL FOR WATERCUT PREDICTION Chen Yuanqian 1998, 19 (5):  403-405.  Abstract ( 187 )   PDF (179KB) ( 216 )   Save The late Mr.Weng proposed logistic cycle model in 1984, which can be used to predict watercut and water-oil ratio and widely applied in oilfields. Based on the deduction of Weng' s logistic model in theory, this paper verified the unreasonableness of empirical formula(WOR =be-at/c)presented by John Fisher.Meanwhile, on the basis of field application of it, it is pointed out that Weng's logistic model is applicable to predict watercut and water-oil ratio of oilfields which current water cut is less than 70 %. References | Related Articles | Metrics

PRIMARY PRINCIPLE FOR REASONABLE DEVELOPING ANTICLINAL RESERVOIR WITH EDGE AND BOTTOM WATER —A case study of Sangonghe reservoir in Cainan oilfield Li Xingxun, Shen Nan, Tang Dong, Zhang Tong, Chen Yong, Ji Weimin 1998, 19 (5):  406-409.  Abstract ( 98 )   PDF (212KB) ( 276 )   Save Sangonghe reservoir in Cainan oilfield is characterized by active edge and bottom water, abundant natural energy, good connectivity, high permeability, low oil-water-viscosity ratio and high pressure conductivity coefficient, and quickly-replenished edge and bottom water, suitable for a long-term development with natural energy.According to characteristics of different blocks, this paper discussed how to determine reasonable water injection timing, position and oil recovery rate in order to maximize the utilization of its natural energy. Sangonghe reservoir was developed with oil recovery rate of 2.9 %~ 3.4 %for more than five years, kept stable production of oilfield in low-moderate water cut stage and obtained higher oil recovery and better economic benefit. References | Related Articles | Metrics

EFFECT OF INJECTION-PRODUCTION WELL RATIO ON RECOVERY EFFICIENCY BYWATERFLOOD PROCESS Yang Fengbo 1998, 19 (5):  410-413.  Abstract ( 88 )   PDF (193KB) ( 203 )   Save Based on theoretic study on the relationships among injection-production well ratio of different water injection well patterns, per water injection well unit and well spacing density, the formula was derived for calculating injection-production well ratio, well spacing density and water drive recovery efficiency, further improving the study method of water drive recovery efficiency, and providing a new way to in-depth research it. Furthermore, this method was used to Shuanghe, Xiaermen and Weigang oilfields to quanti tatively analyse the constitution of enhanced recoverable reserves.The results showed that this method is simple and easy to use. References | Related Articles | Metrics

A CORRECTIONAL METHOD FOR FORECASTING PRODUCTION OF OIL/GAS FIELD Jiang Ming, Song Fuxia 1998, 19 (5):  414-416.  Abstract ( 71 )   PDF (153KB) ( 223 )   Save Many methematical models for forecasting production of oil/gas fields have been developed, but they have certain limits.This paper presented a correctional method for forecasting production of them, making up for defects of the models for it. The practices showed that the corrected model has a higher accuracy in forecasting production of oil/gas fields than other models. References | Related Articles | Metrics

DETERMINATION OF STOP FLOWING CONDITION OF GAS CONDENSATE WELL Kang Zhijiang, Li Tong 1998, 19 (5):  417-420.  Abstract ( 77 )   PDF (211KB) ( 201 )   Save Based on limited flowing production calculated by Turner formula, combined with flow in and flow out performance curves, stop flowing conditions were determined including limited flowing flow, fluid pressure and abandonment pressure.This paper offered the essential parameters for determining reasonable productivity and ultimate recovery efficiency of gas condensate field. References | Related Articles | Metrics

APPLICATION OF “CORE CALIBRATION METHOD"IN LOG INTERPRETATION MODEL Zhao Jun, Chen Fuxuan, Yan Jun 1998, 19 (5):  421-423.  Abstract ( 108 )   PDF (152KB) ( 218 )   Save Based on core analysis, quanti tative log interpretation model with“core calibration"wasestablished, which canenhance accuracy of log interpretation, and is significant for reservoir description and oil/gas layer evaluation.This paper presented that depth homing of core analysis data, matching of data and interpretaing, correcting and standardization of log curves should be made before log interpretation model corresponding to physical parameter was established.According to geologic condition of Qiuling oilfield in Turpan-Hami basin, the models for porosity, shaliness and permeability were established based on density, neutron porosity, sonic logging curves and gamma ray and natural gamma ray spectrometry logging curves; the model for oil saturation interpretation of sandstone reservoir established with Archie formula.The practices of these models in Qiuling oilfield were correlated with available oil testing data, with accordance of 91.4 %. References | Related Articles | Metrics

CONVENTIONAL LOG INTERPRETATION OF WATER-OUT ZONE IN WATERFLOODING OILFIELD—An example of Karamay oilfield Zhao Fuzhen, Yang Ruiqi 1998, 19 (5):  424-427.  Abstract ( 128 )   PDF (191KB) ( 237 )   Save When an oil reservoir is watered-out by freshwater and sewage miscible phase in a water flooding oilfield, formation water resistivity of each water-out zone can' t be accurately determined, which resulted in bigger error in log interpretation of water-out zone.An interpretation chart of water saturation (the relationship curve of formula resistivity and water saturation)was presented by applying mathematical statistics, performance testing and establishment of geologic model etc., combined with all production data from development of an oilfield.Verification of the chart was made by using core data from four sealed coring wells in three blocks of Karamay oilfield.It is concluded that the conventional log interpretation of water-out zone can be improved greatly by this method. References | Related Articles | Metrics

REVIEW OF SOURCE ROCK MATURITY EVALUATION BY ORGANIC PETROLOGY METHOD Cheng Dingsheng 1998, 19 (5):  428-432.  Abstract ( 148 )   PDF (206KB) ( 515 )   Save Organic maturity is an important problem in evaluation of source rocks.From the view of the historical retrospects and future prospects of organic petrology, the application effectiveness on evaluating source rock maturity by three optical methods of organic petrology, such as transmitted light, reflected light and fluorescence was elaborated, respectively, and their appropriate range, existed problem and the realm which should be strengthened and deepened to study were pointed out in this paper. References | Related Articles | Metrics