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01 June 1998, Volume 19 Issue 3 Previous Issue    Next Issue

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FORMATION OF IMMATURE OILFIELD IN JURASSIC COAL-BEARING BASIN IN NORTHWESTERN CHINA Hu Sherong 1998, 19 (3):  187-191.  Abstract ( 77 )   PDF (230KB) ( 231 )   Save Based on the coal petrology of immature oil and the hydrocarbon-generation experiments with peat, coal and mudstone in coal-bearing series, it is pointed out that absorption of clay minerals and micro-pore in coal controls formation, expulsion and migration of coal-formed oil.The maceral of Jurassic coal in northwestern China is composed of matrix vitrinite and suberinite.It is quite difficult to form the sized oilfield but may be discovered in some depressions with developed limnetic facies source rock. References | Related Articles | Metrics

HYDROCARBON EXPLORATION AND REMIGRATION IN TARIM BASIN An Zuoxiang 1998, 19 (3):  192-195.  Abstract ( 96 )   PDF (170KB) ( 204 )   Save Rich results in hydrocarbon exploration have been obtained in Tarim basin, while the difficulties in petroleum geology theory guiding exploration practice are encountered at present.Successful oil/gas exploration theories in eastern China failed in Tarim basin.During development of new theory, oil and gas remigration theory demonstrated by the author in recent years played a central role in reservoir formation(including oil/ gas generation, migration and accumulation).It reflected the characteristics of polycyclic tectonic evolution in China, accorded with enrichment of fluid mineral product such as oil and gas.Therefore it is a key to solving hydrocarbon exploration difficulty in Tarim basin at present. References | Related Articles | Metrics

HYDROCARBON POTENTIAL IN THE DEEP TAIBEI SAG IN TURPAN-HAMI BASIN Zhang Daisheng 1998, 19 (3):  196-201.  Abstract ( 75 )   PDF (284KB) ( 155 )   Save Permian and Triassic source rocks have large thickness, stable distribution and better hydrocarbon-generation condition in Taibei sag of Turpan-Hami basin.Three sets of source-reservoir-cap assemblages are developed in Taibei sag, in which the combination of Upper Permian as source rock and Mid-Upper Triassic as reservoi r is the most favourable one, braided river delta sandbody in the south is dominant in reservoir type;two sets of local reservoircap assemblages occur in the Lower Jurassic, the distribution of thei r traps coincides with Permian and Triassic traps.Comprehensive evaluation considered that Shanshan arc-like belt, Honglian area, Pubei and northern piedmont belts are favourable one for deep hydrocarbon exploration in Taibei sag. References | Related Articles | Metrics

EVALUATION OF HYDROCARBON PRESERVATION CONDITIONS IN FUXIN BASIN Wang Weifeng, Lu Shikuo, Xie Xiangyang, Guo Yuxin, Sun Yuping 1998, 19 (3):  202-206.  Abstract ( 154 )   PDF (214KB) ( 229 )   Save Based on the study on tectonic evolution history of Fuxin basin, along with qualitative and quantitative analysis of the confining history of fault, uplifting and denudation of structure, magmatic activity, mobility of ground water, sealing capability of caprock and oil-bounded fault after oil/gas entrapment, the preservation conditions of oil/gas reservoir in Fuxin basin are investigated with fuzzy evaluation method, and the basic content and method for studying preservation conditions of oil/gas reservoir in the fault-depression discussed. References | Related Articles | Metrics

RESERVOIR-FORMING REGULARITY IN CARBONIFEROUS IN BASHITUOPU ANTICLINE Li Yuguan, Deng Xingliang, Tursunjan 1998, 19 (3):  207-209.  Abstract ( 68 )   PDF (164KB) ( 163 )   Save Bashituopu litho-structural reservoir formed in Late Carboniferous-Early Permian, in which hydrocarbon distribution was completely controlled by paleostructure.Owing to tectonic movement in Late Cenozoic, Bashituopu paleoanticline evolved into a nose-like structure dipping west, but oil and gas in bioclastic limistone didn't completely lose because of severe heterogeneity and uncommunication in limistone reservoir.Bashituopu paleoanticline, to the east of Well Qun 4, still contains large amount of unproved reserves.It is a very favourable exploration area. References | Related Articles | Metrics

COMPOSITIONAL CHARACTERISTICS OF OILFIELD WATER FROM LUNTAI FAULT-UPLIFT IN TARIM BASIN AND ITS SIGNIFICANCE Zhang Min, Zhang Jun 1998, 19 (3):  210-212.  Abstract ( 173 )   PDF (158KB) ( 363 )   Save Luntai fault-uplift is so far the proven largest terrestrial oil and gas accumulation zones in Tarim basin.A study on chemical composition of produced water from 4 oilfields in Luntai fault-uplift(Yingmaili, Hongqi, Yaha and Tirigeng)showed that they are highly variable in different areas and layers.The salinity and Cl- concentration in Tertiary References | Related Articles | Metrics

GEOLOGIC SIGNIFICANCE OF ILLITE CRYSTALLINITY IN TERTIARY MUDSTONE, TARIM BASIN Wang Xingxin, Wang Shaoyi 1998, 19 (3):  213-217.  Abstract ( 124 )   PDF (254KB) ( 283 )   Save The Tertiary in Tarim basin is in the early diagenesis stage.The illite crystallinity in Tertiary mudstone remains the same as the anchi-metamorphic source rock in orogenic belt in the periphery, and becomes better from bottom to top.The vertical illite crystallinity variation remarkably divides into two stages, just consistent with the first and second episodes during the elevation stage of Himalayan movement, which reflects the rapid sedimentary characteristics of continuous uplift and denudation of orogenic belt.It is believed that rapid uplifting, denudation, accumulation, and low diagenetic degree are necessary to allow the structural features of anchi-metamorphic illites preserved, and also the most important control on the compositional characteristics of clay mineral in mudstone. References | Related Articles | Metrics

SEDIMENTARY ENVIRONMENT OF UPPER PERMIAN LUCAOGOU FORMATION IN AIWEIERGOU AREA IN TURPAN-HAMI BASIN Li Wenhou 1998, 19 (3):  218-220.  Abstract ( 77 )   PDF (166KB) ( 150 )   Save On the basis of lithology, sedimentary structure, fossils and geochemical markers, this paper systematically analyzed the sedimentary environment of Upper Permian Lucaogou formation in Aiweiergou area.Near-shore turbidite fan and typical turbidite rock are deposited on well-developed deep-lake facies sediments in this area.The deep-lake facies dark mudstone, shale and oil shale are better source rock, and the overlying Mid-Upper Triassic Xiaoquangou group is the favourable reservoir.All these support that there is higher hydrocarbon potential below Jurassic in the depression of southern Turpan-Hami basin. References | Related Articles | Metrics

LOWERORDOVICIAN CRYPTO-ALGAEORGANIC REEF IN WELL TZ5 IN TARIMBASIN Kong Jinping, Liu Xiaozeng 1998, 19 (3):  221-224.  Abstract ( 114 )   PDF (222KB) ( 243 )   Save The Lower Ordovician in Tazhong area is dominated by marine carbonate.The Lower Ordovician penetrated by Well TZ5 can be divided into four lithologic members, i.e.limestone, brecciated dolomite, upper and lower dolomite, among which the brecciated dolomite member is a crypto-algae reef composed of stromatolite, lamellar stone, oncolite etc formed by crypto-algae bonding, stromatolite has wave-resistant structure.The crypto-algae organic reef underwent one reef base forming stage, three reef growing stages and two intermission, fore reef and reef-core subfacies alternatively appeared in the reef growing stage.Active oil/gas show in drilling indicates that the crypto-algae organic reef has fair storage capability. References | Related Articles | Metrics

DISTRIBUTION OF THE FRACTURE IN LOW-PERMEABILITY SANDSTONE RESERVOIR IN ZHANGBEI AREA, EASTERN JUNGGAR BASIN Zeng Lianbo, Li Xinbing 1998, 19 (3):  225-227.  Abstract ( 71 )   PDF (181KB) ( 179 )   Save This paper studied the distribution of the fracture in low-permeability sandstone reservoir in Zhangpenggou area, eastern Junggar basin, and considered that fracture spacing generally has a log-normal distribution, and increases with the formation thickness.There is better linear relationship among the fracture spacing, propagation and height.The fracture was controlled by li thologic facies and structural stress. References | Related Articles | Metrics

FRACTURED RESERVOIR CHARACTERISTICS IN BIANTAI BURIED HILL IN LIAOHE OILFIELD Chen Yuanchun, Wang Guizen, Chen Heping 1998, 19 (3):  228-230.  Abstract ( 94 )   PDF (154KB) ( 272 )   Save The azimuth of fracture growth in fractured reservoir in Biantai buried hill were determined with paleogeomagnetism and dipmeter, the spatial distribution of fracture was studied with fractal method, and porosity and permeability were calculated with volume-density mehtod and Parsons equation.It is suggested that the reservoir in Biantai buried hill is a dual-porosity system dominated by fracture.This finding offered scientific basis for well pattern arrangement and water injection development. References | Related Articles | Metrics

GRAIN SIZE FRACTAL CHARACTERISTICS OF CONGLOMERATE AND ITS APPLICATION IN KARAMAY OILFIELD Liu Shunsheng, Zheng Qiang 1998, 19 (3):  231-232.  Abstract ( 152 )   PDF (132KB) ( 194 )   Save This paper proved that grain size composition of pluvial fan conglomerate has self-similar fractal structure by applying fractal theory.The calculations showed that fractal dimention number of conglomerate is bigger than that of sandstone, and conglomerates with different origins have different fractal dimension numbers.Based on the application of fractal dimension number of grain size composition in sedimentary environment interpretation and reservoir evaluation and case study of conglomerate reservoi r in Karamay oilfileld, it is indicated that the fractal dimension number of grain size composition can reflect the evolution of sedimentary environment, and also establishes linear relationship with sorting coefficient and permeability of rock. References | Related Articles | Metrics

STUDY ON WATER DISPLACEMENT CURVE—the 5th in Series Yu Qitai 1998, 19 (3):  233-236.  Abstract ( 58 )   PDF (194KB) ( 239 )   Save The established 6 relationships of water cut and recovery percent of reserves have been summarized.These relationships were transformed into those between water cut and recovery percent of recoverable reserves, and these curves investigated.Such relationship can reflect different water cut trends, while the use of instant water cut affected the computing accuracy which can be removed by using the culmulative values of oil production, water production, liquid production and water injection rate. References | Related Articles | Metrics

CALCULATIONOF OIL AND GAS GEOLOGIC RESERVES IN THE TRANSITION ZONE WITH BLACK OIL SIMULATOR Miao Zhiwei 1998, 19 (3):  237-240.  Abstract ( 63 )   PDF (182KB) ( 147 )   Save The calculation of fluid saturation in the transition zone is highly related to accurate calculation of oil and gas geologic reserve in oil/water transition zone in heterogeneous low-permeability reservoirs.The distribution of oil saturation is determined by modifying the capillary pressure curves, and oil and gas geologic reserves in transition zone of Triassic(Karamay formation)in Karamay oilfield calculated with the introduced Black Oil model.Compared with the conventional method, this method is more accurate, simpler, and more flexible in layer division. References | Related Articles | Metrics

A SUPPLEMENT TO GENERALIZED DECLINE CURVE CHART Bi Yanbin 1998, 19 (3):  241-243.  Abstract ( 62 )   PDF (156KB) ( 184 )   Save In the light of identification of production decline type in actual production, the useful supplement to the chart of generalized decline curve were made based on the basic theory of production decline.New generalized decline curve equation and chart of standard decline curve type were established, and a simple method for determining initial decline rate from standard chart was presented.Case study shows that this method is more suitable for production decline analyses in oilfield development, and easily understood by reservoir engineers. References | Related Articles | Metrics

NUMERIC SIMULATION OF HORIZONTAL WELL IN THE SUPER VISCOUS OIL RESERVOIR IN BLOCK DU 84, LIAOHEOILFIELD Wang Wei, Zhao Chunmei, Zhang Ying 1998, 19 (3):  244-246.  Abstract ( 83 )   PDF (149KB) ( 193 )   Save Steam injection of super viscous oil reservoir by utilizing a vertical well performed unsatisfactorily in Liaohe oilfield.The use of the newly-developed horizontal well thermal recovery simulator NUMSIP-4 in the investigation of the production performance of horizontal well at different well patterns and recovery methods in Block Du 84 showed that the optimized recovery method is steam assisted gravity drainage, combined with paired horizontal wells with injection from the upper one and production from the lower one, horizontal length of 300 m and injection-production well spacing of 15 m.It may be used in the development of similar reservoir for reference. References | Related Articles | Metrics

AMETHOD FOR CALCULATING HEATING RADIUS IN STEAM STIMULATION OF VISCOUS OIL RESERVOIR Li Chunlan, Cheng Linsong 1998, 19 (3):  247-249.  Abstract ( 84 )   PDF (177KB) ( 275 )   Save The correct determination of heating radius in viscous oil reservoi r is the key to analysing reservoir performance, and the basis for drawing up and adjusting development plan.Based on the flowing coefficient and the calcu- lated front and bottomhole temperatures in heating zone using viscosity-temperature curve equation of crude oil, the equation for calculating the heating radius is established.By relating the heating radius to flowing coefficient, it is suggested heating radius changes with time. References | Related Articles | Metrics

ANALYSES AND IDENTIFICATIONS OF WELL TEST CURVESWITH PHASE SEGRAGATION IN KARAMAY OILFIELD Zhang Jiafu, Liu Suhua 1998, 19 (3):  250-252.  Abstract ( 100 )   PDF (156KB) ( 137 )   Save Some pressure buildup test curves in Karamay oilfield exhibit phase segragation phenomenon to various extent, which therefore distorted the shape of well test curves, and also covered the true properties of formation.If treated improperly, the erroneous conclusion is likely to occur.In order to enable pressure buildup data to correctly evaluate the reservoir, the phase segragation effect was analysed in details.Its forming mechanism was analysed by using actual data, and the corresponding solution obtained. References | Related Articles | Metrics

THE FIRST SINO-FOREIGN JOINT VENTURES IN XINJIANG PETROLEUM HISTORY—Dushanzi Oil Company Chen Yanqi 1998, 19 (3):  253-262.  Abstract ( 230 )   PDF (168KB) ( 313 )   Save Dushanzi oil company was the first Sino-foreign(the former Soviet Union)joint ventures in Xinjiang petroleum industry at the end of 1930s.Because of no official contract or agreement, Chinese didn't obtain the equal position and condign respect. At the beginning of 1940s, owing to complex historical background, both China and the former Soviet Union requsted negotiation and signing official agreement, but due to quite different standpoint, they didn't reach a consensus.Looking back to this period of history, it leads us think more. References | Related Articles | Metrics