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01 August 2001, Volume 22 Issue 4 Previous Issue    Next Issue

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Tectonic Evolution of Mesozoic Basins on the Northwest Pacific Margin and the North Tethys Margin(I) XU Jun-yuan, ZHANG Lin-yun 2001, 22 (4):  275-279.  Abstract ( 82 )   PDF (419KB) ( 314 )   Save Tectonic evolution of Mesozoic basins on the northwest Pacific margin and north Tethys margin can be divided into three first-order rifting stages: Early-Middle Triassic, Early-Middle Jurassic and Early-Middle Cretaceous rifting stages, and corresponding post-rifting stages for the other times. Pulse movements happened episodically between these stages. The basins in northwest Pacific margin and north Tethys margin episodically rifted from dextral pull-apart and from extension respectively, on basis of their tectonic styles. Such dextral pull-apart rifts and passive extensional rifts were possibly caused by north drift of Asia continent relative to Pacific plate and north Tethys plate. When Asia continent shifted southward relative to Pacific plate and Tethys plate, while the tectonic movements occurred, the north-west Pacific margin was sinistrally sheared along NNE-NE trending faults and the north Tethys was normally compressed in NE direction. The curve of tectonic strain vs. time was possibly with characteristics of Fractal Geometry. References | Related Articles | Metrics

A Preliminary Analysis of Increasing Character of Oil Reserves in China GUO Yuan-ling, ZONG Guo-hong, ZHAO Le-qiang, GAO Lei, SHI Hong-xia 2001, 22 (4):  280-282.  Abstract ( 104 )   PDF (247KB) ( 329 )   Save This paper analyzed the basic character of proven oil reserves, the increasing tendency of oil reserves since 1986, and the peculiar increasing regularity in various basins. It indicates that the oil resources base determines the increasing scale and increasing rate. Different types of basins showed peculiar characters of reserves increasement and its own reserves increasing regularity. Because of the relatively low proven reserves ratio at the time being in China, it is considered that China nowadays is in relative high increasing-rate period. Along with the continuing investments in West China and offshore basins, the oil reserves will step into a new peak period of proven oil reserves increasement. References | Related Articles | Metrics

Petroleum Exploration Progress Made During the Ninth Five-Y ear Plan Period and Exploration Orientation for the Tenth Five-Year Plan Period in Junggar Basin WANG Yi-lin, JIANG Jian-heng, ZHANG Yi-jie, WANG Xu-long, ZHANG Nian-fu, KUANG Li-chun, YAN Qi-sheng 2001, 22 (4):  284-286.  Abstract ( 0 )   PDF (232KB) ([an error occurred while processing this directive])   Save During the "Ninth Five-Year Plan" period, there are significant exploratory results showed by a series of new discoveries, including two petroleum accumulation belts of Mobei and Sangequan, discovering and developing three gasfields of Sha nan,Shinan and Hutubi,which made are historic breakthrough in exploration of northern Tianshan mountain front area. Based on such exploration results and Geological knowledge,this paper suggested conceptions of compound petroleum system and richening petroleum system, established two exploration patterns suited to Luliang up-lift area and the central depression area respectively, namely paying attention to their own peculiar migration and accumulation patterns, corresponding to former off oil-source, along ridge, faults controlled, step shape occurrence, and latter deep source origin, migration and accumulation into shallower zones. It is pointed out that the exploration strategy for Xinjiang Oilfield Company during the Tenth Five-Y ear Plan period should be summarized as “Focusing on wildcat, discovery, optimum drilling programming, to obtain best benefit” Strategically this has to be carried out the procedure in three steps: deployment, breakthrough and allround standby action. The important targets regions are the inherent positive tectonic elements and their slope areas of three compound petroleum systems: Mahu-Well Pen 1 west, Changji and Dongdaohaizi-Dajing. The first important target formations are Cretaceous, Jurassic and lower Tertiary, with paying attention to Carboniferous-Triassic as well as the exploration of deep-buried giant structures. References | Related Articles | Metrics

Comparative Analysis on Natural Gas Reservoir-Formed Conditions Between South Margin of Junggar Basin and Kuche Depression of Tarim Basin KUANG Jun, LIU De-guang 2001, 22 (4):  287-290.  Abstract ( 95 )   PDF (338KB) ( 262 )   Save Comparative analysis on natural gas reservoir-forming condition demonstrated that their common points are both of them have sufficient gas source supplies, existing numerous fold anticline structures, developing effective regional cap bed. However, the differences between them are that in Kuche depression, reservoir is in favorable quality, hydrocarbon-source-connecting faults developed much better, and existed better preservation conditions. The paper also presents the natural gas exploration orientation and the initial problems to be solved first. References | Related Articles | Metrics

Favorable Geological Conditions for Gas-Pool Exploration in Jurassic Deep-Buried Basin Structure of Junggar Basin CHEN ZHONG-MIN 2001, 22 (4):  291-293.  Abstract ( 78 )   PDF (196KB) ( 218 )   Save In Junggar basin, deep-buried basin structures are consisted of margin frontal depression and large scale of slope structure. Continental facies mud-sandstone developed in Jurassic, thus forming source-reservoir assemblage, and the wide-spreading, and developing tight sandstone reservoir body has formed in large scale delta system. The major gas-source rocks in deep-buried basin structure gas reservoir are coal-bearing systems, with spreading in wide area. They are rich in organics, commonly in mature-and over-matured stages. The formation, migration and accumulation commence from Jurassic and continue all the way through to the time being. They are dominated with abnormal high pressure, possess favorable geological conditions needed for formation of deep-buried basin structured gas-pools. The paper indicated the favorable explorations are in three directions: south margin, Maqiao arch, Dabasong arch, and their slope area. The predicted proven geological reserves will be 1.5×1012 m3(OOIP). References | Related Articles | Metrics

Characteristics and Exploration Potential of Imbricated Oil-Pools—an example from Xinzhuang oilfield XING Wei-xing, WANG Run-hao, FENG Cai-qin, DONG Yu-an 2001, 22 (4):  294-296.  Abstract ( 147 )   PDF (202KB) ( 211 )   Save Through comprehensive analysis of geological data from Xinzhuang oilfield and the studies made in about two years of exploration and development practices, the paper sums up the basic characteristics of imbricated oil- pools are as follows: namely, the occurrence of such pay zones shows as roof-like relation with fault in section and imbricate overlapping in plane view, such oil-pools distribute as narrow stripes along the trend of faults, such pay zones often distribute at high position below the fault point of major fault, and, under such pay zones,there always occurs a set of continuously appearing oil-gas-show sections. The paper proved the imbricated oil-pools are the general occurrence in Xinzhuang oilfield, indicated their rolling exploration and development potentials,and prospecting direction. Meanwhile, combined with such oil-pools features accompanying technical problems to be solved are discussed. References | Related Articles | Metrics

The Improving Method of Synthetic Seismogram and Their Application in Seismic Facies Correction LI Jing, CHEN Yu-ming, TANG Xiang-rong 2001, 22 (4):  297-299.  Abstract ( 68 )   PDF (262KB) ( 255 )   Save Based on detailed discussion of improving method of synthetic seismogram, an improved processing method and processing procedure are suggested. ① Before making the synthetic seismogram, the basis correction of well-logging data, drilling data seismic data, and acoustic correction should be made firstly. ② Calculation of re flection coefficient by adopting non-uniform algorithm is carried out.③ Adapting the wavelet of frequency variation theory, its frequency must be determined by actual seismic channel number nearby the well. ④ Synthetic seismogram must be calculated by inversion method. ⑤ carrying out moveout correction of synthetic seismogram. Actual data have shown that the synthetic seismogram calculated by mentioned improved method is very closed with match the actual seismic records, and can be used for accurately correlating the seismic geologic horizons. References | Related Articles | Metrics

Identification and Suppression of Multiple Wave in Bachu-Dongnong Area in Tarim Basin WEI Feng-ying, SHI Miao-jun, WANG Kai 2001, 22 (4):  300-302.  Abstract ( 79 )   PDF (243KB) ( 199 )   Save Due to the seismic multiple wave and conversion wave are well developed in Bachu-Dongnong area, it has obviously influenced the quality of processed data. The paper proposed the routine used method for multiple wave identification, the τ-P domain automatic identification method, and combination method of normal modeling calculation with explanation to identify the multiple wave. Also, a set of multiple wave suppression processing procedures suited to that particular area is presented. Practical application showed the results are good enough. References | Related Articles | Metrics

Study of Depositional Microfacies of Upper Karamay Formation in the District No.8 of Karamay Oilfield WU Shao-bo, TAN Cheng-qian, SONG Zi-qi, QIN Jian-hua, DAI Can-xing 2001, 22 (4):  303-305.  Abstract ( 110 )   PDF (222KB) ( 204 )   Save By means of the analysis for various facies markers, this article discussed the sedimentary facies type, microfacies buildups and their characteristics of Upper Karamay formation reservoir in the District No.8 of Karamay oil-field, based on core analysis, logging and production dynamic data. It is considered that the Upper Karamay formation in this area belongs to fan-delta sediments, which was formed by alluvial fan or braided stream directly entering lacustrine. The lower segment (S1 sandstone layer) is fan-deltaic deposits. A series of microfacies types have been differentiated, such as subaqueous distributary channel,inter-channel bottom land, channel-mouth bar, sheet sand and braided distributary channel, etc. On the basis of substrata division and vertical evolutionary conditions of the 10 substrata, 19 single sand-layers from S5-S1 have been analyzed. References | Related Articles | Metrics

Characteristics of Low-Resistivity Oil-Gas Zones in Western Taibei Sag of Turpan-Hami Basin GAO Cheng-quan 2001, 22 (4):  306-308.  Abstract ( 108 )   PDF (170KB) ( 232 )   Save Various types of oil-gas reservoirs occur in Turpan-Hami basin, with complicated features of response display of oil-gas beds. There are high resistivity aqueous stratum, low resistivity oil-gas stratum, and normal high resistivity oil-gas stratum in the same time. As the electric response of low resistivity oil-gas stratum showing a little difference with their surrounding beds and aquifer bed, it is hard to be identified, tending to be overlooked and ignored. In recent years by reinvestigation of old wells situated in west Taibei depression, a number of low resistivity oil-gas beds has not only been discovered, but also the relative matured techniques for such identification established. The paper systematically summarized the peculiar response of low resisitivity oil-gas beds,physical mechanism and well- logging data evaluation method, which have constructive meaning for explanation and evaluation of such type oil-gas beds. References | Related Articles | Metrics

Gas-Oil Accumulation and Depositional Microfacies Characteristics of Sanjianfang Formation in Shengquan Oilfield of Turpan-Hami Basin LUO Quan-sheng 2001, 22 (4):  309-312.  Abstract ( 127 )   PDF (362KB) ( 316 )   Save As the major reservoir in Shengquan oilfield, the Sanjianfang formation has characteristics which are very important to its rolling exploration and development. The study shows that: ① the Sanjianfang formation reservoir in Middle Jurassic is a set of coarse grain detrital sediment, belongs to river-shallows lake beach depositional system with braided river delta facies;② it can be further divided into the distributary channel, channel bar, levee (beach), crevasse-splay, subaqueous distributary channel, sheet bar, plain, and frontal sediment of braided stream sedimentary subfacies. ③ different sedimentary microfacies showed obvious different reservoir lithophysical properties and oil-bearing capabilities. Reservoirs of braided channel, channel bar, subaqueous braided channel microfacies have quite good lithophysical properties, they are favorable facies belt for oil-gas accumulation, while those of the overbar, levee(beach) and sheet sand are relatively poor. References | Related Articles | Metrics

Pore Structure Characteristics of Upper-Middle Triassic Reservoir of Machangnan Area in Turpan-Hami Basin ZHANG Li-qiang, JI You-liang, YAN Yu-kui, XIAO Guo-ping 2001, 22 (4):  313-315.  Abstract ( 74 )   PDF (196KB) ( 223 )   Save Based on studies of pore cast thin section, electric scanning microscope, image analysis and mercury injection test of Triassic reservoir of Machangnan area in Turpan-Hami basin, the paper indicates that the pore structure characteristics of reservoirs in this area are not good. They were sorted into four classes. The predominant type of pore structure is middle pore-low permeability-tiny throat. In this area, pore is relatively small, throats are badly sorted, along with capillary curves showing no platform. The influence factors of reservoir are the content of cement and solution. References | Related Articles | Metrics

Depositional Environment in Late Carboniferous-Early Permian in Southern Hetian Area of Southwest Tarim Basin LIU Ning, ZHANG Hai-feng, XIU Shen-cheng, QI Xun 2001, 22 (4):  316-319.  Abstract ( 96 )   PDF (321KB) ( 246 )   Save Depositional environment study has been conducted based on comprehensive analysis for each formation of Late Carboniferous-Early Permian in southern Hetian area of southwest Tarim basin, including their lithology, sedimentary structure, paleobiology, element geochemistry and other sedimentary facies markers. The Late Carboniferous-Early Permian may be divided into two depositional periods, namely, the early subperiod and late subperiod, with their related sedimentary patterns. Then, on such basis, the evolutionary history of Carboniferous-Permian sediments in that area has been analyzed. References | Related Articles | Metrics

Derivation and Application of A New Water displacement Curve Equation LI Fa-yin, JIANG Xin-min 2001, 22 (4):  320-322.  Abstract ( 84 )   PDF (186KB) ( 223 )   Save Aimed at solving the problems of semi-logrithm relationship of cumulating water output and oil output, as well as the problems for applying the Sypachev's equation, this paper based on formula fw=1/(1+μw Kr0/μ0Krw), which is usied to calculate oilfield's composite water cut, through theory derivation, recommended a new equation, Np=A2+[(A0+A1A2)/(Lp-A1)], for waterflooding characteristics curve description. Application instances have demonstrated and verified that it is applicable. References | Related Articles | Metrics

Growth Curve of Factor Type to Predict Oilfield Development Indexes YU QI-tai, LUO Hong 2001, 22 (4):  323-324.  Abstract ( 92 )   PDF (198KB) ( 151 )   Save In terms of definition of growth curve used for predicting oilfield development indexes, a new growth curve of (tb+ct) factor type is proposed, and the calculating formula of corresponding output Q; is derived in this paper. The study showed that the maximum variation range for (Np/NRmax)or m is 0~0.5450, which indicates its peak output may appear in a bit later of middle stage of development,so it agrees with the output variation regularities for absolute most of oilfields. It's Qt vs Np curve could be concave upward or downward during the middle stage's later time. It has four un-determined coefficients, so it is more flexible in using for output variation description. The application instance of Qingzhuji oilfield shows that the calculated curves accords with actual values very well. These all showed the proposed growth curve is very strong functional one in prediction. References | Related Articles | Metrics

On Pore Throat Parameters Calculation of Extra-Low Porosity and Extra-Low Permeability Reservoir LI Guo-nian, LIANG Qin 2001, 22 (4):  325-327.  Abstract ( 62 )   PDF (188KB) ( 236 )   Save Based on experimental data, this paper presents ex isting problems of parameters calculation for diameter average values of pore and throat and others, when determining the capillary pressure by mercury injection. It is demon-strated that w here the trouble lies are: adopting units for calculation without unitarity, disagreed understanding for the constant 100 of denominator used in formula and that the micro pore and throat that cannot be measured are neglected. Through caleulation of example, reasonable method for solution of such problems using φ value and maximum mercury injection rate is pointed out to conduct the relat ed calculations. References | Related Articles | Metrics

Sweep Performance Analysis of the Block Wen No.5 in Turpan-Hami Basin LIANG Qin, LI Guo-nian, DU Jin-hong 2001, 22 (4):  328-329.  Abstract ( 92 )   PDF (133KB) ( 273 )   Save Sweep volume is one of important index in description of oilfield development, and its evaluation of cal-culation may be used as guide for oilfield development regulatory measures. The Block Wen No.5 is one of high-eff-ciency development block of Turpan-Hami oilfield. As the oilfield has entered the middle w ater- cut stage, the produc-tion decline amplitude has increased. So it is necessary to find out succeed output stabilizing measurement, and to tap the production potential further. This paper conducted calculation of current sweep performance by three methods, and predicted the maximum swept volume. References | Related Articles | Metrics

Study on Plug Steam Flooding Techniquefor Heavy Oil Reservoir WANG Zhuo-fei, HUANG Jing-long, WANG Li-xing, HE Xin 2001, 22 (4):  330-332.  Abstract ( 69 )   PDF (156KB) ( 263 )   Save With respect to current situation of heavy oil steam- flooding development and characteristics of the reservoir, adopting laboratory physical simulation technique and numerical simulation technique, and applying mechanisms of intermittent flooding, nitrogen plug steam flooding and active agent flooding, the comparison of development effects and study of operation manners are made, production and development index of 10 years afterward is predicted, their economy evaluations are conducted. Through field experiment, these results have shown to be as guides for improving current steam flooding operation and increasing oil recovery rate. References | Related Articles | Metrics

Study on Reserve Distribution and Recovery Percent of Heterogeneous Conglomerate Oil-Pools- an example from Upper Karamay formation reservoir in Karamay oilfield SONG Zi-qi, TAN Cheng-qian, LIU Shun-sheng, WU Shao-bo, GAO Xing-jun, QIN Jian-hua, DAI Can-xing, LUO Zhi-xing 2001, 22 (4):  335-337.  Abstract ( 110 )   PDF (159KB) ( 234 )   Save Take the Karamay formation conglomerate oil pool as an example, this paper proposed the determining guide for calculating parameters of highly heterogeneous conglomerate oil pools, and an analysis method of net integrated calculation. Using conglomerate oil pool relating data, including its logging interpretation, sedimentary microfacies, spatial distribution of reservoir parameters and corresponding development dynamic analysis data, the network structural database for reserve calculation of conglomerate oil pools has been established. Again, the oil-in-place, recoverable reserves, residual recoverable reserves and recovery percent of each layer of Upper Karamay formation in that area have been calculated. The paper gives important succeeding pay zones and their production potential horizons for production stabilization in oilfield development,such providing corresponding geological basement to improve the effect of oilfield development. References | Related Articles | Metrics

Application of the “Discovery ”Software in Reservoir Description of the District No.4 of Karamay Oilfield SUN Xiao-gang, XIE Hong-wei, CHEN Si-lin, ZOU Lu xin, GUAN Hong-bin, HAN Ming-yi, ZHAO Bin 2001, 22 (4):  338-339.  Abstract ( 104 )   PDF (160KB) ( 193 )   Save The “ Discovery” software was imported from U.S.A. It is an integrate reservoir description software package on the basis of microcomputer platform, with comprehensive functions as seismic data fine description, multiple well logging interpretation, reservoir prediction and geology study, etc.. Using that software package to fine description of the Karamay formation in the District No.4 reservoir,expected results were obtained, providing reference basis for rolling development of the oilfield. References | Related Articles | Metrics

Application of Artificial Neural Networks to Reservoirs Parameters Prediction HU Xiang-yang, XIONG Qi-hua, WANG Zhi-zhang 2001, 22 (4):  340-341.  Abstract ( 79 )   PDF (147KB) ( 213 )   Save The conventional method for prediction of well logging reservoir parameters based on experimental mod-els and statistical models shows lower accuracy and lower successful rate. The artificial neural network is a non-liner dynamic system. It has well prospect in logging interpretation and reservoir parameters prediction. This paper provides a case to illustrate the adv antage of the artificial neural network technique in logging porosity parameters prediction. References | Related Articles | Metrics

The Application of Fractal Theory in Lateral Prediction of Reservoir and Hydrocarbon Diagenesis SUI Shao-qiang, SONG Li-hong, LI Shu-min 2001, 22 (4):  342-344.  Abstract ( 77 )   PDF (236KB) ( 373 )   Save The complicated phenomena of geology have the characteristics of internal self-similarity, so the fractal theory could be applied in them for quantitative prediction. By establishing the theoretic model and calculating three kinds of dimensional numbers,the fractal theory have been used for reservoir prediction and hydrocarbon diagenesis. Through applied examples analysis, it is indicated that the fractal dimension technique can accurately display the characteristics of seismic waves and the variation of reservoir itself and it is a good method for reservoir prediction and hydrocarbon di agenesis. References | Related Articles | Metrics

New Progress of Petroleum Geological Theory, Technique, Method and Their Application in Petroleum Exploration and Development YUAN Ming-sheng, ZHANG Chao-fu 2001, 22 (4):  345-350.  Abstract ( 90 )   PDF (249KB) ( 466 )   Save In recent years, the world's petroleum industry has been developing at full speed, the scope of petroleum exploration and development continuously expanding, dealing with more and much complicated objects, overcome numerous difficulties and have obtained significant breakthroughs. All of them have to attribute to the role played by progress of petroleum geological theories. New theories, new techniques and new methods are continuously developing and being applied,which inject new vitality and energy into world's petroleum industry. Together with the progress of science and technology, the world's petroleum industry in the 21st century will be developing further. References | Related Articles | Metrics

On Petroleum Geological Investigations Conducted in Xinjiang by Geologists of Former Russia and Soviet Union Before 1949 A.D. WANG Lian-fang 2001, 22 (4):  351-353.  Abstract ( 122 )   PDF (170KB) ( 195 )   Save Beginning from the second decade of 19th century, there were some Russian geologists,either dispatched or supported by then Czar 's Russian government, who started geological investigations in Xinjiang. In that early stage, the investigations are most limited in pure geography field, seldom dealing with petroleum geology. During the period from the end of 19th century till the second decade of 20th century,the conducted investigations were basically reconnaissance survey, starting to attach importance to petroleum deposits, and some important oil deposit areas had been described and studied. Among those people, whom he contributed most ought to be then geologist and geographer Obuluchev. During the period of 1935-1943,the Soviet Union's geologists conducted geological reconnaissance survey in Xinjiang, petroleum deposits were placed as one of the key targets, hence accumulating certain amount of related data,then the Dushanzi oilfield was discovered by drilling exploration and put into development. References | Related Articles | Metrics