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01 December 1997, Volume 18 Issue 4 Previous Issue    Next Issue

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GEOLOGICAL EXPLORATION

ON AEROMAGNETIC ANOMALY AND RIFT SYSTEM IN NORTHERN XINJIANG Wang Yichang 1997, 18 (4):  295-301.  Abstract ( 119 )   PDF (565KB) ( 315 )   Save Rift system in northem Xinjiang includes Junggar, Turpan-Hami, li basins and some mountainous area among them, with length of 1 200 km in EW direction, width of 400 km in NS direction, the area of 25x 104km2 . These basins are seperated by Tianshan mountains system, but three basins connected by aeromagnetic anomaly map, and fommed a complex“trifurcate” strong magnetic anomaly belt. According to analyses of anomaly characteristics and sedimentary formation, it might be a reflection of Late Paleozoic rift system in northem Xinjiang. References | Related Articles | Metrics

FORMATION, DISTRIBUTION AND PROSPECTING POTENTIAL OF MESOZOIC-CENOZOIC RESERVOIRS IN NORTHERN TARIM BASIN Zhang Ximing, Liu Qingfang, Wang Guiquan, Ye Desheng 1997, 18 (4):  302-306.  Abstract ( 147 )   PDF (419KB) ( 174 )   Save There are better oil and gas reservoir forming conditions in Mesozoic-Cenozoic in northem Tarim basin, Kuqa sag possesses basical petroleum geologic condition for foming giant oil and gas field, and medium-small type of oil and gas feld group may form in the rest area with better assemblage conditions. There are three distribution models in Mesozoic-Cenozoic oil and gas reservoirs. Varieous scales of reservoirs were formed in nine series of Sinian-Neogene, among which 80% are in Mesozoic-Cenozoic (mainly distributed in paleo-uplift and slope belt) . These indicated that there are broad oil and gas prospecting potential in Mesozoic-Cenozoic in Tarim basin. References | Related Articles | Metrics

DISCOVERY OF DICKITE AND ITS SIGNIFICANCE IN WEATHERING CRUST OF LOWER ORDOVICIAN, SOUTHWEST DEPRESSION IN TARIM BASIN Zhao Xingyuan 1997, 18 (4):  307-312.  Abstract ( 128 )   PDF (951KB) ( 211 )   Save Dickite were only found in dolomite denudation pore in weathering crust(Lower Ordovician) in Shaanxi-Gansu-Ningxia and Tarim basins. Developing state of dickite directly reflects development and conectivity of denudation pore when it is formed and temperature condition of overlying formation, so studying dickite is very impotant to oil/exploration. Discovery of dickite in Tarim basin indicates that Lower Ordovician weathering crusts in westem Tarim basin(especially in Bachu-Maigaiti) are the most favourable area for gas accumulation. References | Related Articles | Metrics

DISCRIMINATION OF CONDENSATE GAS RESERVOIR AND ITS FAVOURABLE AREA IN GULONG SAG, SONGLIAO BASIN Chen Yicai, Li Yanjun, Yang Yuancong, Wang Tingdong, Li Yongkang, Wen Xiangfan, Kong Qingyun 1997, 18 (4):  313-318.  Abstract ( 98 )   PDF (425KB) ( 317 )   Save Based on gas oil- ratio characteristics of oil testing result, oil reservoir and. gas reservoir were discriminated for lack of PVT data in Gulong sag area. Moreover, on the basis of molar component of wellstream effluent, it is concluded that Putaohua oil-layer in area of Well Gu109 is a condensate gas reservoir with oil ring and medium condensate oil content according to comprehensive analyses of PVT phase diagram calculated by φ and Z value methods and PR state equation. Based on reservoir-forming mechanism of condensate gas reservoir, the favourable distribution area of condensate gas reservoir distribution was predicted. References | Related Articles | Metrics

FORMING CONDITION OF CARBONIFEROUS RESERVOIR IN BASHTTOP ANTICLINE, TARIM BASIN Chen Junxiang, Qu Qiuping, Qiu Bin 1997, 18 (4):  319-323.  Abstract ( 84 )   PDF (387KB) ( 223 )   Save On the basis of thermal evolution history of source rock, stuctural evolution history and diagenesis history of reservoir rock, this paper analysed formation and evolution of Carboniferous reservoir in Bashitop anticline, and established a“lower fault and upper fold" reservoir forming model. Mutiple movements of faulting in early stage are very important to formation of Carboniferous reservoir in Bashitop anticline, not only improving accumulation condition of reservoir, accelerating formation of trap, but linking up source rock and reservoir rock , playing a conductive role in oil/gas migration. References | Related Articles | Metrics

ORGANIC GEOCHEMISTRY

STUDY ON OIL SOURCE IN CAINAN OILFELD, JUNGGAR BASIN Ding Anna, Meng Qianxiang, Hui Rongyao 1997, 18 (4):  324-329.  Abstract ( 102 )   PDF (484KB) ( 245 )   Save On the basis of study on geochemical characteristics of saturated hydrocarbon of oil and source rock in Bajjiahai arch and its adjacent area in Junggar basin , understandings about component of oil source ，hydrocarbon-forming environment, evolutional degree and migration model of oil are obtained. It is pointed out that. Middle and Lower Jurassic (especially argillaceous rock of Sangonghe fommation) in Bajiahai arch and Fukang sag are major source rock in Cainan oilfield, and these provide scientific basis for further oil/ gas exploration. References | Related Articles | Metrics

STRATIGRAPHY AND SEDIMENTOLOGY

SEDIMENTARY FACIES AND SEQUENCES OF JURASSIC IN EASTERN JUNGGAR BASIN Tang Zhonghua, Huang Yun, Zhang Hualong 1997, 18 (4):  330-337.  Abstract ( 79 )   PDF (615KB) ( 276 )   Save According to sedimentary environment and facies, this paper further classified and correlated the Jurassic in eastern Junggar basin by using sequence stratigraphy method, and compreben-sively analysed sedimentary facies and sequence of study area by applying geologic, logging and seismic methods. It is considered that Jurassic is a set of termigeneous clastic sediments controlled by tectonic and climate conditions,which is divided into humid and arid type based on sedimentary characteristics; and also divided into northern genue slope type and southem steep slope type based on low- wter level system tract . References | Related Articles | Metrics

SEQUENCE STRATIGRAPHY IN DEVONIAN - CARBONIFEROUS TRANSIT PERIOD IN TARIM BASIN Chen Zhongqiang 1997, 18 (4):  338-347.  Abstract ( 108 )   PDF (1501KB) ( 200 )   Save This paper makes sequence stratigraphy analysis of Upper Devonian-Lower Carboniferous in southwestern Tarim,Bachu, Manxi, Hotan river, Tazhong and Tabei areas, and two sequences (corresponding to three-order sequences presented by Vail) were identifed. It is considered that Tarim basin have undergone two lange scale sea-level fluctuation. On the basis of sequence stratigraphy and biostratigraphy analyses, it is suggested that Paleozoic transgression of Tarim basin began at the Late Famenian in Late Devonian, and the age of“ Donghe sandstone”should be at the Late Famenian in I ate Devonian. References | Related Articles | Metrics

STUDY ON CAMBRIAN - ORDOVICIAN IN WELL KUNAN 1, TARIM BASIN Yong Tianshou 1997, 18 (4):  348-362.  Abstract ( 133 )   PDF (3647KB) ( 171 )   Save On the basis of trilobita, brachiopoda and conodont fossiles obtained from downhole, this paper studied downhole Cambrian-Ordovician section of Well Kunan 1. It is considered Cambrian-Ordovician and every formation of Cambrian as successive sediments. Related Articles | Metrics

RESERVOIR ENGINEERING

A SYSTEM OF METHODS USED FOR OILFIELD DEVELOPMENT DURING HIGH WATER-CUT STAGE Lin Zhifang, Yu Qitai, Peng Pengshang, Zhang zixian, Wang Shouping 1997, 18 (4):  363-369.  Abstract ( 74 )   PDF (531KB) ( 248 )   Save A complete system of methods used for oilfield development during high water-cut stage is presented. It includes three main contents. Of which there are some small specific items. The first is the study of methods of oilfeld development analysis. It includes:①study of oil water and oil-gas relative permeability; ② study of heterogeneity in oil reservoir; ③ analysis of recoverable reserves and recovery factor; ④ analysis of oil displacement efficiency and sweep efficiency; ⑤ analysis of increasing withdrawal rates in production wells; ⑥ analysis of water injectivity index in injection wells; ⑦ analysis of natural decline; ⑧ analysis of water storge rate and water displacement index; ⑨ analysis of reservoir pressure system; and ⑩ calculation of water influx into reservoir. The second is the study of remaining oil. It includes: ① study of macro-distribution of remaining oil; ② study of micro-distribution of remaining oil; and ③ study of saturation of remaining oil. The third is the study of adjustment methods for improving development effect in waterflooding reservoir . It includes: ① to augment mangement and combined adjustment; ② infill wells; ③ method of I0R;④ method of EOR; ⑤ downhole measures; and ⑥ horizontal wells. It shows that this system not only can be used to adjustment of a specific oil reservoir, but to adjustment of an oilfield during high water- cut stage. Used this system to adjustment of Sha Er 1~ 5 series of strata of southern zone in Pucheng oilfeld, a great success has been made. It proves that this system is scientific, advanced and operable and has an important value for application and dissemination. References | Related Articles | Metrics

INTERPRETATION OF NON-CLOSED FAULT BY APPLYING WELL TESTING METHOD Li Chuanliang 1997, 18 (4):  370-376.  Abstract ( 80 )   PDF (476KB) ( 198 )   Save An incomplete mirror-image reflection method was presented for solving the well testing interpretation of non-closed fault. The distance between testing well and fault and flow conductivity of fault can be determined by applying this method. This paper presented new concepts about fault effective conductive thickness and fault connectivity. The study results will be of great value in oil/gas reservoir description, numeric simulation and oil/gas field development. References | Related Articles | Metrics

AN ACCURACY FORMULA FOR CALCULATING FORMATION OIL VOLUME FACTOR OF ULTRADEEP RESERVOIR Ling Jianjun, Huang Li, Wang Youfu 1997, 18 (4):  377-379.  Abstract ( 250 )   PDF (231KB) ( 180 )   Save Fornation oil volume factor calculated with conventional method has bigger error is imreasonable because oil compressional factor is regarded as constant. In fact, oil compressional factor is in inverse proportion to fornation pressure, so we derived an accuracy formula for calculating formation oil volume factor by adopting equivalent compressional factor, and provided case history with it. References | Related Articles | Metrics

ORIGIN OF Low RESISTIVITY PAY ZONE AND ITS STUDY METHOD-An Example from Liaohe Oilfield Kang Zhiyong 1997, 18 (4):  380-384.  Abstract ( 147 )   PDF (384KB) ( 215 )   Save Low resistivity pay zone includes two types of reservoirs, one is siltstone reservoir, the other is clayey sandstone reservoir. The resistvities of these two types of reservoir are similar to that of water layer because of high water saburation formed by strong capillary action and large inner surface area. After analysing the geologic characteristics of low resistivit pay zone in Jin 16 Block of Liaohe oilfeld, the author presented a method for discriminating low resistivity pay zone, that is, on the basis of forming conditions of pool and lithologic characteristics of reservoir, low resistivity pay zone can be identifed by using logging informnation and core data. References | Related Articles | Metrics

CALCULATION OF RECOVERABLE RESERVES OF SINGLE WELL AT ECONOMIC LIMIT IN OLD OIL AREA Zhang Yu, Wang Xiangdong, Wang Jianfeng 1997, 18 (4):  385-387.  Abstract ( 85 )   PDF (323KB) ( 210 )   Save Based on analyses of factors affecting controllable reserves of single well, this paper presented a formula for calculating recoverable reserves of single well at economic limit combining with economic index . This formula was applied in six heavy and light oil infill adjustment blocks in Xinjiang oilfield, and sensitivity analyses of average well depth and operation cost to recoverable reserves of single well at economic limit were made. References | Related Articles | Metrics

THERMAL VISCOUS OIL RECOVERY

EFFECT OF REFREEZING TECHNOLOGY ON CORE PHYSICAL PARAMETERS AND THEIR CORRECTION Zhao Fuzhen, Zeng Xiangmin, Chen Xinhua 1997, 18 (4):  389-391.  Abstract ( 91 )   PDF (244KB) ( 172 )   Save Using core refreezing technology to refreeze unconsolidated core from watered out area and heavy oil area can make core shape, prevent volatilization loss of fluid in core, and be favourable to determine the parameters as fuid saturation and the like. But fluid expansion of core resulted from refreezing can destroy pore structure of core, make physical parameters before and after refreezing change. Based on correlation analyses, this paper discussed changing regularity of porosity, peme-ability and saturation etc, presented a correction equation of porosity and correction factor of peme-ability, put forward step correction method of saturation, providing convient conditions for oilfield to properly use physical analysis data of refrozen core. References | Related Articles | Metrics