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Forming mechanism of hydrocarbon reservoirs in yingshan formation of Yuqi block in Akekule arch,Tarim Basin

Journal of Central South University of Technology 2008年第2期15卷 244-250页

作者：旷理雄郭建华黄太柱 School of Geoscience and Environmental Engineering Central South University Institute of Petroleum Exploration and Development of SINOPEC Northwest Branch Company

The reservoir conditions,oil and gas charge history and accumulation phases were studied for yingshan formation of Yuqi block,and an oil and gas accumulation model was established by using the techniques of reservoir prediction,fluorescence thin section and fluid inclusion analysis under the guidance of the theories of oil and gas *** results indicate that the main rock types in yingshan formation are micrite and *** carbonate reservoirs are of cave,fracture-pore and fracture types,and their physical properties are intermediate;there are at least four oil/gas charges,*** Hercynian,Yanshanian,early Himalayan and middle Himalayan(Cenozoic).The most important charge periods are late Hercynian,early Himalayan and middle Himalayan;the oil and gas accumulation model is self source-lateral expulsion of hydrocarbon-multistage accumulation,or hydrocarbon sourced from and preserved in the same old rocks-long term expulsion of hydrocarbon-multistage accumulation.

关键词： reservoir oil and gas charge accumulation model yingshan formation Akekule arch northern Tarim Basin

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Factors controlling the development of carbonate reservoirs of Ordovician yingshan formation in the Gucheng area, Tarim Basin

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能源地球科学(英文) 2023年第3期4卷 18-25页

作者： Juan He Exploration&Production Research Institute SINOPECBeijing102206China

Deep carbonate rocks are important targets for oil and gas exploration in China. In recent years, significant oil/gas discoveries have been made in the deep carbonate sequences in the Tarim, Sichuan, Ordos, and Bohai Bay basins. Despite significant oil/gas discoveries, large-scale exploration has not been conducted in the Gucheng area in the Tarim Basin. To break the bottleneck restricting the petroleum exploration in the Gucheng area, this study analyzed the factors controlling the formation of carbonate reservoirs of the yingshan formation in the Gucheng area in detail based on the basic geological conditions of the study area and the data from cores, thin sections, well logging, testing, and 3-D seismic survey. The inner shallow-ramp in the Gucheng area acts as the main sedimentary facies zone for the development of high-quality reservoirs. The grainstones formed in the high-energy environment of the inner shallow-ramp laid the foundation for subsequent reservoir development in the study area. The dolomitized shoal grainstones in the inner shallow-ramp have well-developed intercrystalline pores and intercrystalline dissolved pores due to later dolomitization, thus serving as high-quality reservoirs. Strike-slip faults are crucial to reservoir reformation and determine whether high production can be achieved in oil and gas exploitation in the study area. Moreover, later reformation by hydrothermal solutions also plays a constructive role in reservoir formation.

关键词： Inner shallow ramp Dolonitized shoal Strike-slip fault Hydrothermal process yingshan formation Tarim Basin

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Origin of gas condensate reservoir in Fuman Oilfield, Tarim Basin, NW China

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Petroleum Exploration and Development 2023年第6期50卷 1295-1307页

作者： WANG Qinghua Tarim Oilfield Company PetroChinaKorlaXinjiang 841000China R&D Center for Ultra-Deep Complex Reservoir Exploration and Development CNPCKorlaXinjiang 841000China Engineering Research Center of Ultra-deep Complex Oil and Gas Reservoir Exploration and Development Xinjiang Uygur Autonomous RegionKorlaXinjiang 841000China

To understand the reservoir property and hydrocarbon accumulation conditions of the Middle and Upper Ordovician intraplatform shoal between ultra-deep main strike-slip faults in Fuman Oilfield of the Tarim Basin, China, the main strike-slip faults in and around well FD1 in the basin were analyzed in terms of sedimentary facies, sequence stratigraphy, intraplatform shoal reservoir property, and oil and gas origins, based on drilling data. The yingshan formation intraplatform shoal between the main strike-slip faults is superimposed with low-order faults to form a new type of hydrocarbon play. Firstly, hydrocarbons generated from the Lower Cambrian Yuertusi formation source rocks vertically migrated into the second member of yingshan formation through the main strike-slip faults, and then migrated laterally until they were accumulated. A small amount of oil from Well FD1 came from the Yuertusi formation source rocks in the mature stage, and a large amount of gas originated from oil cracking in the ultra-deep reservoirs. Therefore, the secondary gas condensate reservoir in Well FD1 is characterized by high gas to oil ratio, dry gas (dryness coefficient being 0.970) and hybrid origin. This new type of hydrocarbon play characterized by intraplatform shoal and low-order fault suggests a prospect of continuous hydrocarbon-bearing area in Fuman Oilfield, which will expand the ultrap-deep oil and gas exploration in the oilfield.

关键词： low-order fault intraplatform shoal ultra-deep yingshan formation oil cracked gas condensate gas Fuman Oilfield Tarim Basin

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