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Origin of gas condensate reservoir in fuman oilfield, Tarim Basin, NW China

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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Key oil accumulation periods of ultra-deep fault-controlled oil reservoir in northern Tarim Basin, NW China

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Petroleum Exploration and Development 2022年第2期49卷 285-299页

作者： YANG Shuai WU Guanghui ZHU Yongfeng ZHANG Yintao ZHAO Xingxing LU Ziye ZHANG Baoshou School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China PetroChina Key Laboratory of Carbonate Reservoir Southwest Petroleum UniversityChengdu 610500.China Tarim oilfield Company PetroChinaKorla 841000China Southwest Oil and Gas Field Company PetroChinaChengdu 610051China

A giant fault-controlled oilfield has been found in the ultra-deep(greater than 6000 m) Ordovician carbonate strata in the northern Tarim Basin. It is of great significance for hydrocarbon accumulation study and oil exploitation to determine the key oil accumulation periods. Based on detailed petrographic analysis, fluid inclusion association(FIA) in calcite samples filling in fractures from 12 wells were analyzed, and key accumulation periods of the strike-slip fault-controlled oilfield was studied by combining oil generation periods of the source rocks, formation periods of the fault and traps, and the fluid inclusion data.(1) There are multiple types of FIA, among them, two types of oil inclusions, the type with yellow fluorescence from the depression area and the type with yellow-green fluorescence from the uplift area with different maturities indicate two oil charging stages.(2) The homogenization temperature of the brine inclusions in FIA is mostly affected by temperature rises, and the minimum temperature of brine inclusions symbiotic with oil inclusions is closer to the reservoir temperature during its forming period.(3) FIA with yellow fluorescence all have homogenization temperatures below 50 ℃, while the FIA with yellow-green fluorescence have homogenization temperatures of 70–90 ℃ tested, suggesting two oil accumulation stages in Middle-Late Caledonian and Late Hercynian.(4) The Middle-Late Ordovician is the key formation period of the strike-slip fault, fracture-cave reservoir and trap there.(5) The oil generation peak of the main source rock of the Lower Cambrian is in the Late Ordovician, and the oil accumulation stage is mainly the Late Ordovician in the depression area, but is mainly the Early Permian in the uplift area. The key oil accumulation period of the strike-slip fault-controlled reservoirs is the Late Caledonian, the depression area has preserved the primary oil reservoirs formed in the Caledonian, while the uplift area has secondary oil r

关键词： ultra-deep strata strike-slip fault-controlled oil reservoir accumulation period accumulation evolution fluid inclusion fuman oilfield Tarim Basin

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