首页|Genesis and Accumulation of Paleo-Oil Reservoir in Dabei Area,Kuqa Depression,Northwest China:Implications for Tight-Gas Accumulation

Genesis and Accumulation of Paleo-Oil Reservoir in Dabei Area,Kuqa Depression,Northwest China:Implications for Tight-Gas Accumulation

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Paleo-oil reservoir is of great importance to understand hydrocarbon enrichment mecha-nism and hydrocarbon exploration potential,but is yet poorly investigated in Kuqa Depression.The oc-currence of the paleo-oil reservoir in Dabei area was proved by quantitative grain fluorescence(QGF)and fluid inclusion petrography.Development history of the paleo-oil reservoir was reconstructed through:(1)oil-source correlation;(2)time coupling of source rock maturation,porosity evolution and migration pathways.The impact of paleo-oil reservoir on tight-gas accumulation was consequently dis-cussed.Results suggest that considerable oil was accumulated in the K1bs reservoir with paleo oil-water contact in Dabei 2 Well and Dabei 201 Well at 5800 and 6040 m,respectively.Crude oil was primarily sourced from Triassic source rocks with Jurassic source rocks of secondary importance,which was at oil generation window(0.7%-1.1%Ro)during 9-6 and 7.5-5 Ma,respectively.The occurrence of K1bs tight reservoir(porosity<12%)was about 25 Ma,while faults and associated fractures at Kelasue structural belt were developed approximately from 8 to 3.5 Ma.Therefore,the tight oil accumulation was formed during 8-5 Ma.The paleo-oil reservoir in Dabei 1 gas field was destroyed by the evapora-tion fractionation in later stage.

Paleo-oil reservoirDabei areaKuqa DepressionNorthwest Chinapetroleum geology

Fujie Jiang、Xiao Chen、Pengwei Wang、Xinghe Shao、Haijun Yang

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State Energy Center for Shale Oil Research and Development,Beijing 102206,China

National Key Laboratory of Oil and Gas Resources and Engineering,Beijing 102249,China

College of Geosciences,China University of Petroleum,Beijing 102249,China

CNOOC International Ltd.,Beijing 100027,China

Research Institute of Petroleum Exploration&Production,SINOPEC,Beijing 100083,China

Research Institute of Petroleum Exploration and Development,Tarim Oilfield,PetroChina,Korla 841000,China

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China National Science and Technology Major Project

2016ZX05047-001-006

2024

10.1007/s12583-021-1562-4

地球科学学刊(英文版)
中国地质大学

地球科学学刊(英文版)

CSTPCD
影响因子：0.724
ISSN：1674-487X
年,卷(期)：2024.35(2)
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