Practices and Cognitions of Petroleum Exploration in Mesozoic,Ordos Basin

doi:10.7657/XJPG20220301

Abstract

Abstract:

The Ordos basin is the second largest sedimentary basin in China with abundant oil and gas resources and broad exploration prospects. Typical low-permeability-tight oil reservoirs are develpoed in the Triassic Yanchang formation in the basin,which are difficult to explore. Through continously geological researches on the Mesozoic oil reservoirs in the Ordos basin over the past 50 years,some theories about hydrocarbon accumulation in Jurassic reservoir groups,in large-scale lithologic reservoirs in inland depression lake basins and in continental shales have been formed. By virtue of three strategic shifts,four conventional hydrocarbon provinces with reserves exceeding 10×10⁸ t and a successive zone with shale oil reserves of 20×10⁸ t have been discovered. The proven oil reserves have increased by an average of over 3×10⁸ t per year for 10 consecutive years. Thus,Changqing oilfield in Ordos basin has become an oil and gas province with the fastest increase in reserves and production in China and contributed 12.5% of China's annual oil production,which provides a reference for the petroleum exploration in other similar basins.

Key words: Ordos basin, Mesozoic, Triassic, Jurassic, lake basin, exploration enlightenment, exploration prospect

CLC Number:

TE132

LUO Anxiang, YU Jian, LIU Xianyang, JIAO Chuangyun, HAN Tianyou, CHU Meijuan. Practices and Cognitions of Petroleum Exploration in Mesozoic,Ordos Basin[J]. Xinjiang Petroleum Geology, 2022, 43(3): 253-260.

Figures/Tables 10

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时间	勘探重点	成藏理论	主要技术类型	总资源量/10⁸ t
20世纪80年代	侏罗系油藏	古地貌成藏理论	解堵性改造	19.06
20世纪90年代	三角洲油藏	曲流河三角洲成藏理论	常规加砂压裂	40.00
21世纪初	大型岩性油藏	辫状河三角洲成藏理论、多层系复合成藏理论	多级加砂、前置酸压裂	85.88
现今	致密油藏、页岩油藏	湖盆中部成藏理论、页岩油成藏理论	水平井体积压裂	169.00