地层油气藏主要勘探进展及未来重点领域

doi:10.12108/yxyqc.20210102

Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (1): 12-24.doi: 10.12108/yxyqc.20210102

• FORUM AND REVIEW • Previous Articles Next Articles

Main exploration progress and future key fields of stratigraphic reservoirs

ZHU Rukai^1,2, CUI Jingwei^1,2, MAO Zhiguo^1,2, CAO Zhenglin¹, WANG Xingzhi³, GAO Changhai⁴, LIU Yongfu⁵

1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
2. Key Laboratory of Petroleum Reservoir, PetroChina, Beijing 100083, China;
3. College of Earth Science and Technology, Southwest Petroleum University, Chengdu 610500, China;
4. Key Laboratory of Deep Oil and Gas, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
5. Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China

Received:2020-08-19 Revised:2020-10-25 Online:2021-02-01 Published:2021-01-25

Abstract

Abstract: In recent years,remarkable progress has been made in the exploration of stratigraphic reservoirs. In order to review the exploration progress of stratigraphic reservoirs in China during the 13th Five-Year Plan period and to look forward to the key exploration fields in the future,the anatomy of typical stratigraphic reservoirs was carried out,then the accumulation laws in three different types of stratigraphic reservoirs were studied,including large-scale clastic rock overlap-cut type,carbonate weathered crust type,volcanic or metamorphic rock type, and finally the resource potential of stratigraphic reservoirs was evaluated. The results show that:(1)The exploration have achieved significant progress in stratigraphic reservoirs of the Permian and Carboniferous in Junggar Basin,the Sinian Top-Ordovician of the three major craton basins in China(Sichuan,Tarim,Ordos),and the bedrock of Songliao Basin,whose oil and gas equivalents obtained are all in the billion-ton-odds.(2)Largescale stratigraphic reservoirs are controlled by long-term inherited ancient slopes,regional unconformities,and transport systems at the basin margin or inner-basin uplift periphery,and develop giant-large stratigraphic hydrocarbon accumulations in quasi-layered clusters way. There are two types of stratigraphic reservoirs including weathered crust type and inner surface type,and both can be accumulated in a large scale.(3)The key areas for exploration of stratigraphic oil and gas reservoirs are the unconformity weathering crust inner or between Sinian-Ordovician carbonate beds among the three major cratons in China,overlap-cut stratum of the Permian clastic rocks in the six slope areas of Junggar Basin,and bedrock dominated by volcanic rock or metamorphic rock.(4)Future exploration technologies are expected to strengthen the identification of multi-level unconformities in the basin, the comprehensive analysis of accumulation factors,and the integration of geophysical exploration technologies. The accumulation theory of large-scale stratigraphic reservoirs would be built and promote the exploration of them in China by focusing on the discovery of new oil and gas layers in the longitudinal direction and extension of new oil and gas areas in the plane dimension. The research results have an important guiding role for the development of future exploration technology and the deployment of key areas of stratigraphic reservoirs.

Key words: unconformity, exploration progress, accumulation law, future fields, stratigraphic reservoirs

CLC Number:

TE122.1

ZHU Rukai, CUI Jingwei, MAO Zhiguo, CAO Zhenglin, WANG Xingzhi, GAO Changhai, LIU Yongfu. Main exploration progress and future key fields of stratigraphic reservoirs[J].Lithologic Reservoirs, 2021, 33(1): 12-24.

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