Accumulation model and favorable exploration area distribution of the Middle Permian oil and gas in the Sichuan Basin

被引：0

作者：

Song J. ^{[1
]}

Liu S. ^{[1
,2
]}

Li Z. ^{[1
]}

Zhang B. ^{[3
]}

Deng B. ^{[1
]}

Jiang Q. ^{[4
]}

Jin X. ^{[1
]}

Sun W. ^{[1
]}

Wang H. ^{[3
]}

Guo H. ^{[5
]}

Chen X. ^{[3
]}

Wang J. ^{[1
]}

Tian X. ^{[6
]}

Zhang X. ^{[3
]}

Ye Y. ^{[1
]}

Yang D. ^{[1
]}

Fan J. ^{[1
]}

Luo P. ^{[1
,4
]}

机构：

[1] State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation/, Chengdu University of Technology, Sichuan, Chengdu

[2] Xihua University, Sichuan, Chengdu

[3] PetroChina Southwest Oil & Gasfield Company, Sichuan, Chengdu

[4] PetroChina Research Institute of Petroleum Exploration & Development, Beijing

[5] Southwest Geophysical Prospecting Research Institute of BGP INC., China National Petroleum Corporation, Sichuan, Chengdu

[6] Exploration and Development Research Institute, PetroChina Daqing Oilfield Company, Heilongjiang, Daqing

来源：

Natural Gas Industry | 2023年 / 43卷 / 11期

关键词：

Favorable exploration area; Hydrocarbon accumulation model; Middle Permian; Sepiolite bearing strata; Sichuan Basin; Tongjiang-Changshou sag;

D O I：

10.3787/j.issn.1000-0976.2023.11.006

中图分类号：

学科分类号：

摘要：

In recent years, the Middle Permian in the Sichuan Basin has achieved significant results in natural gas exploration, and is the current focus horizon of exploration, development and research, but its hydrocarbon accumulation model and process and the distribution of favorable exploration areas have not been clarified. To address these problems, this paper modifies the lithofacies paleographic map of the Middle Permian after analyzing the sedimentary environment of sepiolite bearing strata. Then, the source-reservoir configuration and hydrocarbon accumulation model under the control of Tongjiang-Changshou sag are illustrated, and the favorable exploration areas of the Middle Permian are defined. And the following research results are obtained. First, influenced by the extension evolution of the Paleotethys Ocean, the subduction of the Mianlue Ocean, and the tectonic thermal event of the Emeishan large igneous province, the Tongjiang-Changshou intracratonic sag was formed in the Sichuan Basin during the Middle Permian. Second, during the sedimentation of the Qixia Formation, sedimentary facies belts were of NE and NW trending, and the distribution of the intra-platform NW beach was controlled by the Tongjiang-Changshou sag. Third, during the sedimentation of the second Member of Maokou Formation, the sedimentary facies belts were distributed along the NW-SE direction mainly under the control of the Tongjiang-Changshou sag, and the marginal beaches on both sides of the sag were developed. Fourth, the growth of the Tongjiang-Changshou sag provides two new modes of source-reservoir assemblage (i.e., self source and self reservoir, and side source and side reservoir) for the source-reservoir configuration of the Middle Permian. Fifth, the sepiolite in the sag is thick, so abundant organic matter is adsorbed and preserved in the cold water environment to form high-quality source rocks. In the burial environment, a large amount of sepiolite is transformed and dissolved to form a great number of organic pores and clay micropores. Thus, the configuration of self-source and self-reservoir is formed in the sag. In the meantime, the magnesium ion rich diagenetic water released during sepiolite transformation dolomitizes the marginal beach of the sag through lateral and vertical migration, forming high-quality dolomite reservoirs. Thus, the configuration of side source and side reservoir is formed. In conclusion, the Tongjiang-Changshou sag controls the distribution of the Middle Permian oil and gas in the Sichuan Basin, and the most favorable exploration area of the Middle Permian unconventional argillaceous limestone gas reservoir of self-source and self-reservoir type is mainly located in the Tongjiang-Changshou sag, covering an exploration area of about 24 800 km2, while the most favorable exploration area of the conventional gas reservoir of side source and side reservoir type is mainly distributed in the marginal belts on both sides of the Tongjiang-Changshou sag, covering an exploration area of 47 700 km2 © 2023 Natural Gas Industry Journal Agency. All rights reserved.

引用

页码：54 / 71

页数：17

共 90 条

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