Development Tendency of Geological Theory of Total Petroleum System: Insights From the Discovery of Mahu Large Oil Province

doi:10.7657/XJPG20210101

Abstract

Abstract:

Petroleum system is a basic tool for strategic oil and gas exploration and the geological theory of petroleum system needs to be extended with the development of unconventional petroleum geology theory. Based on the review of the evolution of petroleum system theory and the analysis of its development tendency, the paper studies the discovery history of the large oil province of Mahu. The research results show that the discovery of the Mahu large oil province represents a microcosm of the development of petroleum system theory. The large oil province of Mahu where all kinds of reservoirs can be found has the basic conditions of source-reservoir coupling, providing empirical evidences for the establishment of the total petroleum system theory. Taking Mahu sag as a case, there are possibly four directions for the exploration of total petroleum system–from outer-source to inner-source, from conventional resources to unconventional resources, from shallow strata to deep ones, and from single traps to continuous geological bodies.

Key words: Junggar basin, Mahu sag, total petroleum system, petroleum system, large oil province, unconventional oil and gas

CLC Number:

TE122.32

TANG Yong, CAO Jian, HE Wenjun, SHAN Xiang, LIU Yin, ZHAO Kebin. Development Tendency of Geological Theory of Total Petroleum System: Insights From the Discovery of Mahu Large Oil Province[J]. Xinjiang Petroleum Geology, 2021, 42(1): 1-9.

Figures/Tables 8

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Table 1

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资源类型	成藏位置	成藏方式	运聚动力	储集层岩性	孔隙直径/μm	临界喉道半径/nm	渗流方式	分布特征	分布位置
常规油气	远源	浮力成藏	浮力	砂砾岩含砾砂岩	>10.0	>100	达西流	单体式集合式	断裂带及斜坡区
致密油气	近源	活塞式成藏	浮力、生烃压力	粉砂质白云岩白云质粉砂岩	0.5~10.0	50~100	非达西流	准连续式	斜坡区
页岩油气	源内	源内滞留成藏	生烃压力	白云质泥岩白云质页岩	<0.5	<50	非达西流	连续式	凹陷区