Main controlling factors and natural gas exploration potential of Permian scale volcanoclastic reservoirs in the western Sichuan Basin

被引：0

作者：

Xie J. ^{[1
]}

Li Y. ^{[1
]}

Yang Y. ^{[2
]}

Zhang B. ^{[1
]}

Liu R. ^{[1
,3
]}

He Q. ^{[1
]}

Wang W. ^{[1
]}

Wang Y. ^{[4
]}

机构：

[1] Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu

[2] PetroChina Southwest Oil & Gasfield Company, Chengdu

[3] College of Geosciences, China University of Petroleum, Beijing

[4] Northwest Sichuan Division, PertroChina Southwestern Oil and Gas Field Company, Jiangyou

来源：

Natural Gas Industry | 2021年 / 41卷 / 03期

关键词：

Hydrocarbon play; Large-scale reservoir; Main control factor; Natural gas exploration potential; Permian; Volcanoclastic rock gas reservoir; Western Sichuan Basin;

D O I：

10.3787/j.issn.1000-0976.2021.03.006

中图分类号：

学科分类号：

摘要：

Great breakthroughs and new progresses have been realized in the exploration of volcanoclastic gas reservoirs in the Sichuan Basin since a porous volcanoclastic reservoir was discovered in Well YT1 in the western Sichuan Basin in 2018 followed by another one of 79 m in thickness discovered in Well TF2. In order to clarify the exploration prospect of the Permian volcanic gas reservoir in the western Sichuan Basin, this paper systematically studies the characteristics and main controlling factors of volcanoclastic reservoir in this area by using geological, geophysical and geochemical technologies and methods comprehensively, based on the petrological and petrographical analysis results on the Permian volcanoclastic rock, combined with the latest physical property data. Then, the natural gas exploration potential in this area is discussed based on the match relationships between hydrocarbon accumulation factors. And the following research results were obtained. First, Permian volcanic rocks in the Sichuan Basin are the products of intraplate mantle plume activity. In the western Sichuan Basin mainly develops an eruptive volcanoclastic reservoir, whose reservoir space is dominated by diffuse devitrified dissolved micropores with better pore throat sorting. Second, volcanic edifice and eruptive cycle are the main factors controlling the development of scale reservoir. In the early stage of volcanic activity, the energy is strong and a thick eruptive reservoir is formed, which is the most favorable facies belt for reservoir development. The closer it is to the center of the volcanism, the thicker the eruptive facies is and the more complete the cycle is. Third, the Permian volcanoclastic gas reservoir is underlain by high-quality source rocks of Lower Cambrian Qiongzhusi Formation under the control of fault trough whose oil and gas migrates into the high-quality eruptive reservoir along high angle faults, and its overlying Permian Longtan Formation provides high-quality cap rocks. Thus, the favorable play for large-scale natural gas migration and accumulation is formed. In conclusion, the Permian volcanoclastic rocks in the western Sichuan Basin have the geological conditions for the development of scale high-quality reservoir. In addition, the conditions of hydrocarbon play in this area are good, natural gas resource abundance is large and natural gas exploration and development potential is great. Therefore, it is one of the important fields for the reserves and production increase of natural gas in the Sichuan Basin. © 2021, Natural Gas Industry Journal Agency. All right reserved.

引用

页码：48 / 57

页数：9

共 28 条

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