Characteristics of Permian volcanism in the western Sichuan Basin and its natural gas exploration potential

被引：0
|
作者：
Lu J. [1 ]
Zuo Z. [1 ]
Shi Z. [1 ]
Dong X. [2 ]
Wu Q. [2 ]
Song X. [2 ]
机构：
[1] Wuxi Research Institute of Petroleum Geology, Sinopec Petroleum Exploration & Production Research Institute, Wuxi, 214126, Jiangsu
[2] Exploration and Development Research Institute, Sinopec Southwest Petroleum Company, Chengdu, 610041, Sichuan
来源：
Natural Gas Industry | 2019年 / 39卷 / 02期
关键词：
Emeishan basalt; Exploration potential of natural gas; Permian; Volcanic reservoir; Volcanic rock; Volcanism; Western Sichuan Basin;
D O I：
10.3787/j.issn.1000-0976.2019.02.006
中图分类号：
学科分类号：
摘要：
It was previously deemed that volcanic rocks in the western Sichuan Basin were not developed, which restricted the exploration of volcanic gas reservoirs in this area. Recently, however, Sinopec's wildcat well, Well YS1 encounters Upper Permian volcanic rocks about 300 m thick in the western Sichuan Basin, the reservoir physical properties of which are good with strong gas shows. In order to evaluate the exploration prospect of volcanic gas reservoirs in western Sichuan Basin, we studied the Permian volcanic rocks in this area from the aspects of formation and development characteristics, reservoir characteristics, gas genesis and plays based on the new understandings on exploration wells, combined with the analysis on tectonic evolution and its controlling effect on volcanism. Then, the volcanic eruption mechanism, the distribution mode of volcanic edifice and the hydrocarbon accumulation pattern of volcanic gas reservoir were figured out. Finally, the exploration potential of natural gas was evaluated. And the following research results were obtained. First, the Permian volcanic rocks in western Sichuan Basin are developed and its tectonic setting is consistent with that of Emeishan basalt, which is the product of the Emeishan mantle plume. Second, under the control of vertical faults, a great number of volcanic edifices are developed and there are many eruption cycles. Volcanic rocks are superimposed vertically and connected laterally. Third, the volcanic rocks in western Sichuan Basin are different to some extent from those in southwestern Sichuan Basin in terms of lithology, lithofacies and reservoir characteristics. In the western Sichuan Basin, the tuff of explosive facies is dominant with some basalt of effusive facies, and the reservoir space of volcanic rocks is mainly acted by inter-breccia skeleton pores, dissolved pores and matrix micro-pores. In conclusion, multiple sets of effective source rocks are developed around the volcanic intervals in western Sichuan Basin, and together they constitute effective natural gas plays. Therefore, it has a better natural gas exploration prospect, an d it is a new field worthy of attention. © 2019, Natural Gas Industry Journal Agency. All right reserved.
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页码：46 / 53
页数：7
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