Genetic mechanism of high-quality shale gas reservoirs in the Wufeng-Longmaxi Fms in the Sichuan Basin

被引：0
|
作者：
Nie H. [1 ,2 ,3 ]
He Z. [1 ,2 ,4 ]
Liu G. [1 ,2 ,3 ]
Du W. [1 ,2 ,3 ]
Wang R. [1 ,2 ,3 ]
Zhang G. [5 ]
机构：
[1] State Key Laboratory of Shale Oil & Gas Enrichment Mechanisms and Effective Development, Beijing
[2] Sinopec Key Laboratory of Shale Oil/Gas Exploration & Production, Beijing
[3] PetroChina Research Institute of Petroleum Exploration & Production, Beijing
[4] Department of Science and Technology, China Petroleum & Chemical Corporation, Beijing
[5] School of Energy Resource, China University of Geosciences, Beijing
来源：
Natural Gas Industry | 2020年 / 40卷 / 06期
关键词：
Biogenic silicon; Genetic mechanism; High-quality reservoir; Lower Silurian Longmaxi Formation; Shale gas; Sichuan Basin; Upper Ordovician Wufeng Formation;
D O I：
10.3787/j.issn.1000-0976.2020.06.003
中图分类号：
学科分类号：
摘要：
The Upper Ordovician Wufeng Formation and the Lower Silurian Longmaxi Formation are important strata for shale gas exploration and development in the Sichuan Basin, but the genetic mechanism, evolutionary history and the controlling effect of mineral diagenetic evolution on the formation of shale gas reservoirs are not clear. In this paper, the evolution history of organic matter pores and the diagenetic evolution of minerals were analyzed based on the analysis of petrology, mineralogy and organic geochemistry, combined with basin simulation and practical shale gas exploration and development. Then, the types and genetic mechanisms of high-quality shale gas reservoirs were discussed, and the development intervals of high-quality shale gas reservoirs were determined. And the following research results are obtained. First, the shale gas development intervals of Wufeng-Longmaxi Fm in the Sichuan Basin are mainly dominated by siliceous shale, limy siliceous shale and clay shale. Rock type has an important controlling effect on the types and characteristics of shale reservoir space. Siliceous shale and limy siliceous shale have the highest reservoir capacity with the most developed organic pores. Second, the diagenetic evolution of minerals controls the formation of shale gas reservoirs. Biogenic silicon, was formed in the early diagenetic stage, together with terrestrial detrital silicon and pyrite, constitutes particle support lattices in the form of microcrystalline aggregates, so as to resist the compaction effectively and preserve a great number of residual intergranular pores, which is beneficial to the formation of high-quality shale gas reservoirs. Third, siliceous shale in the WF2-LM4 graptolite zone (from Wufeng Formation to the bottom of Longmaxi Formation) presents a high-quality reservoir genetic mechanism of "multicellular algae controlling hydrocarbon source, biogenic silicon controlling framework, and co-evolution controlling a high-quality reservoir". In conclusion, the siliceous shale and limy siliceous shale in the WF2-LM4 graptolite zone are the main development intervals of high-quality shale gas reservoirs. © 2020, Natural Gas Industry Journal Agency. All right reserved.
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页码：31 / 41
页数：10
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