Title: Characteristics and Genetic Mechanism of Upper Triassic Xu-5 Member Shale Gas Reservoir in West Sichuan Depression
Abstract: Summary Shale gas has become a new exploration target in China since 2009 and has been discovered in many basins which including Sichuan, Tarim, Ordos, Tuha, Songliao, Bohai Bay etc. and with a total reserves of over 26 × 1012m3. Xu-5 Member (the fifth member of Xujiahe Formation) in western Sichuan Basin is a kind of shale gas reservoir of lacustrine environments with a total reserve of 1.47∼1.68×1012m3. In order to help with the gas exploration, this paper discusses the depositional and diagenetic controls on shale gas reservoir quality of the Xu-5 Member by using research methods of thin-section and FE-SEM observation, bulk-rock analysis as well as porosity & permeability measurements suitable for shale gas reservoir, and thus generates the conclusion that the quiet water environment is the most important controlling factor: Low-energy environments caused shale frequently interbedded with sandstone and siltstone, which was the controlling factor of shale constituents (high quartz contents) and thus made it easily to form fractures. Also, quiet water environment was oxygen free and rich in organic material, which was good for not only hydrocarbon generation but also developing micro-pores within organic matter.
Publication Year: 2014
Publication Date: 2014-09-21
Language: en
Type: article
Indexed In: ['crossref']
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