Exploration Prospects of Shale Gas of Upper Sinian-Silurian in Mid-Yangtze Region

Abstract

Abstract: Based on the outcrop, geochemistry and drilling data, this paper analyzes exploration prospects of Cambrian-Silurian shale gas resource in mid-Yangtze region. The analysis indicates that the Cambian-Silurian shale is dominated by Doushantuo formation of Upper Sinian, Shuijingtuo formation or Niutitang formation (Lower Cambrian) and Silurian in this region. These argillaceous rock and shale characterized by rich organic matter content, fine kerogen type and high thermal evolution (mature to overmature) are valid source rocks of the shale gas. The mid- Yangtze region undergoes multistage tectonic movements since Caledonian. The shale reservoir quality is improved by tectonic uplift and compression, increasing the accumulation amount of shale gas. It is concluded that the mudstone-shale of Upper Sinian and Lower Cambrian can be as favorable areas for shale gas exploration in western Hunan and Hubei. And the commercial shale gas flow of Silurian discovered by drilling reveals that this area is rich in shale gas resources of Silurian in western Hubei and eastern Chongqing.

Key words: mid-Yangtze region, Upper Sinian, Lower Cambrian, Silurian, shale gas

CLC Number:

TE122.2

LI Yan-xia, LI Jing-hong. Exploration Prospects of Shale Gas of Upper Sinian-Silurian in Mid-Yangtze Region[J]. Xinjiang Petroleum Geology, 2010, 31(6): 659-663.

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