四川盆地川中地区须家河组天然气大面积成藏的主控因素

doi:10.11743/ogg20090504

Abstract

Abstract:

The Triassic Xujiahe Formation(T₃χ) in central Sichuan Basin features in interbeded sandstone and mudstone and extensive distribution.Many gas fields(e.g.,Guang'an,Hechuan and Bajiaochang) and gas-bearing structures(e.g.,Chongxi) have been found in this formation.Horizontally,this gas-bearing combination is distributed in different structural zones;vertically,it has many alternating intervals of reservoirs.These reservoirs have similar pooling settings,but they are separated from each other with no communication.According to the analyses of geological features for gas accumulation in T₃χ,the main factors controlling massive gas accumulation are considered as the followings:1)development of alternating coal bed and sandstone combinations in a large open shallow-water lacustrine basin under gentle structural settings;2)the wide distribution of quality re-servoirs under the joint control of paleotectonics,sedimentary micro-facies and fractures in the Indo-Chinese epoch;3)overall uplifting of the Sichuan Basin at the end of the Cretaceous,gas expulsion through expansion,and reservoir compartmentalization.

Key words: massive accumulation, controlling factor, Xujiahe Formation, central Sichuan area, Sichuan Basin

CLC Number:

TE122.3

Bian Congsheng, Wang Hongjun, Wang Zecheng, Li Yongxin, Zhu Rukai, Liu Liuhong. Controlling factors for massive accumulation of natural gas in the Xujiahe Formation in central Sichuan Basin[J]. Oil & Gas Geology, 2009, 30(5): 548-555,565.

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Controlling factors for massive accumulation of natural gas in the Xujiahe Formation in central Sichuan Basin

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