Research on the sequence stratigraphy of the Shaximiao Formation in Chuanzhong-Chuanxi area, Sichuan Basin
Received date: 2019-12-26
Revised date: 2020-04-08
Online published: 2020-09-04
Fluvial facies is a significant type of hydrocarbon reservoirs in Mesozoic and Cenozoic continental basins in China, while the strata division of fluvial facies has always been a difficult theme. In Chuanzhong-Chuanxi area of Sichuan Basin, Shaximiao Formation developed fluvial facies. Based on the theory of continental high resolution sequence stratigraphy, combined with the principle of point-line-plane, this paper attempted to carry out sequence stratigraphy research on Shaximiao Formation. The results showed that: (1) Shaximiao Formation can be divided into three third-order base-level cycles and five fourth-order base-level cycles. The five fourth-order base-level cycles respectively corresponded to the first member, section 1 in second member, section 2 in second member, section 3 in second member, section 4 in second member of the Shaximiao Formation. (2)The base-level cycle affected the development and superimposed pattern of the source channel. When the base-level was high, the accommodation space was large, the strata got deposited quickly, and the channel was relatively spatial independent with small scale, the mudstone content was large. Differently, when the base-level was low, the strata got deposited slowly, the channel migrated frequently and incised each other, resulting in the formation of large scale channel, and the content of mudstone was relatively low. The sequence stratigraphic classification of Shaximiao Formation not only provided a high resolution isochronous stratigraphic framework, but also has a function of reservoir prediction, which is of great significance for gas exploration and development of the Shaximiao Formation.
Fu-sen XIAO , Teng-qiang WEI , Xiao-juan WANG , Xu GUAN , Chang-jiang WU , Hai-tao HONG . Research on the sequence stratigraphy of the Shaximiao Formation in Chuanzhong-Chuanxi area, Sichuan Basin[J]. Natural Gas Geoscience, 2020 , 31(9) : 1216 -1224 . DOI: 10.11764/j.issn.1672-1926.2020.04.023
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