四川盆地西部晚三叠世海相碳酸盐岩—碎屑岩的转换过程

doi:10.11743/ogg20090505

Abstract

Abstract:

Based on study of the features of distribution,lithofacies and palaeontology of the Upper Triassic Maantang Fm.and its bioherm as well as their provenience,this paper suggests that the distribution area and extinction of the bioherms in the Maantang Fm.be controlled by the Late Triassic transition from marine carbonates to marine clastics.The clastics of the marine strata in western Sichuan Basin were mainly sourced from the northern Qinlin area.The clastic input beginning in the Carnian increased in amount progressively and spread from north to south.It is indicated that the formation and uplifting of Longmen Mountain is a progressive process from north to south and is controlled by the formation and evolution of Qinling orogenic zone.The transition is critical to the structural evolution of the superimposed Sichuan Basin and constrained the development of marine source rocks in the Maantang Fm and the development sequence of the bioherms.The Maantang Fm is worthy of further exploration as high energy reefs might have developed in areas near the central Sichuan Basin.

Key words: Maantang Formation, transition of marine deposit, bioherm, petroleum exploration, Later Triassic, Western Sichuan Basin

CLC Number:

TE121.3

Liu Shugen, Yang Rongjun, Wu Xichun, Sun Wei, Chen Yang. The Late Triassic transition from marine carbonate rock to clastics in the western Sichuan Basin[J]. Oil & Gas Geology, 2009, 30(5): 556-565.

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The Late Triassic transition from marine carbonate rock to clastics in the western Sichuan Basin

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