四川盆地二叠系长兴组生物礁发育的差异性及控制因素

doi:10.11743/ogg20200606

Abstract

Abstract:

The development characteristics of the reefs in the Permian Changxing Formation in the Sichuan Basin are systematically studied to determine the differences of the reefs developed in the same formation of different plays through observation of outcrops and cores as well as experiments.The results show that the reefs from different plays vary in the development stage from nil to as much as four stages of development; in the completeness of reef cycles, including the differences in cycles of the same location but of different stages or the same cycle but of different locations; in lithofacies and biological assemblages; and in reef spatial distribution, including a banded distribution of multiple rows, dispersed distribution, single-row distribution and ring distribution.Based on the results, we proposed four factors controlling the reef development, i.e., the palaeogeomorphology determines the location and morphology; the palaeoenvironment controls the development stages and the integrity; the palaeobathymetry (sea-level changes) controls the reef assemblages and cyclicity; and the palaeontology controls the reef composition and integrity.

Key words: palaeontology, reef, Changxing Formation, palaeobathymetry, palaeogeomorphology, palaeoenvironment, Sichuan Basin

CLC Number:

TE122.1

Deqin Ma, Jingchun Tian, Xiaobing Lin, Long Wen, Liang Xu. Differences and controlling factors of Changxing Formation reefs of the Permian in the Sichuan Basin[J]. Oil & Gas Geology, 2020, 41(6): 1176-1187.

Figures/Tables 11

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Differences and controlling factors of Changxing Formation reefs of the Permian in the Sichuan Basin

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