川西地区中二叠统栖霞组沉积体系

doi:10.11743/ogg20100407

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川西地区中二叠统栖霞组沉积体系
Depositional system of the Middle Permian Q ixia Formation in the western Sichuan Basin
2010年31卷第4期页码：442-448
网络首发：2010-08-28，

纸质出版：2010
DOI： 10.11743/ogg20100407
稿件说明：

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川西地区中二叠统栖霞组沉积体系[J]. 石油与天然气地质, 2010,31(4):442-448. DOI： 10.11743/ogg20100407.

Depositional system of the Middle Permian Q ixia Formation in the western Sichuan Basin[J]. 2010, 31(4): 442-448. DOI： 10.11743/ogg20100407.

摘要

通过对川西地区中二叠统栖霞组大量露头和岩心的观察分析及样品的分析化验，认为栖霞组主要发育生物（屑）石灰岩、砂屑石灰岩、泥晶石灰岩和豹斑石灰岩;主要发育3种生物组合，即腕足类-藻类-有孔虫类组合、珊瑚组合和薄壳腕足类组合，它们分别是台地、斜坡和斜坡-盆地环境的产物。从大地构造背景、台地边缘滩特征、斜坡-盆地相特征及斜坡相与台地边缘相带的关系等方面分析，认为川西地区栖霞组为碳酸盐镶边台地沉积体系，主要的沉积相为斜坡相、台地边缘滩相和开阔台地相;其中，台地边缘滩相是栖霞组重要的储层，分布范围广。

Abstract

Observation and analysis of numerous outcrops and cores as well as laboratory tests of samples from the Qixia Formation in western Sichuan Basin reveal that the formation mainly consists of bioclastic limestone，calcarenite， micrite，and leopard limestone. There are mainly three fossil assemblages，including brachiopodsˉalˉgaeforaminifera，corals and thin shell brachiopods. They were formed in platform，slope and slopeˉbasin environments respectively. Judging from geotectonic settings，bank features of platform edge and slopeˉbasin facies，and the relationship between slope facies and platform edge facies etc，we conclude that the Qixia Formation in western Sichuan Basin is the carbonateˉfringed platform depositional system with slope，platform edge bank and open platform as the main facies，of which the platform edge bank facies is widely distributed and the most favorable for hydrocarbon accumulations.