华蓥溪口剖面中二叠统栖霞组沉积相分析

Analysis on Sedimentary Fades in the Qixia Formation, Middle Permian at Huaying Xikou Section

单长安 王胜涛 陈越 刘治成 张奇

SHAN Chang'an WANG Shengtao CHEN Yue LIU Zhicheng ZHANG Qi

西南石油大学资源与环境学院, 四川成都 610500; 延长油田股份有限公司, 陕西西安 717300; 中国石油西南油气田分公司勘探开发研究院, 四川成都 610051

Institute of Resources and Environment, Southwest Petroleum University, Chengdu Sichuan 610500, China; Yanchang Oilfield Co., Ltd, Xi'an Shanxi 717300, China; Research Institute of Petroleum Exploration & Development, SW Oil & Gas Field Co., Chengdu Sichuan 610051, China

在大量前人研究的基础上,通过野外实测,华蓥溪口剖面中二叠统栖霞组分为两段,总厚度115.11 m。该剖面岩石以石灰岩为主,含少量白云岩和硅岩。石灰岩进一步分为生屑微晶灰岩、泥晶灰岩、微晶生屑灰岩以及泥晶生屑灰岩。结合野外剖面、显微分析和区域沉积背景等资料的综合分析,认为栖霞组一段下部沉积环境为深缓坡的上带,栖霞组一段上部沉积环境为浅缓坡的上带,栖霞组一段顶部为局限台地亚相的泻湖微相,栖霞组二段沉积环境为开阔台地亚相的生屑滩微相和台内洼地微相。

Based on numerous previous researches and a lot of field surveys, the Qixia Formation of Middle Permian at Huaying Xikou section has been divided into two sections, with total thickness of 115.11 m. The rock types of this section are simple, dominated by limestones, with minor dolomites and siliceous rocks. The limestones can be further divided into bioclastic microcrystalline limestone, micritic limestone, microcrystalline bioclastic limestone and micritic bioclastic limestone. Based on the field section, microscopic analysis and a comprehensive analysis on the background of the regional deposition, it is believed that the depositional environment of the lower of the first section of Qixia Formation is upper part of deep ramp, the upper part is upper zone of shallow ramp, the top of the first section is lagoon face on restricted platform, the second section of Qixia formation is considered as open platform, including bioclastic beach microfacies and depression facies in platform.

国家油气重大专项课题"四川盆地大型天然气田富集规律、目标评价与勘探配套技术"(编号2008ZX05007-004)资助成果

https://doi.org/10.3969/j.issn.1008-2336.2012.03.044