四川盆地广安地区中二叠统栖霞组岩石特征与沉积环境

doi:10.13278/j.cnki.jjuese.20190266

摘要/Abstract

摘要： 四川盆地中二叠统栖霞组勘探发现系列油气，资源潜力巨大。但广安地区中二叠统栖霞组的岩石学特征及沉积环境研究薄弱。在野外地质调查的基础上，结合室内岩石学、岩相学等综合分析，对广安地区栖霞组碳酸盐岩岩石特征、沉积相类型及其古地理展布特征进行了系统研究。结果表明：广安地区栖霞组主要发育亮晶颗粒灰岩、亮晶生物碎屑灰岩、微晶生物碎屑灰岩、微晶颗粒灰岩、生物碎屑微晶灰岩、含生物碎屑微晶灰岩和泥晶灰岩7种岩石类型；碳酸盐岩颗粒主要以生物碎屑为主，部分层位发育球粒；古生物化石以三叶虫、腕足和有孔虫为主，同时可见棘皮类和藻类；栖霞组沉积期主要为碳酸盐岩台地沉积环境，其中栖霞组晚期（栖二段）台缘滩和台内滩较为发育，为该区油气成藏提供了有利条件。

关键词: 岩石类型, 沉积环境, 栖霞组, 广安地区, 四川盆地

Abstract: A series of petroleum exploration discoveries have been made in Qixia Formation of Middle Permian in Sichuan basin, which has great resource potential. However, the previous research on the petrological characteristics and sedimentary environment of Middle Permian Qixia Formation in Guang'an area is weak. On the basis of geological survey, combined with petrology and petrography, the authors studied the carbonate rock characteristics, sedimentary facies types,and paleo-geographical distribution characteristics of Qixia Formation. The result shows that there are seven rock types developed in Qixia Formation in Guang'an area, including sparry bioclastic limestone, sparry granular limestone, microcrystalline bioclastic limestone, microcrystalline granular limestone, biofragmentary microcrystalline limestone, biofragmentary microcrystalline limestone containing biofragmentary microcrystalline limestone, and micritic limestone. The carbonate grains are mainly bioclastic, and spherules in some layers. Paleontological fossils are mainly trilobites, brachiopods, foraminifera, as well as echinoderms and algae. In the deposition period of Qixia Formation, the depositional environment was mainly a carbonate platform; in the later stage of Qixia Formation (Member 2), the marginal-platform shoals and intra-platform shoals were well developed, which provides favorable conditions for hydrocarbon accumulation in this area.

Key words: rock types, sedimentary environment, Qixia Formation, Guang'an area, Sichuan basin

中图分类号:

P588.2

易海永, 崔宝琛, 王瑶琳, 邱玉超, 徐胜林, 李乾. 四川盆地广安地区中二叠统栖霞组岩石特征与沉积环境[J]. 吉林大学学报(地球科学版), 2020, 50(2): 454-464.

Yi Haiyong, Cui Baochen, Wang Yaolin, Qiu Yuchao, Xu Shenglin, Li Qian. Petrological Characteristics and Sedimentary Environment of Qixia Formation in Guang’an Area, Sichuan Basin[J]. Journal of Jilin University(Earth Science Edition), 2020, 50(2): 454-464.

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