地质科技情报2017，Vol.36Issue(6)：158-167,10.DOI:10.19509/j.cnki.dzkq.2017.0616
四川宣汉立石河剖面二叠系岩石特征及沉积环境分析
Petrological Characteristics and Sedimentary Environment of the Permian of Lishihe Section in Xuanhan, Sichuan
摘要
Abstract
As the basis for lithofacies paleogeography studies,the analysis of fundamental geological profiles is of great significance to oil and gas resources potential assessment.The Lishihe section in Xuanhan,Sichuan consists of Qixia Formation,Maokou Formation,Wujiaping Formation and Changxing Formation upwardly with the total thickness of 732.24 m.Rich in fossil types,this section has both algae-foraminifera-brachiopods fossil assemblage and the sponge spicules assemblage.The major rock type is limestone,with minor dolomites,cherts and siltstones.The eyeball-shaped limestone is mainly distributed in the bottom of Maokou Formation,as a product of both sedimentation and diagenesis.The dolomites are mainly found in the dolomite limestones formed by burial dolomitization and layered dolomites by mixed-water dolomitization.The cherts are distributed majorly in the upper Maokou Formation and the whole Wujiaping Formation,which are metasomatic originated,while the silicon comes from hydrotherm,basalt leaching and upwelling.According to the facies indicators,the study area should be a ramp carbonate platform environment in the Permian,and contains four types of sedimentary facies:coastal marsh,restricted platform,open platform and platform margin.The study area experienced two transgressive-regressive cycles in the Permian,one during the Qixia Formation to Maokou Formation depositional period,and the other in Wujiaping Formation to Changxing Formation period.Analysis on the petroleum geological conditions of this area shows that the Permian rocks can provide good source rocks and reservoirs.关键词
四川宣汉/二叠系/眼球状石灰岩/白云岩/沉积环境/石油地质条件Key words
Xuanhan, Sichuan/Permian/eyeball-shaped limestone/dolomite/sedimentary environment/petroleum geological condition分类
天文与地球科学引用本文复制引用
周新平,郑可,何幼斌,罗进雄..四川宣汉立石河剖面二叠系岩石特征及沉积环境分析[J].地质科技情报,2017,36(6):158-167,10.基金项目
中国石油化工股份有限公司海相油气勘探前瞻性项目“南方二叠系定量岩相古地理研究与油气预测”(YPH08019) （YPH08019）
国家科技重大专项(2017ZX05030003-003) （2017ZX05030003-003）
