滇黔桂盆地桂中坳陷下石炭统台槽相页岩沉积特征与沉积模式  

Sedimentary characteristics and model of platform-trough shale in the Lower Carboniferous,Guizhong Depression,Dianqiangui Basin

作　　者：陶金雨 胡宗全[5] 申宝剑[1,2,3,4] 潘安阳 李楚雄[1,2,3,4] 王瑞湖 张美玲 Tao Jinyu;Hu Zongquan;Shen Baojian;Pan Anyang;Li Chuxiong;Wang Ruihu;Zhang Meiling(Wuxi Research Institute of Petroleum Geology,Petroleum Exploration and Production Research Institute,SINOPEC,Wuxi,Jiangsu 214126,China;State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Wuxi,Jiangsu 214126,China;State Energy Center for Shale Oil Research and Development,Wuxi,Jiangsu 214126,China;Key Laboratory of Petroleum Accu-mulation Mechanisms,SINOPEC,Wuxi,Jiangsu 214126,China;Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China;The Institute of Geological Survey of Guangxi Zhuang Autonomous Region,Nanning,Guangxi 530022,China)

机构地区：[1]中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214126 [2]页岩油气富集机理与有效开发国家重点实验室,江苏无锡214126 [3]国家能源页岩油研发中心,江苏无锡214126 [4]中国石油化工集团公司油气成藏重点实验室,江苏无锡214126 [5]中国石化石油勘探开发研究院,北京100083 [6]广西壮族自治区地质调查院,广西南宁530022

出　　处：《石油与天然气地质》2022年第2期365-377,共13页Oil & Gas Geology

基　　金：联合基金项目集成项目(U19B6003);国家自然科学基金项目(42002136);国家科技重大专项(2017ZX05036-002-003)。

摘　　要：通过对典型井观察描述、野外剖面实测以及室内测试分析,对桂中坳陷下石炭统鹿寨组页岩的沉积特征进行解剖,建立台槽相页岩沉积模式,并提出具有页岩气勘探潜力的优势相带。对比四川盆地五峰组-龙马溪组陆棚相页岩与研究区台槽相页岩的沉积特征,明确台槽与陆棚的差异性。研究区台槽沉积的典型相标志除了页理、变形、粒序等层理构造之外,槽内普遍富集大量黄铁矿,台-槽斜坡带可识别出灰质和硅质两种浊流、腕足等古生物碎片以及若干植物碎片。根据岩性组合、相标志、水动力等条件,台槽相共划分出4种亚相及13种岩相。其中,台盆亚相的硅质岩相和硅质页岩相以及下斜坡亚相的泥质硅质岩相和炭质泥岩相可作为优势相带,含有少量灰质和泥质的硅质岩更具页岩气勘探潜力。The sedimentary characteristics of shale in the Lower Carboniferous Luzhai Formation,Guizhong Depression are discussed based on observation and description of cores from typical wells,outcrop observation and laboratory tests.A sedimentary model of the platform-trough facies is thereby established,and the potential zones favorable for shale gas exploration are proposed.In comparison,the differences between shales of shelf facies(as represented by the Wufeng-Longmaxi shale,Sichuan Basin)and platform-trough facies(as represented by shale in the study area)are clarified.In addition to facies markers of lamellation,deformation,and grain sequence typical of the bedding structure,large amount of pyrites are widely enriched in the trough.A calcareous and a siliceous turbidites,paleontological fragments like brachiopods together with some plant fragments,could be identified in the slope between platform and trough.According to the lithologic combination,facies markers and other hydrodynamic conditions,platform-trough facies could be subdivided into 4 subfacies and 13 types of lithofacies.Among others,the siliceous lithofacies and siliceous shale lithofacies in the platform-trough facies,together with the argillaceous siliceous lithofacies and carbonaceous mudstone lithofacies in trough slope subfacies,could be of the potential facies belts for shale gas exploration.The siliceous rocks with some lime and shale contents can be of potential targets for shale gas exploration.

关 键 词：台槽相 沉积模式 页岩 下石炭统 桂中坳陷 滇黔桂盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]