鄂尔多斯盆地东缘大宁—吉县地区山西组页岩岩相与沉积相特征  

Shale Lithofacies and Sedimentary Facies of the Permian Shanxi Formation, Daning-Jixian Area, Eastern Margin of Ordos Basin

作　　者：彭思钟 刘德勋[2] 张磊夫 邱振[2] 王以城 封从军[1] 孙萌思 PENG SiZhong;LIU DeXun;ZHANG LeiFu;QIU Zhen;WANG YiCheng;FENG CongJun;SUN MengSi(State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an 710069,China;CNPC Research Institute of Petroleum Exploration and Development,Beijing 100083,China;School of Petroleum Engineering and Environmental Engineering,Yan’an University,Yan’an,Shaanxi 716000,China)

机构地区：[1]西北大学地质学系大陆动力学国家重点实验室,西安710069 [2]中国石油勘探开发研究院,北京100083 [3]延安大学石油工程与环境工程学院,陕西延安716000

出　　处：《沉积学报》2022年第1期47-59,共13页Acta Sedimentologica Sinica

基　　金：中石油股份公司重大科技专项(2020E-31);陕西省自然科学基础研究计划项目(2020JQ-798,2017JM4013)~~。

摘　　要：以鄂尔多斯盆地东缘大宁—吉县地区二叠系山西组为研究对象,综合应用岩心、薄片及测井资料,开展山32亚段岩相类型、岩相组合和沉积相研究,研究结果表明:山32亚段包括粉砂质泥岩/页岩相、纹层状层理含粉砂泥岩/页岩相、透镜状层理粉砂质泥岩/页岩相、钙质页岩相、煤层、碳质页岩相、黑色页岩相、波状层理泥质粉砂岩相、交错层理中—细砂岩相和中砂岩相共10种岩相类型;可划分为4种岩相组合,分别反映了潮坪(潮上带/潮间带)沉积,潟湖沉积,潮汐水道—潮坪沉积和潟湖—潮坪沉积。研究区属于海陆过渡相沉积环境,中部为潟湖沉积,西南部以及东部有2个障壁岛砂坝沉积的区域,障壁岛及北部三角洲前缘向湖方向过渡为潮坪。潟湖相和潮坪(潮上带/潮间带)是生气最有利的沉积相组合。A systematic study was conducted using cores,rock thin sections and drill logging data to identify lithofacies in the Daning-Jixian region of the Shanxi Formation and establish their association and sedimentary facies. Ten types of lithofacies were identified:massive silty mudstone or shale,silt-bearing mudstone or shale with small ripples,silty mudstone or shale with lenticular bedding,calcareous shale,coal,carbonaceous shale,black shale,muddy siltstone with wave bedding,middleto fine sandstone with tidal cross-bedding,and massive middle size sandstone. In additon,ten lithofacies were classified into four associations that reflect four depositional environments:tidal flat deposits(supratidal to intertidal zones),lagoon deposits,tidal channel to tidal flat deposits and lagoon-tidal flat deposits. The study area lies within a marine-continental transitional facies sedimentary environment,the central part is a lagoon deposit,the southwestern and eastern parts comprise two barrier islands and a sand bar deposition area and barrier island,and in the north,a delta front transitioning to a tidal flat in the direction of the lake. The lithofacies association in the deep lagoon and tidal flat deposits(supra/intertidal zones)are favorable for the development of a high-TOC shale gas reservoir.

关 键 词：鄂尔多斯盆地 页岩 岩相 岩相组合 海陆过渡相 

分 类 号：P618.13[天文地球—矿床学]