陕北盐盆马家沟组含盐系地层层序发育特征及地质意义  

Sequence Stratigraphy of Evaporites-bearing Ordovician Majiagou Formation in the Northern Shaanxi Saline Basin and Its Geological Significance

作　　者：王天云 张永生[2] 张建军[1] 孙佳传 丁清香[1] 李陶 侯艳 桂宝玲[2] WANG Tianyun;ZHANG Yongsheng;ZHANG Jianjun;SUN Jiachuan;DING Qingxiang;LI Tao;HOU Yan;GUI Baoling(Development and Production Seismic Division,BGP Inc.,CNPC,Zhuozhou 072750,China;Key Laboratory of Salt Lake Resources and Environmen,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]中国石油集团东方地球物理勘探有限责任公司新兴物探开发处,涿州072750 [2]中国地质科学院矿产资源研究所,国土资源部盐湖资源与环境重点实验室,北京100037

出　　处：《高校地质学报》2020年第5期549-558,共10页Geological Journal of China Universities

基　　金：国家重点研发计划课题(2017YFC0602806);国家自然科学青年基金(41702214)联合资助。

摘　　要：鄂尔多斯盆地中深部含盐系地层是中国陆相盐资源勘探开发的重点。在前人研究的基础上,文章采用Vail经典层序地层学理论,结合构造运动与海平面变化,通过对地震、测井资料的综合分析,应用井震结合技术,对古生界中奥陶统马家沟组地层开展层序地层研究,并进一步探究不同级别层序对含盐系地层发育形成的地质意义。研究结果表明,马家沟组地层划分为1个二级层序,3个三级层序,8个四级层序。二级层序(构造层序)和三级层序(沉积层序)共同影响含盐系地层平面及剖面发育特征。沉积作用(三级层序)控制原始盐体的形成;构造作用(二级层序)控制原始盐盆的形成,并对含盐系地层形态产生破坏、改造及调整。研究含盐系地层层序发育特征及其地质意义,能够为海相盆地中深层盐矿的进一步勘探开发提供方向和依据。The middle and deep evaporites-bearing strata in the Ordos Basin are highlighted for exploration and development of continental salt resources in China.On the basis of previous studies,the sequence stratigraphy of the middle Ordovician Majiagou Formation was studied by using seismic data,well logging data and Vail classical sequence stratigraphy theory.Tectonic movement and sea level change,and well seismic combination technology were adopted in the study.The development controls of the evaporite series stratigraphy were further explored.Results show that the Majiagou Formation is divided into 1 second-order sequence,3 third-order sequences and 8 fourth-order sequences.Based on the study of regional tectonic features and sedimentary facies,and in combination with the distribution of evaportie strata of the Majiagou Formation,it is considered that the second order sequence(structural sequence)and the third order sequence(sedimentary sequence)jointly affect the planar and vertical development of evaporite strata.Sedimentation(third order sequence)controls the formation of the original salt bodies.Tectonism(second order sequence)controls the formation of the original salt basin,and destorys,transforms and regulates the formation of the salt strata.The study of the sequence stratigraphy development and geological significance of evaporites-bearing strata can provide direction and basis for further exploration and development of middle and deep salt deposits in marine basins.

关 键 词：鄂尔多斯 陕北盐盆 奥陶系 马家沟组 层序 

分 类 号：P539.2[天文地球—古生物学与地层学]