石油与天然气地质 ›› 2011, Vol. 32 ›› Issue (3): 388-396.doi: 10.11743/ogg20110311

• 石油与天然气地质 • 上一篇    下一篇

鄂尔多斯地区东北部大牛地气田山西组沉积相

  

  • 出版日期:2011-06-28 发布日期:2011-09-23

Sedimentary facies of the Shanxi Formation in Daniudi gas field,northeastern Ordos area

  • Online:2011-06-28 Published:2011-09-23

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1063

被引次数

46

摘要：

摘要：应用宏观与微观地质证据相统一的沉积相分析方法，对研究区300余口井的录井、测井资料进行解释和对比，同时结合岩石组合、沉积构造、剖面结构、测井相组合以及华北地区晚石炭世—早二叠世克拉通盆地区域地质背景，分析了山西组的岩性组合及展布特征。研究认为,山西组一段沉积期为陆表海沉积环境，海相化石是有力的证据，同时研究区曾经经历海侵，沉积了滨海三角洲体系；山西组二段沉积期为陆表海向陆内坳陷的转换期，满蒙洋壳向华北板块俯冲加剧，板块北部继续翘起，研究区内海水基本退出，因此山西组二段沉积了近海三角洲体系。山西组一段以陆表海的三角洲前缘沉积为主，主要发育水下分流河道、水下分流间湾和泥炭沼泽;山西组二段以三角洲平原沉积为主，主要发育分流河道、分流间湾。通过有利区带分析，确定了水下分流河道、分流河道的下部为有利的储集相带。

关键词: 关键词：分流河道, 三角洲沉积体系, 储集相带, 陆表海, 大牛地气田, 鄂尔多斯盆地

Abstract:

Abstract:Based on interpretation and correlation of logging data over 300 wells and in combination with rock assemblage,sedimentary structure,profile structure,electrofacies combinations,and the regional geological settings of the Late Carboniferous〖KG-*4〗-Early Permian carton basin in North China,this paper analyzes the lithologic association and distribution characteristics of the Shanxi Formation by using the sedimentary facies analysis technique that unifies macroscopic and microscopic geological evidence.The first member of Shanxi Formation was deposited in an epicontinental environment as evidenced by marine fossils.The study area experienced marine transgression,leading to the deposition of shore delta systems.The second member of Shanxi Formation was deposited during the transition from epicontinental sea to intracontinental depression,when the subduction of Manchuria and Mongolia oceanic crust to the North China plate intensified and the tilting of the northern part of the plate continued,leading to the almost complete regression of sea water from the study area and the deposition of offshore delta system.The first member of Shanxi Formation is dominated by epicontinental sea delta front deposits and its sedimentary facies mainly include underwater distributary channel,bay between underwater distributary channels and peat swamps.In contrast,the second member is dominated by delta plain deposits and its sedimentary facies mainly include distributary channel and bay between distributary channels.The underwater distributary channel and the lower distributary channel are favorable reservoir facies.

Key words:  , Key words：distributary channel,delta deposition system,reservoir facies,epicontinental sea,Daniudi gas field,Ordos Basin