鄂尔多斯盆地神木气田太原组沉积特征与演化  

Sedimentary Characteristics and Evolution of the Upper Carboniferous Taiyuan Formation,Shenmu Gasfield,Northeastern Ordos Basin

作　　者：兰朝利[1] 张君峰[2] 陶维祥[3] 张永忠[4] 杨明慧[5] 王金秀[5] 

机构地区：[1]中国石油大学石油工程教育部重点实验室,北京102249 [2]中国石油天然气股份有限公司,北京100001 [3]中国海洋石油总公司中海石油研究中心,北京100027 [4]中国石油勘探开发研究院廊坊分院,河北廊坊065007 [5]中国石油大学油气资源与探测国家重点实验室,北京102249

出　　处：《地质学报》2011年第4期533-542,共10页Acta Geologica Sinica

基　　金：国家科技重大专项(编号2009ZX05009);国家重点基础研究规划"973"项目(编号2003CB214602);中国石油天然气集团公司石油科技中青年创新基金项目(编号04E7023)资助成果

摘　　要：鄂尔多斯盆地东缘的神木气田太原组为特征性的碎屑岩与碳酸盐岩互层含煤岩系。近期天然气勘探证实其具有良好的开发潜力。为指导神木气田太原组开发和盆地太原组储层勘探,根据测井、录井、常规薄片、铸体薄片、物性和粒度资料,结合岩芯描述,研究了神木气田太原组地层组合、沉积特征、沉积环境演化、砂体宽度以及沉积相对储层控制作用。太原组地层发育了碎屑岩型、灰岩型和互层型3种组合。地层颜色、粒度、成分、结构、沉积构造、岩石相、测井相、含有物以及沉积序列特征反映其为潮控三角洲与低能碳酸盐台地沉积,主要发育三角洲平原分流河道、分流间洼地微相,三角洲前缘远砂坝、分流间湾微相,以及碳酸盐灰坪、灰泥坪微相。太原组下部（太二段）以三角洲平原沉积为主,分流河道砂体发育,但宽度较窄（7.1~131.9 m）,上部太一段为三角洲前缘与碳酸盐潮坪沉积,反映其经历了一个沉积水体总体逐渐加深的海侵过程和/或碎屑供应逐渐减少的沉积过程,而太一段碎屑岩与灰岩的互层沉积则反映了太原组晚期沉积水体的振荡性加深→变浅和/或陆源碎屑供应的周期性缺乏。储层主要发育在太二段高能量的三角洲平原分流河道中、粗砂岩中。The Upper Carboniferous Taiyuan Formation is a characteristic coal-bearing seam interbedded with terrigenous siliciclastic and carbonate rock in the Shenmu gasfield of northeastern Ordos basin,central China.Recent exploration shows its good potential for further gas development.To offer guidance for exploitation of Taiyuan Formation in this gas field as well as the Ordos basin,the strata assemblages,sedimentary characteristics,environment evolution,sandbody width and sedimentary facies control on reservoirs of Taiyuan Formation were investigated based on analysis of well-logging,mud-logging,routine thin-section,cast thin-section,routine petrophysical property and grain size and core description.The Taiyuan Formation develops three types of strata assemblages,including clastic rock type,limestone type,and interlayer of clastic rock and limestone type.The color,grain size,composition,texture,sedimentary structure,lithofaices,log facies,inclusion and depositional succession of Taiyuan Formation indicate that it deposited in tide-dominated delta and low-energetic carbonate platform,within which deltaic plain distributary channels and interdistribuarty swales,deltaic front distal bars and underwater interdistribuary bay,and lime tidal flat and lime-mud tidal flat developed.The lower section of Taiyuan Formation（the 2nd Member of Taiyuan Formation,SMTF in short） is dominated by deltaic plain deposits,in which distributary channel sandbody is widely spread but relatively narrow in width（7.1~131.9 m）.The upper section（the 1st Member of Taiyuan Formation,FMTF in short） deposited in deltaic front and carbonate tidal flat.This implies that the Taiyuan Formation passed through a transgressive process with gradually deepening of water depth and/or a depositional process with gradually decreasing of clast supply.The interlayers of clastic rock and carbonate rock in the FMTF reflects an oscillating process from water-depth deepening to shallowing and/or a kind of cycling insufficiency of terrigenous clastic supply.T

关 键 词：沉积特征 沉积环境演化 潮控三角洲 低能碳酸盐台地 太原组 神木气田 

分 类 号：P618.13[天文地球—矿床学]