【作者】 张彤；

【导师】 邱隆伟；

【作者基本信息】 中国石油大学 ， 地质学， 2011， 硕士

【摘要】 八面河地区位于东营凹陷南斜坡东段,是东营凹陷的油气富集区带之一,沙河街组是主要的含油层系。本论文在前一阶段研究所建立了的沙河街组层序地层格架的基础上,对整个沙河街组的沉积体系展布和演化、储层特征进行了系统研究,为下一步勘探开发提供指导。研究区沙河街组地层划分为6个三级层序,除SQ3为二分层序外,其他层序都为三分层序,根据岩性组合变化及叠置关系对各个层序地层进一步细分,划分为32个准层序组。通过详细的岩心观察,在岩石类型及其组合、沉积构造、相序、古生物发育特点等综合研究的基础上,认为研究区主要发育了滨浅湖滩坝沉积、三角洲沉积和碳酸盐岩滩等沉积类型。滨浅湖滩坝沉积和碳酸盐滩沉积主要发育在SQ1、SQ2时期(沙四段),滩坝沉积主要分布于南部缓坡带,盆地边缘见砾石滩沉积;碳酸岩滩主要分布于研究区西北部,其它部位发育规模相对较小。三角洲沉积从沙四晚期开始一直向西部推进,规模不断加大,SQ4、SQ5(沙三段)沉积时期达到鼎盛,基本覆盖整个研究区。SQ6(沙一段、沙二段)地层受到剥蚀,地层较薄。SQ6低位域和湖侵域沉积时期,物源供应充足,三角洲砂体仍覆盖全区,仅在局部发育水下支流间湾沉积;SQ6-HST(沙一段)沉积时期,水体加深,物源影响减弱,三角洲覆盖面积变小,三角洲前缘发育滨浅湖沉积。八面河地区的储集相带主要为滨浅湖滩坝、碳酸盐滩坝和三角洲沉积,储层以高孔-特高孔、中-高渗型为主。孔隙度和渗透性呈正相关。储层特征研究表明埋藏深度、成岩作用和沉积相是影响孔隙结构的主要因素。八面河地区陆源碎屑岩储层的物性明显好于碳酸盐岩储层,而对于前者来说粗粒级的储层性质随深度的变化明显优于细粒级储层,三角洲前缘砂体的孔隙度和渗透率普遍高于湖相的滩坝砂体。更多还原

【Abstract】 Bamianhe area is located in eastern South Slope of Dongying Depression. As one of the enrichment zones of oil and gas,Shahejie formation is its major oil and gas formation. The purpose of this thesis is to build the sequence stratigraphic framework of Shehejie formation,and take into stratum structure,depositional system and other research of the key layer. The research results can provide guidance on the next step of oil and gas exploration and development.On the basis of the stratigraphic character,we can divided Shahejie Formation into six third-order sequences. SequenceⅢcan be subdivided into transgressive and regressive systems tract. Other third-order sequence can be subdivided into lowstand systems tract,transgressive systems tract and highstand systems tract. According to the observation of the cores,the study on the types and combinations of rock,sedimentary structures,facies sequence,features of paleontology facies analysis of single well,found that Bamianhe area developed beach-bar,delta and carbonate beach.Beach-bar sedimentary body mainly developed in Es4.Then material source of supply is to strengthen, the delta is dominated in the sedimentary facies.With the delta continue to advance from east to west,the delta surfaces fully developed during the next periods.Beach-bar,delta and carbonate beach are the main sedimentary facies for reservoir.Reservoir is high-super porosity and mid-high permeability.The relationship of porosity and permeability is positive,which indicates that porosity development control the permeability.The research above suggest that the factors control reserovir are sedimentary facies,diagenesis and tectonics.更多还原