摘要
为了揭示鄂尔多斯盆地马家山—小涧子油田砂岩成岩作用对储层的控制作用,综合采用了薄片鉴定、铸体薄片、压汞、扫描电镜、X-射线衍射和包裹体分析等多种方法。研究认为:该区延长组长61、长4+5段砂岩成岩作用进入了中成岩阶段的A期;成岩相的平面分布具有明显的规律性,由水下分流河道砂体及河口砂坝中心向边缘,直至水下分流间湾,依次发育溶蚀孔隙相、绿泥石胶结相、碳酸盐胶结相及压实杂基相4种成岩相类型;储层物性依次变差;有利的储集相带为水下分流河道砂体和河口砂坝中心的溶蚀孔隙相和绿泥石胶结相。
Integrated methods, including thin section identification, cast thin section examination, mercury penetration, scanning electron microscopy （SEM）, X-ray diffraction （XRD） and fluid inclusion analysis, were used to reveal the controls of sandstone diagenesis in the Majiashan-Xiaojianzi oilfield on reservoirs. Study indicates that the diagenesis of sandstone of the Chang 61 and Chang 4＋5 members in the Yanchang Formation has reached stage A of the middle diagenetic phase. The distribution of diagenetic facies exhibits a distinctive regularity： dissolution pore facies, chlorite cement facies, carbonate cement facies and compact matrix facies occur in succession from the sand bodies of subaqueous distributary channels and center of river mouth sandbars to margins and down to the subaqueous distributive bay. The physical properties of sandstone become poor successively. The favorable reservoirs are dissolution pore facies and chlorite cement facies in the sand bodies of subaqueous distributary channels and center of river mouth sandbars.
出处
《中国地质》
CAS
CSCD
2007年第2期283-288,共6页
Geology in China
基金
国家重点基础研究发展规划项目(2003CB214603)资助
关键词
鄂尔多斯盆地
延长组
砂岩储层
成岩作用
成岩相
Ordos basin
Yanchang Formation
sandstone reservoir
diagenesis
diagenetic facies
