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da niu di qi tian he 3 duan chen ji huan jing ji gao chan qi ceng chu ji te zheng
Author(s): 
Pages: 18-20
Year: Issue:  2
Journal: PETROLEUM GEOLOGY AND ENGINEERING

Keyword:  大牛地气田盒3段沉积相测井相高产特征;
Abstract: 大牛地气田位于陕-蒙交界处,鄂尔多斯盆地伊陕斜坡东部北段,该区上古生界广泛形成于加里东侵蚀面之上,沉积环境经历了由海到陆,由河到湖,由潮湿到干旱的古地理演化过程.下石盒子组盒3段即在这一大沉积背景下形成,主要发育干旱气候曲流河沉积.边滩是大牛地气田盒3段砂岩主要沉积类型,边滩中下部箱形段砂岩岩石类型主要为含砾粗粒岩屑(岩屑石英)砂岩、砂砾岩,碎屑颗粒较粗,分选磨圆较好,矿物成熟度高,石英含量一般大于85%.刚性颗粒石英含量高粒度粗,既增强了抗机械压实能力,又有利于原生孔隙的保存和次生孔隙的生成.孔隙类型多样,其中溶孔孔径较大,粒间溶孔孔径30~300 μm,最大可迭600μm,粒内溶孔孔径20~200 μm,在高产井储层砂岩中普遍发育.电性特征上,高产气层具有低自然伽马、中高电阻率、中高声波时差特征.
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