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沙三1 段是埕岛油田重要储集层之一 ,其储集层岩石学特征研究对该油田的滚动开发及勘探选区评价具有十分重要的指导意义。本文研究了沙三1 段储层沉积特征。研究认为 :⑴沙三1 段储集层为一套粗碎屑沉积岩 ,属河流 -滨浅湖沉积体系辫状河三角洲相 ,⑵块状层理粗砂岩相、槽状交错层理中细砂岩相、波状交错层理细砂岩相和平行层理细砂岩相为最有利的油气储集岩石相 ;Sf→Mm相组合、Sm→Mm相组合、St→Mm相组合以及Sr→Sh相组合是最发育的岩石相组合类型 ,也是最有利油气储集的岩石相组合 ,⑶物源方向主要为北东和西南 ;沉积相展布受构造控制 ,呈北北西 -南南东方向展布 ;沉积面貌具有西高东低、南高北低的沉积特征
Section 1 of Sha 3 is one of the important reservoirs in Chengdao Oilfield. The study of its reservoir petrological characteristics is of great guiding significance for the rolling development of the oilfield and the evaluation of the exploration constituency. In this paper, the reservoir sedimentary characteristics of the third member of Shahejie Formation are studied. The study shows that: (1) The reservoir in the 3rd member of Shasan III is a set of coarse clastic sedimentary rocks, which are braided river delta facies of river-shallow lake sedimentary system, (2) massive layered sandstone facies, Phase, wavy interlaced fine sandstone facies and parallel bedding fine sandstone facies are the most favorable oil and gas reservoir rock facies. The combinations of Sf → Mm, Sm → Mm, St → Mm and Sr → Sh are The most developed type of rock assemblage is also the combination of rock that is the most favorable oil and gas reservoir. (3) The source direction of the source rocks is mainly north-east and south-west. The depositional facies distribution is controlled by tectonics and is distributed in a north-northwest-south-south direction. Sediments The landscape has the features of low-west high and low-high south and low north