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对沾化凹陷沙河街组不同分布模式的砂岩透镜体内部和表面砂岩和泥岩的密集采样进行了薄片、X射线衍射、扫描电镜和阴极发光分析,探讨了砂泥岩界面附近与透镜体内部的碳酸盐胶结作用的差异及其成因。研究表明,这种差异随透镜体的埋藏深度以及砂岩、泥岩各自的厚度变化而变化。无论是孤立式透镜体,还是叠加式透镜体,当砂体厚度超过2m、泥岩厚度超过5m时,砂、泥岩界面的晚期碳酸盐胶结程度高于砂体内部。透镜体在埋藏过程中形成的大量次生孔隙,以及晚期成岩作用阶段砂泥岩之间存在的单向或双向流体(物质)传递,是晚期碳酸盐矿物能否在透镜体表面(或薄砂体内部)大量胶结的重要条件。
X-ray diffraction, scanning electron microscopy (SEM) and cathodoluminescence were used to analyze the intensive sampling of sandstone and mudstone in sandstone and mudstone with different distribution patterns in Shahejie formation of Zhanhua sag. Differences and Causes of Acidite Bonding. Research shows that this difference varies with the depth of burial of the lens body and the thickness of sandstone and mudstone. No matter whether it is an isolated lens body or a superposition lens body, when the thickness of sand body exceeds 2m and the thickness of mudstone exceeds 5m, the late carbonate cementation of sand and mudstone interface is higher than that of sand body. The large number of secondary pores formed by the lens during burial and the unidirectional or bidirectional fluid (matter) transfer between sandstone and mudstone in the late stage of diagenesis is the result of whether the late carbonate mineral can be transported on the lens surface Body internal) a lot of important conditions of cementing.