Diagenesis and Pore Evolution of Gravityflow Channel Sandbody in Shahejie Formation, Qinan Depression
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摘要: 储层物性既受沉积相平面分区性的控制，又受成岩作用的垂向分带性的控制。因此，根据不同地质背景与微相类型，建立具体的成岩作用模式，对储层评价具有指导作用。本文在分析歧南地区沉积相平面展布和垂向层序特征的基础上，对该地区沙河街组的42块样品进行铸体薄片、扫描电镜、阴级发光、X衍射、古地温分析，总结了重力流主水道砂体和重力流水道侧翼、水道末梢砂体的成岩作用特征以及孔隙演化模式，指出在进行重力流水道砂体进行勘探部署时，应选择主水道中心部位进行钻探。Abstract: Sedimentary facies controls plane distribution of reservoir and diagenesis controls its vertical zonation. Establishing detailed diagenesis pattern according to distinctive geology background and microfacies types is crucial for reservoir evaluation. In this paper, according to the analyses of sedimentary facies distribution and vertical sequence, by using rock thin sections, scanning electron microscope (SEM), cathodoluminescence, Xdiffraction, paleogeotemperature for the 42 sandstone samples of Shahejie Formation, it is summarized that there are 2 types of diagenesispore evolutions model ,i.e. main gravityflow channel sandbodies，and flankdistal sandbodies of gravityflow channel, which indicating that the center part of the main gravityflow channel sandbodies is potential exploration targets.
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Key words:
- gravityflow channel sandbody /
- diagenesis /
- pore evolution pattern
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