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通过大量的铸体薄片、扫描电镜、阴极发光、粘土矿物、X-射线衍射等分析化验资料,对渤南洼陷北部陡坡带砂砾岩储层成岩作用类型、主要影响因素进行了分析,同时划分了成岩演化阶段,并在此基础上分析了成岩相类型和不同成岩相对储层质量的控制作用。研究结果表明,渤南洼陷北部陡坡带沙三下亚段和沙四段砂砾岩储层主要处于中成岩阶段A1期和中成岩阶段A2期,对应于有机质热演化的主要生油气阶段。压实作用是使储层质量变差的最主要原因,胶结作用次之,粘土矿物溶解是使储层物性变好的最主要成岩作用。研究区共发育强压实固结成岩相、晚期碳酸盐胶结成岩相、弱压实弱胶结成岩相和不稳定组分溶蚀成岩相4种类型,各类成岩相均对储层物性起一定的控制作用,现今储层特征为4种成岩相综合作用的结果。不稳定组分溶解成岩相形成了最好的储层,弱压实弱胶结成岩相储层的物性较好,强压实固结成岩相和晚期碳酸盐胶结成岩相形成的储层物性较差。
The diagenesis types and main influencing factors of glutenite reservoirs in the steep slope belt in the north of Bonan Sag are analyzed by a large number of cast thin films, scanning electron microscopy, cathodoluminescence, clay minerals and X-ray diffraction analysis. Meanwhile, The diagenetic evolution stage, and on this basis, analyzes the diagenetic facies and different diagenetic relative reservoir quality control. The results show that the gravelly reservoirs of the Es3 and Es4 rocks in the northern steep slope belt of Bonan Sag are mainly located in the stages A1 and M2 of middle diagenesis, corresponding to the main hydrocarbon generation stage of organic matter thermal evolution. Compaction is the main reason for the deterioration of reservoir quality, followed by cementation. Clay mineral dissolution is the most important diagenesis to make reservoir properties better. In the study area, there are four types of strongly compacted and solidified diagenetic facies, late carbonate cemented facies, weakly compacted and weakly colloidal diagenetic facies, and unstable component diagenetic facies. All types of diagenetic facies play a certain role in reservoir physical properties The current reservoir characteristics are the result of the combined action of four diagenetic facies. The unstable components dissolve into diagenetic facies to form the best reservoirs, and the properties of weakly compacted weakly cemented diagenetic facies are better. The properties of the reservoirs formed by strong compaction consolidation diagenesis and later carbonate cementation are more difference.