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对盖层形成和发育的有利地质因素进行了深入分析。盆地内的凹陷区是泥质岩盖层发育的最有利地区;盆地相对下沉的最大水进期是泥质岩类盖层发育的最有利时期。槽盆相、浅海陆棚相和半深湖-深湖相环境往往发育高质量的区域性盖层;滨浅湖相、台地相、台地边缘相、三角洲相和河流相等环境只能发育质量相对较差的局部盖层;泻湖相和潮坪相既可形成高质量的区域性盖层,又可形成质量相对较差的局部盖层。处于中成岩阶段至晚成岩阶段A亚期的泥质岩盖层封闭能力最强。
In-depth analysis of the favorable geologic factors of caprock formation and development. The depression in the basin is the most favorable area for mudstone caprock development. The maximum relative waterfall of the basin is the most favorable period for the development of mudstone caprock. The basin facies, the shallow sea shelf facies and the semi-deep lacustrine-lacustrine lacustrine facies tend to develop high-quality regional cap rocks. The environment of the shore-shallow lacustrine facies, the platform facies, the platform margin facies, the delta facies and the rivers can only develop relative quality Poor local caprock; the lagoon and tidal facies can form high-quality regional cap rocks and local cap rocks with relatively poor quality. The mudstone caprock of the A sub-stage in the mid-diagenetic stage to the late diagenetic stage is the strongest.