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松辽盆地白垩系地层中的厚层泥岩,具有明显的欠压实特征和异常的孔隙流体压力。它们在油气生成之前已经形成。欠压实泥岩的压力封闭作用,对于油气的保存具有重要意义;也是浅层油气富集的必要条件。欠压实泥岩的异常高压带,不仅为油气运移提供了动力,而且对油气的垂向运移造成了一个极好的屏障,也是划分含油层系的天然界线。盆地内欠压实泥岩的分布,不仅控制着油气运移的方向,而且也决定了油气以短距离侧向运移的特征。与欠压实泥岩层(区)相邻的混合压实相地区和层位,是油气富集的最有利地带。
The thick mudstone in the Cretaceous strata in the Songliao Basin has obvious under-compaction characteristics and abnormal pore fluid pressure. They were formed before oil and gas generation. The pressure-sealing effect of under-compacted mudstone is of great significance for the preservation of oil and gas, and is also a necessary condition for the enrichment of shallow oil and gas. The abnormally high pressure zone of undercompacted mudstone not only provides impetus for the migration of oil and gas, but also provides an excellent barrier to the vertical migration of oil and gas as well as the natural boundary dividing the oil-bearing formation. The distribution of under-compacted mudstone in the basin not only controls the direction of hydrocarbon migration, but also determines the characteristics of hydrocarbon migration laterally with a short distance. The mixed compaction facies and horizon adjacent to undercompacted shale (area) are the most favorable areas for hydrocarbon enrichment.