不同动力学机制共同制约下的储层压实效应特征——以塔里木盆地库车坳陷白垩系储层研究为例

在垂向压实和侧向压实的双重动力学机制叠加下, 库车坳陷白垩系碎屑岩储层展现出的压实效应, 无法用传统单一的垂向压实理论来解释.通过详实的成岩特征显微统计分析, 梳理出了垂向(埋深)压实和侧向(构造)压实分别对于研究层段的压实效应.研究层段的压实效应主要由垂向压实造成, 侧向压实造成的压实效应相对较弱; 侧向压实减孔量占总压实减孔量的比例并不与构造应力本身的大小呈明显的正比关系, 侧向构造应力施压的时间与储层垂向埋藏压实程度之间的时间配置关系、构造挤压应力的大小等因素严重制约着构造应力对于储层的侧向压实效应.

The characteristic of diagenetic compaction induced by multiform geodynamic mechanisms in reservoir: An example from Cretaceous sandstone reservoir in Kuqa depression,Tarim Basin

Under superposition of vertical burial compaction and lateral compression compaction in Cretaceous sandstone reservoirs in Kuqa depression, Tarim Basin, the overall compaction effect in the reservoirs cannot be explained by classical vertical compaction theory. Through microscopically analysis of rock constituents and diagenetic characteristics in the reservoirs, the compaction effects controlled by vertical compaction and lateral compaction are analyzed and contrasted. The result shows that the overall compaction effect in the reservoirs is caused by vertical compaction mostly, and that caused by lateral compaction is less correspondingly. The proportion for pore loss caused by lateral compaction to pore loss made by total compaction is not positively correlated to intensity of compression stress. There are several important factors controlling the effect of lateral compaction in the reservoir. In addition to the intensity of compression stress, the relationship between time of lateral compression occurrence and vertical bury depth of the reservoir is a major concern as well.