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在岩心及薄片观察、粒度、物性等资料系统分析的基础上,定量研究了沧东凹陷孔二段中深层碎屑岩沉积、成岩作用对储集性能的影响,探讨了储集层致密化成因及致密化深度。研究表明,沉积作用是控制储集性能的内在因素,成岩作用是影响深层储集层的外在因素,较强胶结、强压实、粒度细是储集层致密的主要原因,泥质粉细砂岩及粉砂质泥岩等细粒沉积物的致密化起始深度在2 500 m左右。
On the basis of systematic analysis of core and thin slice observation, grain size, physical properties and other data, we quantitatively studied the influence of middle and deep clastic sediments and diagenesis on reservoir properties in the second member of Cangdong Depression, and discussed the causes of densification of reservoirs And densification depth. The study shows that sedimentation is an inherent factor controlling reservoir performance. Diagenesis is an external factor affecting deep reservoirs. Strong cementation, strong compaction and fine grain size are the main causes of reservoir densification. The initial densification depth of fine-grained sediments such as sandstone and silty mudstone is about 2 500 m.