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在石油地质工作中,常以地层厚度的概念为基础编绘各种图件,以研究地层发育史和油气运移、聚集过程。但是如果仅应用现今的地层厚度而没有根据地层压实资料加以校正,则会造成某些偏差。这是因为在一定深度范围内,沉积层的厚度同埋藏深度之间为一变数关系。随着埋藏深度增加,上覆沉积层的重量使下层沉积层从原始松散和饱和水的状态不断压实,厚度变小,直至最终彻底成岩。这个深度对于泥岩为3200～3300米左右,而砂岩则小一些(当然,沉积物成岩过程是多因素造成的,但是压实作用仍可能是这一复杂
In the work of petroleum geology, various maps are often compiled on the basis of the concept of stratum thickness to study the development history of stratum and the process of hydrocarbon migration and accumulation. However, if only the current thickness of the formation is applied and not corrected according to the compaction information of the formation, some deviation will result. This is because, within a certain depth, the thickness of the sedimentary layer is a variable relationship with the depth of burial. As the depth of burial increases, the weight of the overlying sediments keeps the underlying sediments from being compacted from the original loose and saturated water, decreasing in thickness until eventually diagenetic. This depth is about 3200 to 3300 m for mudstone and less for sandstone (of course, the diagenesis of sediments is caused by many factors, but compaction may still be complicated