关于碎屑岩层的去压实校正方法的讨论——兼讨论李绍虎等提出的压实校正法

碎屑岩层的去压实校正的主要问题是建立一个能正确反映岩层压实规律的孔隙度深度函数或密度深度函数。通常用单井或多井中实测的不同岩层在不同深度的孔隙度资料并不能真正代表某一特定岩层的压实曲线。利用单井或多井中观测到的同一岩层的孔隙度深度数据来建立该岩层的孔隙度深度函数,或许可以得到更加理想的去压实校正结果。由于岩层骨架密度与深度无关,同一岩层的孔隙度深度函数与密度深度函数呈线性互补相关,因此也可以利用少数几组可靠的观测数据解析出Athy孔隙度深度函数中的初始孔隙度值和压实系数。

A DISCUSSIOM ABOUT THE METHOD OF DECOMPACTION CORRECTION

The main problem of decompaction correction is how to found a reliable porosity depth function or density-depth function which expresses the compaction process of clastic rock. Because the present day relationship between porosity and depth usually is measured from different layers in one well or poly wells, it couldn't reflect the compaction path of a given layer during burying history. A function found on the data of porosity depth or density-depth from a given layer in one well or poly wells could be more reliable so that it can figure out a satisfying decompaction thickness. Because the grain density of rock keep a constant in any depth, the relationship between porosity depth function and density-depth function should be a linear complement and the initial value and compaction coefficient in the Athy's porosity depth function also could be resolved from two or more sets of porosity depth and density-depth data measured in the same layer.