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九龙山构造须家河组物性较差,具低孔、低渗特征,为Ⅲ类储层。从目前工区实际钻井、测井和地质资料表明,其地层异常高压分布非常复杂广泛。本文在部分实测压力数据基础上,开展了利用正常压实曲线的等效深度法计算地层孔隙压力、基于Eaton法计算地层孔隙压力和基于层速度—有效应力的关系预测地层孔隙压力的计算研究,建立了计算公式模型,由此识别单井的异常高压层位。对异常高压地质层位的划分具有指导意义。
The structure of Jiulongshan Xujiahe Formation is poor, with low porosity and low permeability, which is Class Ⅲ reservoir. The actual drilling, logging and geological data from the current work area show that the distribution of abnormal high pressure in the strata is very complicated and extensive. Based on some measured pressure data, the calculation of formation pore pressure using the equivalent depth method of normal compaction curve, the calculation of formation pore pressure based on Eaton’s method and the calculation of pore pressure based on the relationship between layer velocity and effective stress are carried out. The model of calculation formula was established, and the abnormal high pressure horizon of single well was identified. It is instructive for the division of abnormal high pressure geologic horizon.