西湖凹陷平湖斜坡带花港组异常压力预测  

Abnormal Pressure Prediction of Huagang Formation in Pinghu Slope,Xihu Sag

作　　者：周海廷[1] 姜效典[1] 李德勇[1] 邢军辉[1] 

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2017年第3期80-86,共7页Periodical of Ocean University of China

基　　金：中国地质调查局项目(GZH200900504-217-3);国家科技攻关项目(2016ZX05027-002-005)资助~~

摘　　要：针对西湖凹陷中深层普遍存在异常压力的现象,以实测地层压力为约束,结合钻井异常压力预测,在测井约束的波阻抗反演方法反演花港组的层速度的基础上,利用Fillippone公式计算地层压力系数,最终实现平湖斜坡带花港组异常压力的预测。预测结果显示:平湖斜坡带花港组地层泥岩段普遍存在异常高压,且异常高压明显呈带状分布,在垂向上可划分为4个异常高压带。随着花港组地层埋深的增加,异常高压带的压力系数由西向东、由南向北具有逐渐增大的特征,即平湖斜坡带花港组地层异常压力的分布受到泥岩发育和地层埋深的共同影响。Abnormal pressure is generally developed in the middle-deep formation in Xihu sag,based on the interval velocity calculation with the method of well-constrained impedance inversion,the formation pressure coefficient is calculated by using Fillippone equation,combined the measured formation pressure data with drilling well abnormal pressure prediction approach,then the distribution of the abnormal pressure of Huagang formation can be analyzed.The result shows that：the overpressures are commonly developed in shale formation of Huagang in Pinghu slope,and distribute as belt obviously,which can be divided into four overpressure belts in the vertical direction.The pressure coefficient of the overpressure belts is increasing form west to east and form south to north gradually,as the depth of Huagang formation deepens.The above distribution characteristics of the overpressure belts prove that the abnormal pressures of Huagang formation in Pinghu slope is controlled by the shale development and formation depth.

关 键 词：平湖斜坡带 花港组 层速度反演 异常压力预测 

分 类 号：P642[天文地球—工程地质学]