渤海湾盆地济阳坳陷异常高压特征分析

OVERPRESSURE CHARACTERISTICS IN THE JIYANG DEPRESSION,THE BOHAIWAN BASIN

压力的形成和演化受控于地质条件,渤海湾盆地济阳坳陷东营凹陷与沾化凹陷在凹陷形成演化与异常高压纵向分布特征、主体分布层位和形成机制等4个方面具有相似性,其压力形成和演化也应具有相似特征。渤南洼陷是济阳坳陷沾化凹陷中的一个典型异常高压洼陷,压力场演化定量研究分析表明,渤南洼陷超压形成时代较晚,异常高压主体层段(沙四上段和沙三段)的超压在东营期末开始形成。综合分析认为整个济阳坳陷异常高压具有晚期形成的特征。

Pressure evolution is controlled by geologic conditions. The Dongying and Zhanhua Sags of the Jiyang Depression in the Bohaiwan Basin are similar in tectonic characteristics and evolution, over-pressure vertical distribution, main distribution strata and origin mechanism, so their pressure evolutions also have some similarities. The Bonan sub-Sag is a typical overpressure sub-sag in the Zhanhua Sag of the Jiyang Depression. Based on quantitative analysis of pressure field evolution, it is discovered that overpressure in the Bonan sub-Sag developed late. The main strata of overpressure （the third member and the upper part of the fourth member of Shahejie Formation） developed after the Dongying episode. Overpressure in the whole Jiyang Depression developed late.