孤北洼陷构造演化与勘探“黄金带”分布

Structural evolution and ‘golden zones’ of hydrocarbon exploration distribution in Gubei sub-sag

应用钻井、三维地震等资料,通过断裂活动性分析、洼陷构造演化过程恢复等方法,对济阳坳陷沾化凹陷孤北洼陷构造演化特征及其控制下的勘探"黄金带"分布进行研究。结果表明,受郯庐断裂走滑运动应力场影响,孤北洼陷东、西边界断层活动的差异控制了洼陷演化的阶段性和勘探"黄金带"的分布;东边界五号桩断层活动早、持续时间长,控制东次洼2期成藏,发育孔店组、沙四段和沙三段3个勘探"黄金带";西边界埕东断层活动晚、强度大,控制西次洼1期成藏,发育沙三段1个勘探"黄金带"。

By using the drilling data and 3 D seismic data,through the analysis of fracture activity and the restoration of tectonic evolution process,the structural evolution characteristics and‘golden zones’distribution of hydrocarbon accumulation of Gubei sub-sag of Zhanhua sag in Jiyang depression are studied.The results show that the‘golden zones’of hydrocarbon exploration distribution are controlled by boundary fault activity difference influenced by Tanlu fault deformation stress field.The Wuhaozhuang fault activity in the east is early and enduring long,controlling two stages of accumulation in the east sub-sag of Gubei sag,and three‘golden zones’of hydrocarbon exploration are developed which are Kongdian formation,the fourth member and the third member of Shahejie formation.Chengdong fault activity in the west is late and strong,controlling one stage of accumulation in the west sub-sag of Gubei sub-sag,and one‘golden zone’of hydrocarbon exploration of the third member of Shahejie formation is developed.