济阳坳陷断层活动差异性与油气富集关系

Relationship between Fault Activity Difference and Hydrocarbon Enrichment in Jiyang Depression

通过对济阳坳陷断层发育特征、活动性及其演化规律进行分析,结合不同凹陷油气富集规律,研究了断层活动差异性及其对油气富集的影响。结果表明:研究区断层活动性在沙二期前表现为"南强北弱"的特点,沙二期后则为"北强南弱";将断层分为控烃、控运和控藏3类。控烃断层数量越多、古近纪活动强度越大,油气富集程度越高;控运断层数量越多、新近纪活动强度越大,浅层油气所占比例越大;控藏断层活动性及形态等决定构造带发育,控制圈闭聚油能力。

By analysis of development features,activity and evolution regularity of faults in the Jiyang Depression,and combining the hydrocarbon enrichment regularity of various sags,the fault activity difference and its effect on hydrocarbon enrichment was studied. The results indicate that the fault activity presented the feature of 'strong in the south and weak in the north'before Shahejie2 period,but'strong in the north and weak in the south'after Shahejie 2 period. The faults are classified into:( 1) hydrocarbon-controlling faults,( 2) migration-controlling faults,and( 3) accumulation-controlling faults. The more the hydrocarbon-controlling faults were,the stronger the fault activity intensity during Paleogene was,the higher the hydrocarbon enrichment degree is.The more the migration-controlling faults were,the stronger the fault activity intensity during Neogene was,the bigger the hydrocarbon ratio in shallow layers is. The activity and form of the accumulation-controlling determined the development of the structural belts and controlled hydrocarbon accumulating capacity of traps.