断裂对油气富集程度的控制作用

Control effect of faults to oil?鄄gas enrichment degree

付广 李建民

东北石油大学，黑龙江 大庆 163318 中国石油大庆油田有限公司呼伦贝尔分公司，内蒙古 海拉尔 021000

Northeast Petroleum University, Daqing 163318, China Hulunbeier Oilfield Company, Daqing Oilfield Co. Ltd.,
Hailaer 021000, China

为了认识含油气盆地断裂发育区油气分布规律及断裂对油气富集程度的控制作用，研究了断裂组合、断￣砂配置、断裂封闭性及其后期活动与油气富集之间的空间关系。结果表明，断裂对油气富集控制作用明显。其主要表现在4个方面：1）断裂空间上，地垒和断阶型组合形成的断层圈闭油气富集；平面上，2条或多条断裂组合形成的断层圈闭油气富集。2）当油气沿着砂体侧向运移时，反向断裂下盘断￣砂配置油气富集；当油气沿断裂垂向运移时，油源断裂上盘断￣砂配置油气富集。3）断裂侧向封闭性越强，油气富集程度越高。4）断裂后期活动强度越小，油气富集程度越高。

To study the oil-gas distribution law in faults growing zone of petroleum basin and through studing the special relation between faults combination, fault-sandbody matching, fault sealing and late period activity with oil-gas enrichment, this paper made a research on the control effect of faults to oil-gas enrichment degree. The results indicate that the control effect of faults to oil-gas enrichment degree is obvious,mainly showing that the oil and gas accumulate in fault trap which is formed by combination of horst and fault-step in space, and accumulate in fault trap which is formed by combination of two or more faults in plane; when oil and gas migrate laterally along sandbodies, oil and gas accumulate in fault-sandbody matching place and the lower wall of reverse fault; when oil and gas migrate vertically along faults, oil and gas accumulate in fault-sandbody matching place and the upper wall of fault connecting source rock and reservoir; the stronger the lateral sealing of fault is, the higher the oil-gas enrichment degree is; the weaker the fault activity in late period is, the higher the oil-gas enrichment degree is.

10.6056/dkyqt201406006