海拉尔盆地乌尔逊—贝尔凹陷断层控藏作用

通过对已发现油气藏系统研究和统计，发现乌尔逊—贝尔凹陷的油气藏几乎都与断层发育相关，据此将油气藏划分为断层相关背斜型(FA)、断层相关地层型（FS）、断层相关岩性型（FL）和断块型（FB）等4大类。对油气成藏控制因素进行研究后认为,断层控藏作用明显：（1） 圈闭高点到断层的距离控制油气分布，90％以上的工业油气流井所在圈闭的高点到断层的距离小于1km；（2） 断层断距大小控制油气聚集规模，当断距为200～400m时与断层相关的圈闭油气富集程度最高；（3） 与NNE、NEE方向断层有关的圈闭容易聚集油气；（4） 当与圈闭相关的断层断距小于盖层泥岩视厚度而大于储层砂岩视厚度时，圈闭容易聚集油气。

STUDY ON FAULT CONTROLLING HYDROCARBON ACCUMULATION IN WUERXUN-BEIER SAG,HAILAER BASIN

Based on the systematical research and statistical analysis of the reservoirs founded in Wuerxun-Beier,it is found that almost all the reservoirs are related with faults,based on which,the reservoirs are divided into four kinds：fault-related anticline reservoir(FA),fault-related stratigraphic reservoir(FS),fault-related lithology reservoir(FL) and fault block reservoir(FB).After the study on reservoirs distribution,it is indicated that faults control the hydrocarbon accumulation:1.The distance from the fault to trap controls the hydrocarbon distribution,and more than 90% of the industry production wells are located within 1km from faults.2.The size of the fault throw controls the hydrocarbon accumulation,and the trap developing with a fault which has a fault throw between 200～300m contains the most hydrocarbon accumulation.3.The trap with NNE or NEE direction faults has more chance to accumulate hydrocarbon.4,When the vertical throw of trap-related fault is larger than the apparent thickness of reservoir and smaller than the apparent thickness of the seal,the trap is easier to accumulate hydrocarbon.