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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1km;(2)断层断距大小控制油气聚集规模,当断距为200～400m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。
Based on the researches and statistics of the discovered oil and gas reservoirs, it is found that almost all the oil and gas reservoirs in the Wuerxun-Beier sag are related to the fault development. Therefore, the oil and gas reservoirs are divided into fault-related anticline (FA), fault-related stratigraphic ), Fault-related lithology (FL) and fault block (FB) and other four categories. After studying the control factors of hydrocarbon accumulation, it is considered that the function of fault controlling and reservoiring is obvious: (1) the distance between the trapping high point and the fault controls the oil and gas distribution, and the distance from the high point where the industrial oil & gas well where more than 90% Less than 1km; (2) the magnitude of fault offset controls the scale of oil and gas accumulation, and the fault-related trap oil and gas accumulation is the highest when the fault distance is 200-400 m; (3) the traps associated with the NNE and NEE fault faults tend to accumulate Oil and gas; (4) traps tend to accumulate oil and gas when trap-related faults are less than fault thickness of cap rock and greater than reservoir thickness of sandstone.