敖古拉断裂带在大庆长垣以西地区油气运聚成藏中的作用

Role of Aogula fault zone in oil and gas migration and accumulation in Daqing Placanticline and its west

在敖古拉断裂带发育及活动特征研究的基础上,根据断裂带特征及断移地层岩性特征,预测断裂带中泥质含量,据此对敖古拉断裂带在主要目的层青山口组、姚家组和嫩一、二段内的侧向封闭性进行了评价。研究表明该断裂带在青山口组、姚家组和嫩一、二段内对油气均具有良好的侧向封闭性。通过对敖古拉断裂带与齐家—古龙凹陷源岩及油气藏分布关系的研究认为,敖古拉断裂在大庆长垣以西地区油气运聚成藏过程中对齐家—古龙凹陷西运油气的遮挡作用,使油气在断裂带东侧聚集成藏;对齐家—古龙凹陷西运油气的转向和汇聚作用,使断裂带以西的油气呈线状分布。

Based on the study of the development and movement characteristics of Aogula fault zone,shale content is forecasted according to the characteristics of the fault zone and its lithology.The lateral sealing behavior of Aogula fault zone is evaluated for the main target formations such as q,y,n_1 and n_2. The result indicates that Aogula fault zone had served as a good lateral seal to oil and gas in q,y,n_1 and n_2.The study of the relationship of Aogula fault zone and source rock in Qijia—Gulong sag and the distribution of reservoirs shows that Aogula fault zone hindered oil and gas migration to the west of Qijia—Gulong sag in Daqing Placanticline and its west,thus formed oil and gas accumulation in the east of the fault zone;the diversion of oil and gas migration to the west of Qijia—Gulong sag made oil and gas distribute in strings to the west of Aogula fault.