敖古拉断裂输导油气有利部位及其对萨葡高油层油气聚集规律的影响

Favorable Hydrocarbon Transport Sites of Aogula Fault and Their Influence on Hydrocarbon Accumulation Pattern of Saertu,Putaohua and Gaotaizi Reservoirs

针对敖古拉断裂附近萨葡高油层油气分布规律不明确的问题,在敖古拉断裂发育特征与油气分布关系研究的基础上,利用断裂伴生裂缝和凸面脊输导油气有利部位刻画方法,结合敖古拉断裂附近萨葡高油层油气分布,对敖古拉断裂不同时期输导油气有利部位及其与油气聚集进行研究。研究结果表明:敖古拉断裂在萨葡高油层内除了东、西两端和中部2处局部部位外,其余部位皆发育伴生裂缝输导油气有利部位;敖古拉断裂在萨葡高油层内发育7处凸面脊输导油气有利部位,其中部和中西部各发育3处凸面脊输导油气有利部位,东部仅发育1处凸面脊输导油气有利部位;敖古拉断裂不同时期输导油气有利部位与萨葡高油层油气聚集关系主要表现为伴生裂缝和凸面脊共同输导使萨尔图油层油气最为富集;伴生裂缝输导对油气成藏贡献大于凸面脊输导。该研究揭示了敖古拉断裂附近萨葡高油层油气分布规律,对萨葡高油层的下步油气勘探具有指导意义。

To address the problem of unclear hydrocarbon distribution pattern in Saertu,Putaohua and Gaotaizi reservoirs near Aogula Fault,the favorable hydrocarbon transport site of Aogula Fault and its influence on hydrocarbon accumulation in different periods were studied with the description of the favorable sites for hydrocarbon transport by associate fractures and by convex ridges,based on the study of the relationship between the development of Aogula Fault and the hydrocarbon distribution,and the hydrocarbon distribution of Saertu,Putaohua and Gaotaizi reservoirs near Aogula Fault.The results of the study showed that Aogula Fault was developed with favorable sites for hydrocarbon transport by associated fractures in Saertu,Putaohua and Gaotaizi reservoirs,except for east and west ends and the central part;Aogula Fault had seven favorable sites for hydrocarbon transport by convex ridges in Saertu,Putaohua and Gaotaizi reservoirs,including three sites in its central and central-western parts,and only one site in the east;the relationship between the favorable hydrocarbon transport site of Aogula Fault and hydrocarbon accumulation in Saertu,Putaohua and Gaotaizi reservoirs during different periods was mainly manifested by the hydrocarbon transport jointly by associated fractures and convex ridges,resulting in the greatest hydrocarbon accumulation in Saertu reservoir;the contribution of transport by associated fracture to hydrocarbon accumulation was greater than that of transport by convex ridges.The study correctly revealed the hydrocarbon distribution pattern in the Saertu,Putaohua and Gaotaizi reservoirs near Aogula Fault,with a guiding significance for the further hydrocarbon exploration of Saertu,Putaohua and Gaotaizi reservoirs.