松辽盆地西部扶杨油层成藏条件和勘探潜力

Reservoir-froming Conditions and Exploration Potential of Fuyang Oil Layer in the Western Songliao Basin

大庆长垣以西地区扶杨油层是后备储量接替的重要勘探目标之一。油层的成藏机理、成藏过程及油气分布规律 ,特别是 2 0 0 0m以下储层的勘探潜力的认识制约油气勘探 ,扶杨油层具有形成顶生下储式岩性油藏的成藏条件。青一段烃源岩在运移期油气垂向下排深度近百米 ,从齐家 古龙凹陷向两侧隆起油柱高度增大 (最大 2 75 0m) ,扶杨油层经历了多期大规模的侧向运移 ,依安组末期的构造运动是扶杨油层成藏的关键地质时期 ,古构造、断裂、储层物性是西部扶杨油层成藏的主要控制因素。指出了环齐家 古龙凹陷周边地区是扶杨油层勘探的有利区 ,并优选 7个目标 ,估算石油资源量3 6× 10 8t。

Fuyang oil layer in the western Songliao Basin is a important exploration region for reserve replacement.Factors controlling oil-gas exploration include the mechanism and process of reservoir-forming,the distribution of oil-gas ,especially the understanding to exploration potential of reservoir below 2 000 m.Its reservoir-forming pattern is lithologic reservoir of upper source rock and lower reservoir.The vertical depth of expulsion of hydrocarbon in source rock of K 1q 1 during migration period is near 100 m, and the oil column height is increasing (the maximum is 275 m) from Qijia-gulong to uplift on two sides.Its reservoir-forming depends on large-scale multistage lateral migration,and the tectonic movement in late E2-3y is the key period.The results of the study provide a new understanding of the main control factors to reservoir-forming of Fuyang oil layer, which include the palaeostructure,the fracture,and the reservoir physical property ,and point out favorable zones around Qijia-gulong depression,which include 7 exploration zones with estimated oil resource of about 3 65×10 4t.