Oil Gas Migration Law Research Of The Western Slope Zone In The North Of Songliao Basin

This article through geological, geochemical, earthquake and the former research resultsand other information on the western slope of the northern Songliao Basin, gas generation,migration of oil and gas transporting system, numerical simulation, migration path of oil andgas geochemical tracer, oil and gas distribution, oil and gas migration control factors weresystematically studied, and put forward the western slope zone of oil and gas migration andaccumulation models are concluded from the simple slope migration and accumulation model,for the next step work laid the foundation.Western slope zone of oil and gas sources in Qijia Gulong sag, the time of Mingshuiformation is the western slope of migration period. Western slope zone of fracture, sand body,unconformity surface constitute the oil and gas migration system, fault of western slope zoneis development, it is not oil gas long distance migration of the main path; the western slopezone Gaotaizi reservoir sand body development degree is high, but the single sandbodythickness is thinner, lateral transporting ability strong, easy to form sand body verticallystacked or fault of communication, S23reservoir sandbody thickness less than of Gaotaizi oillayer, but the single sand body is large thickness, lateral migration is ability, S01reservoir sandbody is development, the general is not continuous lenticular single sand body, oil and gas inwhich is difficult to lateral migration, it can not accumulation without the fault relying;research area in Gaotaizi oil layer of top surface development a set of unconformity,unconformity bottom conglomerate agenesis, but due to the unconformity surface ofsandstone" skylight" existence, Gaotaizi oil gas can pass" skylight" by communication to S23reservoir. According to the oil and gas migration to the results of the numerical simulation onGaotaizi oil layer of the existence of two oil and gas migration path, there are three oil andgas migration pathways of S23reservoir, and through the migration of oil and gas geochemicalparameter tracer also gets similar results with numerical simulation.Based on the dominant migration path analysis we reached the western slope zone of oiland gas migration pathways of the main control factors, and summed up the western slopezone of oil and gas migration and accumulation patterns.