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利用辽东湾盆地辽中凹陷高精度层序地层研究的结果,构建了包含隐蔽砂体的精细沉积剖面,并使用法国石油研究院的Temis2D软件对隐蔽油气藏成藏进行了模拟,模拟的结果和实际钻探情况一致。模拟结果表明:辽东湾盆地辽中凹陷沙河街组透镜体隐蔽油气藏以初次运移为主,地层油气藏靠储集体以侧向二次运移为主,沙河街组隐蔽油气藏形成较早,大概于东营组沉积末期至馆陶组沉积初期最终成藏,但远离生烃中心的隐蔽油气藏由于运移距离较长其成藏定型时间有一定的延迟;东营组隐蔽油气藏以断层作为主要的输导通道以二次运移为主,也有借助于微裂缝或者靠超压突破盖层压力以初次运移为主,东营组隐蔽油气藏成藏较晚,于新近纪明化镇组沉积时期(12 Ma)开始成藏,而远离生烃中心的隐蔽油气藏甚至于6 Ma以后才开始成藏。隐蔽油气藏形成与输导体系、侧封和顶封密切相关,如果输导通道的输导性能过强而封堵性差,油气可能漏失。
Using the results of high-precision sequence stratigraphy of the Liaozhong sag in the Liaodong Bay basin, a fine sedimentary profile including a concealed sand body was constructed and the reservoirs of subtle reservoirs were simulated using the Temis2D software of the French Petroleum Research Institute. The results of the simulation and The actual drilling situation. The simulation results show that the subtle reservoirs of the lens body of the Shahejie Formation in the Liaodong Depression of the Liaodong Bay basin in the Liaodong Bay Basin are dominated by primary migration, while the reservoirs in the subtle reservoirs are mainly migrated laterally by secondary reservoirs, while the subtle reservoirs in the Shahejie Formation are formed earlier , Probably from the end of sedimentation in Dongying Formation to the final accumulation of Guantao formation in the early stage of sedimentation. However, subtle reservoirs far away from the hydrocarbon generation center have a certain delay due to the longer migration distance. The subtle reservoirs in Dongying Formation, The main channel of migration is dominated by secondary migration. There are also primary migrations by means of microcracks or overpressure breakthrough caprock pressure. Later, the subtle reservoirs of the Dongying Formation subsided in the late Minghua Formation Accumulation (12 Ma) began to accumulate, whereas subtle reservoirs far from the hydrocarbon generation began to accumulate even after 6 Ma. The formation of subtle reservoirs is closely related to the transport system, lateral seal and top seal. If the conductivity of the guide channel is too strong and the sealing ability is poor, the oil and gas may be lost.