塔里木盆地玉北地区成藏主控因素与油气富集规律

Study of the Main Factors Controlling Hydrocarbon Accumulation and the Regularity of Hydrocarbon Enrichment in Yubei Area of Tarim Basin

据地震剖面构造解析,玉北1构造带具东西分段、南北分块特征。通过对玉北1油藏多口井原油地化、生产动态分析,认为玉北1油藏为岩溶缝洞型油藏,受碳酸盐岩缝洞型储层非均质控制,属局限缝洞体,没有统一的油水界面。油藏受NW向调节断裂分割,海西晚期再次活动的高部位断片成为玉北1油藏油气富集区。玉北地区成藏模式为"寒武系供烃,断裂与不整合疏导,两期岩溶储层,海西晚期成藏,后期调整",油气富集受储层与断裂控制。海西晚期活动后的稳定构造带是有利的油气聚集区带,中部多期岩溶发育,盖层良好地区是较有利地区。

According to the structural analysis of seismic profile,Yubei 1 tectonic belt has the East-West segmentation and South-North block feature.Through the localization and dynamic production analysis about the Yubei 1 oilfield,Yu- bei I reservoir is Karst-Vuggy reservoir, controlled by heterogeneity of Karst-Vuggy carbonate reservoir rocks.It belongs to the isolated Karst seam and has no uniform oil-water boundary.The reservoir is divided by NW-trending regulating fanlts.The region of hydrocarbon enrichment in Yubei 1 reservoir is the high position of fragment with inheritance activities in late Hercynian;＂The Cambrian strata supplied hydrocarbon;Oil and gas were migrated by faults and unconformity; Two karst reservoir were developed;Hydrocarbon accumulation was in late Hercynian;Oil and gas were adjusted in Himalayan＂ is the hydrocarbon accumulation model in Yubei area.Hydrocarbon enrichment was controlled by reservoir and faults in Yubei area.Tectonic zones which moved in late Hercynian and are stabilization in nowadays are Oil and gas advantaged accumulation zone.Multi period karst area of midland are a favorable zone in Yubei area.