准噶尔盆地中部车-莫古隆起控藏作用分析

The role of Che-Mo palaeohigh in controlling hydrocarbon accumulation in central Juggar basin

车-莫古隆起是中晚侏罗世准噶尔盆地处于小型陆内前陆坳陷演化阶段形成的一个前缘隆起,其形成和演化经历了隆起形成发育(J2x—J3)、隆起埋藏(K—E)和隆起消失(Nt—Q)3个主要阶段。不同构造期次形成的隆起与生烃凹陷的时空配置关系在宏观上控制了油气藏的形成与分布格局,车-莫古隆起对准噶尔盆地中部中生界油气成藏具有重要的控制作用,主要表现为:①早期(J2x末—J3)成藏,并部分遭受破坏;②中期(K1末—E末)为主要成藏期;③晚期(Nt晚期—Q)油气藏调整。车-莫古隆起区有利勘探区带首选南翼永进地区,其次是车莫古隆起北翼沙窝地、庄东北地区。

Che-Mo palaeohigh is a marginal uplift formed when Juggar basin was still a small intracontinental foreland depression in evolution during the Middle-Late Jurassic. Its formation and evolution can be divided into three main stages ： growth （ JEX-J3 ）, burial （ K-E ）, and disappearance （Nt-Q）. The spatio-temporal configuration of the uplifts and hydrocarbon kitchens formed in different structural stages controlled the formation and distribution of hydrocarbon accumulations. And among the uplifts, Che-Mo palaeohigh played an important role in dominating the Mesozoic hydrocarbon accumulations in central Juggar basin in that the reservoirs came into being during the late JEX -J3, entered critical reservoiring period during the late K and the late E, and started adjustment during the late Nt-Q. It is concluded that the most prospective exploration target in Che-Mo palaeohigh shall be the Yongjin area in the south side of the uplift, while Sawodi and Zhuangdongbei in north part are regarded as the second best targets.