吐哈盆地油运移输导通道及对油成藏的控制——以七泉湖构造带水西沟群为例

Migration Pathways and Its Control on Oil Accumulation in Turpan-hami Basin:a Case Study of Shuixigouqun Oil Layer in Shanle Qiquanhu

通过油藏解剖和其成藏条件的空间配置关系,在总结七泉湖构造带水西沟群油层油运聚成藏机制及模式的基础上,对其运移输导通道及其对油成藏与分布的控制作用进行研究,得到七泉湖构造带水西沟群油层的油运移输导通道主要包括①燕山期断裂是胜北洼陷煤系烃源岩生成的油向上覆西山窑组和三间房组地层垂向运移的输导通道;②砂体配合断裂是胜北凹陷水西沟群中的油向七泉湖构造带水西沟群中侧向运移的输导通道。七泉湖构造带水西沟群油层的油运移输导通道对油成藏与分布的控制作用主要表现为①燕山期断裂的发育程度控制着胜北洼陷水西沟群煤系烃源岩生成的油向七泉湖构造带水西沟群中油的供给量;②七泉湖构造带水西沟群砂体的展布特征控制着油的聚集区域,被水西沟群砂体配合断裂形成的输导通道连接的高断块圈闭的构造高部位是油聚集的主要区域。综上所述研究可以得到断裂配合砂体连接的断块型圈闭附近应为七泉湖构造带油勘探的有利目标。

Through oil reservoir anatomization and analyzing its spatial-temporal relationgship with reservoir forming condition, migration and the control on oil accumulation and distribution were studied on the basis of the summarizing oil migration mechanism and mode in Shuixigouqun oil layer, Qiquanhu structural belt. It was considered that oil migration pathways of Shuixigouqun oil layer of Qiquanhu structural belt were as follows in main ： One is that the Yanshan stage faults are transporting pathways through which oil that generated by Shengbei depression coal source rock of Shuixigouqun migrated upward into Xishanyao zu and Sanjianfang zu oil layers. The second is that the sand bodies combining with faults are transporting pathways of oil in Shuixigouqun oil layers in Shengbei depression migrating laterally to Shuixigouqun oil layer in Qiquanhu structural belt. The controlling roles of oil migration pathways of Shuixi-gouqun oil layer in Qiquanhu structural belt to oil accumulation and distribution are mainly manifested as： One is that the development degree of Yanshan stage faults controls oil supply amount of Shuixigouqun oil layer in Qiquanhu structural belt. The second is that the exhibition characteristic of Shuixigouqun oil layers sand bodies in Qiquanhu structural belt are main oil accumulation areas, and high structural position of high fault block connected by transporting pathways that formed by sand bodies combing with faults are mian oil ac-cu- mulation areas. Form the above comprehensive study, the reservoir with in the high fault block should be the favorable objects oil exploration.