柴达木盆地北缘马北地区古今构造与油气藏的耦合

Coupling Between Inchoate-nowadays Geological Structures and Hydrocarbon Reservoirs in Mabei Area,Northern Margin of Qaidam Basin

利用最新三维地震解释成果,结合钻井和区域地质资料,运用断裂生长指数、平衡地质剖面、趋势厚度恢复等多种方法对马北地区断裂组合、断裂发育期次、断裂演化、构造高点发育及迁移规律进行了精细解剖。依据断层组合关系、安德森断层模式及Harding1974年关于走滑断裂系应力、应变的相关论述,对该地区新生代以来各地质历史时期的应力状态进行了探讨,并以油气动态成藏的方式系统地研究了断裂-构造高点演化与油气藏之间的耦合关系,认为马北地区多期断裂是以马仙断裂为主导的走滑断裂体系,其断裂演化与马仙断裂活动息息相关,且与古今构造之间具有明显的耦合关系,两者共同控制了新生代油气藏的形成、改造及分布。

Based on the new interpretation on seismic data,integrated with drilling and regional geology,the paper dissected the fault assemblage,fault forming phases,fault evolution and the rule of structural high devel-opment by means of fault growth index,balanced section,and trend thickness method.According to fault as-semblage,Anderson fault mode and Harding's statements on stress and strain of strike-slip fault,stress condition since Cenozoic in Mabei area was discussed.Meanwhile,by adopting the dynamic approach,the coupling be-tween inchoate-nowadays geological structures and hydrocarbon reservoirs is studied.Multi-stage faults in Mabei area is the strike-slip fault system dominated by Maxian fault.The fault evolution in the study area is closely linked with Maxian fault.There was significant coupling relationship between the fracture and inchoate-nowa-days geological structures,and it is the fault and the inchoate-nowadays geological structures that jointly con-trolled the formation,reconstruction and distribution of Cenozoic hydrocarbon reservoirs.