柴达木盆地中、新生代构造演化及其对油气的控制

在综合分析区域构造背景、边界条件、基底性质、构造运动、不整合面、地层分布、沉积特征和构造演化史的基础上,认为柴达木盆地中、新生代的构造演化经历了两个伸展—挤压构造旋回,可划分为4个演化阶段,即早、中侏罗世伸展断陷—坳陷阶段、晚侏罗世—白垩纪挤压坳陷—挤压隆升阶段、古新世(路乐河期)—中新世早期(上油砂山期)整体挤压坳陷与柴西局部拉分弱断陷阶段和中新世晚期(狮子沟期)—第四纪挤压反转阶段。盆地的构造演化控制了烃源岩的分布与演化、圈闭的形成、油气运移与成藏以及油气的保存,进而控制了油气的分布,在此基础上指出了柴达木盆地的勘探方向。

Mesozoic-Cenozoic Structural Evolution in Qaidam Basin and Its Control Over Oil and Gas

Based on the comprehensive analysis of regional structure background, boundary conditions, basement properties, structural movement, unconformable surface, stratigraphic distribution, sedimentary characters, structural evolution history, it is considered that the Miozoic-Ceozoic structural evolution of Qaidam Basin has undergone two structural cycles of extension and compression, which can be divided into four evolution stages including the Early to Middle Jurassic extensional rift and depression stage, the Late Jurassic to Cretaceous compression depression and uplift stage, the Paleocene(Lulehe age) to Early Miocene(Shangyoushashan age) integer compression depression and the western Qaidam Basin regional pull-apart feeble rift stage, as well as Late Miocene(Shizigou age) to Quaternary compression inversion stage. The basin structural evolution controls the distribution and evolution of hydrocarbon resource rocks, the formation of traps, as well as the migration, accumulation and preservation of oil and gas, and further controls the distribution of oil and gas.