新构造运动对藏北羌塘盆地油气保存条件的影响  

Influence of Cenozoic Tectonic Dynamics on Conditions of Hydrocarbon Preservation in Qiangtang Basin, Northern Tibetan Plateau Tibet

作　　者：南征兵[1,2] 李永铁[1] 郭祖军[3] 

机构地区：[1]中国科学院广州地球化学研究所 [2]中国石油勘探开发研究院,北京 [3]中国石油勘探开发研究院

出　　处：《海相油气地质》2008年第1期45-50,共6页Marine Origin Petroleum Geology

基　　金：国土资源部“十五”重点科技项目“青藏高原重点沉积盆地油气资源潜力分析”(200102081)资助

摘　　要：羌塘盆地是一个中—新生代海相残留盆地,泥盆系至侏罗系以海相沉积为主,白垩系至第四系则以陆相沉积为主。分布最广的上三叠统和侏罗系是主要勘探目的层。喜马拉雅运动以来,羌塘盆地的中生代变形格架受到改造。晚白垩世以来至少有过四次强烈活动,走滑、逆冲与伸展三种构造变形形式共存,以逆冲断层和扭压断层占主导,正断层或扭张断层较少分布。断层发育程度是东、西两头强,中间相对较弱,在E89°～E91°中间区块受新构造应力破坏较弱。青藏高原以整体升降为主,羌塘盆地更是相对稳定,其二级夷平面依然平整,位于海拔5200～5300m之间,说明高原在隆升时保持着整体的稳定性。认为羌塘盆地受新生代动力作用的影响不大,仍具有良好的油气勘探潜力。Qiangtang Basin is a Mesozoic-Neozoic marine residual one, in which marine sediments mainly deposited during Devonian-Jurassic period and continental sediments deposited during Cretaceous-Quaternary period.The widest distributing Upper Triassic and Jurassic rocks are the main targets of exploration. Since Himalayan orogeny, Mesozoic tectonic framework has been reshaped. At least four intensive tectonic activities has happened since Late Cretaceous so that tectonic deformations of strike slip, thrusting and extension coexisted. Thrust faults and wrench compression faults are common and normal faults or wrest tension faults are less. These faults is intensive in developing extent in the east and west ends of the basin and relatively weak in the middle part. Qiangtang Basin has kept relatively stable under the background of whole uplifting Qinghai-Tibet plateau. It is deemed that Qiangtang Basin has affected less by Cenozoic tectonic dynamics and possesses of good potential of oil and gas exploration.

关 键 词：新生代 构造运动 油气保存条件 羌塘盆地 青藏高原 

分 类 号：TE111.2[石油与天然气工程—油气勘探]