塔里木盆地北部油气系统与构造运动的关系

Relationship of Petroleum and Tectonic in North Tarim Basin

库尔勒鼻凸—草湖凹陷位于塔里木盆地满加尔坳陷北延部分,主力烃源岩为腐泥型的下古生界寒武系、奥陶系暗色灰岩,储集岩为古生界奥陶系灰岩和石炭系、三叠系、侏罗系、白垩系砂岩.根据原油性质及流体包裹体分析,寒武系主生油期为加里东中期—海西晚期,奥陶系为海西期—燕山期.油气主运移期分别为晚古生代晚期—早侏罗世,早中新世—第四系.早海西期和晚海西期的构造运动对研究区油气的聚集具有极大的影响.因此,结合构造运动期次,划分出深部海西早期油气系统(∈-D1+2)、晚燕山期油气系统(D3-J)和上部喜马拉雅期油气系统(K-Q).

Kuerle nose salient-Caohu sag is located in the northern continuation of Manjiar Depression, North Tarim Basin. The main source rock is the Cambrian-Ordovician dark carbonate rock. The major reservoir rocks are Paleozoic Ordovician carbonate rocks and Carboniferous, Triassic, Jurassic, Cretaceous sandstones. Based on the analysis of the chemical character of liquid inclusion in reservoir rock, the major period of oil generation for Cambrian source rocks was proposed to be in Middle CaledonianLate Hercynian period; while that of Ordovician source rocks was in Hercynian-Yashanian period. The oil and gas were proposed to migrate respectively in Late Paleozoic-Early Jurassic and Early MioceneQuaternary . The oil and gas accumulation in this region was affected by Early and Late Hercynian pe- riod tectonic activities. The petroleum systems are divided into Early Hercynian period system （∈-D1＋2）, Lately Yenshan period system（D3-J）and Ximalaya period system（K-Q） based on the periods of tectonic activities.