摘要
建立了乌什-温宿地区的地质结构模型,恢复了其新生代演化历史,探讨了油气远景。指出乌什-温宿地区由乌什凹陷和温宿凸起2个构造单元组成,乌什凹陷为具有挤压性质的断陷,温宿凸起为受基底卷入逆冲断裂控制的古隆起,构造样式侧向变化显著;该区新生代主要变形期为渐新世晚期-中新世早期和上新世-早更新世2期,水平挤压缩短量13～21km,缩短率14%～20%,平均变形速率0.56～0.9mm/a;受多旋回演化背景的控制,乌什-温宿地区形成多种有利的圈闭类型,具有早、晚两期成藏的特点。
The Wushi-Wensu area is an important transfer zone of the southern Tianshan foreland thrust belt, and has large oil and gas resources. Using outcrop, remote satellite pictures, seismic profiles and gravity data, we built a structural model of this area, restored it＇s evolutionary history, and further discussed it＇s gas and oil formation process. The results show that the structural style transforms laterally, and the area is comprised of two units. The northern part, Wushi sag, is a contractive fault depression, while the southern part, Wensu uplift, is a paleo-uplift controlled by basement-involved reverse faults. The main deformation occurred during late Oligocene to early Miocene and Pliocene to Quaternary, caused 13- 21 km horizontal shortening with 14%-20% shortening rate and averageshortening speeds of 0. 56-0.9 mm/a. There are abundant traps, which are controlled by the evolutionary history of the Northern margin of the Tarim basin. The traps in the Wensu uplift formed earlier, and the traps in the Wushi sag formed later. The difference in trap evolution controlled the reservoir formation.
出处
《天然气地球科学》
EI
CAS
CSCD
2005年第4期428-432,共5页
Natural Gas Geoscience
基金
"十五"国家重点科技攻关项目(编号:2004BA16A02-01-02-06)资助.
关键词
构造几何学与运动学
构造演化
油气成藏
南天山
Geometry and kinematics
Structural restoration
Oil and gas reservoil formation
South Tianshan.
作者简介
苗继军（1977-），男，陕西佳县人，博士研究生，主要从事构造地质与石油地质研究．E-mail：miaojijun@yahoo．com.on．
