塔中Ⅰ号构造带构造几何学与运动学  

Structural geometry and kinematics of Tazhong No.1 tectonic belt

作　　者：刘长磊 何登发[1] 张永 

机构地区：[1]中国地质大学(北京)能源学院,北京100083

出　　处：《地质科学》2018年第1期46-61,共16页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：中国地质调查局油气资源调查中心项目（编号：D216069）资助.

摘　　要：塔中Ⅰ号构造带是塔中地区重要的油气勘探区，已发现的油气田基本沿着塔中Ⅰ号构造带分布，塔中Ⅰ号构造带发育过程与塔中低凸起的形成演化密切相关。为了揭示塔中Ⅰ号构造带的活动期次、形成机制及塔中低凸起的形成演化过程，利用新的地震、测井、钻井资料，结合断层相关褶皱理论和平衡剖面复原技术，分析了塔中Ⅰ号构造带的几何学与运动学特征。研究结果表明：1）塔中Ⅰ号构造带为受控于塔中低凸起基底断层转折褶皱向前传递的过程中形成的背斜构造带；2）塔中地区识别出了上奥陶统、志留系两套生长地层，表明塔中Ⅰ号构造带主要活动时间为中晚奥陶世-志留纪；3）塔中低凸起东部构造活动强于中西部，东部累计缩短量为58．14km，累计缩短率为20．84％。综上，认为塔中低凸起的形成与演化是受控于早奥陶世末至晚奥陶世挤压构造背景下，基底发育断层转折褶皱，晚奥陶世以后，塔中低凸起进入构造拓宽期。早海西期，基底断裂活动基本停止，塔中低凸起基本定型。Tazhong No. 1 tectonic belt is an important oil and gas exploration zone in Tazhong area, the found oil and gas fields generally distribute along Tazhong No.1 tectonic belt, the development of Tazhong No. 1 tectonic belt was closely related to the formation and evolution of Tazhong lower uplift. In order to reveal the activity period, formation mechanism and the formation and evolution of Tazhong No. 1 tectonic belt, use the new earthquake, logging, drilling data, combining with fault related fold theory and balanced section recovery technology, analyzes the geometry and kinematics characteristics of Tazhong No. 1 tectonic belt. Research results show that： 1） Tazhong No. 1 tectonic belt is an anticlinal belt which was formed in the process of moving forward of the fault-bend fault in the base of Tazhong lower uplift; 2） Upper Ordovician and Siluric growth strata were identified in Tazhong lower uplift, indicating that the main activity time of Tazhong No. i tectonic belt was in the Middle- Late Ordovician and the Silurian. 3） The tectonic activity in the east is stronger than that in the middle and west in Tazhong lower uplift, and the cumulative shortening in the east is 58.14 km, with the cumulative shortening rate is 20.84%. In conclusion, it is believed that the formation and evolution of Tazhong lower uplift was controlled by the fault-bend fault in the base which developed under the background of compressive stress, and the compressive stress continued from the late Early Ordovician to the Late Ordovician. After the Late Ordovician, Tazhong lower uplift entered into the structural broadening period. In the Early Hercynian period, the fracture activity in the base basically stopped, and Tazhong lower uplift was basically shaped.

关 键 词：塔中低凸起 塔中Ⅰ号构造带 几何学与运动学 活动期次 成因机制 

分 类 号：P542[天文地球—构造地质学]