Differential Deformation and Control Mechanism of Fault Structures in Yubei Area of Tarim Basin(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2015年第03期
- Page:
- 42-54
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Differential Deformation and Control Mechanism of Fault Structures in Yubei Area of Tarim Basin
- Author(s):
- CHEN Gang; TANG Liang-jie; YU Teng-xiao; LONG Yu; YUE Yong; GUO Ying; ZHANG Xu-guang; XIE Xin-tong
- 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China; 2. Basin and Reservoir Research Center, China University of Petroleum, Beijing 102249, China; 3. Northwest Oilfield Company, SINOPEC, Urumqi 830011, Xinjiang, China
- Keywords:
- fault structure; structure deformation; stratification difference; stage difference; control mechanism; distribution pattern; Yubei area; Tarim Basin
- PACS:
- P542
- DOI:
- -
- Abstract:
- In order to reveal the differential deformation and control mechanism of fault, the 2D and 3D seismic profiles were detailed analyzed, and the variances of layering, staging and developing intensity of fault structure were carefully studied in Yubei area of Tarim Basin. The results show that in the vertical, the fault structure can be divided into 4 structure layers, including pre-salt basal structure mainly with thrust structure, post-salt Lower Paleozoic mainly with cover detachment, Upper Paleozoic and Cenozoic mainly with fault-related fold, and the structural deformation gradually becomes weaker from post-salt Lower Paleozoic to Cenozoic; in the plane, fault activity in the eastern of Yubei area is strong mainly with nappe thrust structure, and secondary faults develop much better and intensively, while thrusting in the central-western of Yubei area is weak mainly with thrust-decollement and high-angle thrust structures, and secondary faults develop poorly and dispersively; for the evolution time of fault, Middle Caledonian is the strongest period of fault activity in the eastern of Yubei area while weakest in the central-western, and Late Caledonian-Early Hercynian and Late Hercynian are the stable periods of fault activity in the eastern while relatively strong in the central-western, and Himalayan is the weakest period of fault activity as a whole, so that the fault activities migrate from the eastern to the western; development position, direction and distribution of fault structures are controlled by pre-existing basement structure, tectonic stress field setting and gypsum-salt detachment layer; faults develop intensively in the weak zone of pre-existing basement structure and are controlled by SE-trending extrusion stress, and faults passively thrust from NW to SE along the Lower-Middle Cambrian and form thrusting fault zone with the differential distribution of multiple NE-trending.
Last Update: 2015-05-27