1. 中国石油勘探开发研究院实验研究中心, 北京, 100083; 2. 中国地质大学能源学院, 北京, 100083; 3. 浙江大学地球科学系, 杭州, 310027; 4. Department of Geosciences, Princeton University, Princeton, NJ08544, USA
GEOMETRICAL METHODS OF COMPLICATED STRUCTURAL ANALYSIS AND THEIR APPLICATION
Guan Shuwei1, Li Benliang1, He Dengfa2, Wang Xin3, John Suppe4
1. Research Institute of Petroleum and Development of China, Beijing 100083; 2. School of Energy Resource, China University of Geosciences, Beijing 100083; 3. Department of Geosciences, Zhejiang University, Hangzhou 310027; 4. Department of Geoscicences, Princeton University, Princeton, NJ 08544, USA
eismic data in the complicated geological area can’t intuitionally reflect the actual geometries of surface and subsurface structures,hence,identification of dip domains and axial surfaces analysis,together with seismic reflection profiles and surface structural measurements,have been used to define the quantitative geometrical relationship between shape of fold and fault,which is an effective method to structural interpretation of poor seismic images.Geometrical and kinematical analyses based on structural interpretation will contribute to understand deformation process,time and dynamic mechanism,and quantitatively simulate the kinematic process of imbricate thrusting and their related folds of multi-order and multi-phase.We presented four examples,in which the above methods were effectively applied,from the southern margin of the Junggar Basin and the periphery of Tarim Basin.The steps of fine interpretation using dip domains and axial surfaces analysis were detailedly expounded in the first example.The quantitative relationship among the displacement and shape of fault and fold on the kinematic process of Wuboer thrust belts in the northern margin of Pamir were discussed from perspective of geometry and kinematics in the second example.The break-forward thrusting was recognized by the gradually younger of the base of growth strata on the forelimb of the three anticlines in the Fusha thrust belt in the front of the West Kunlun Mountains in the third example,and kinematic model of the distortion in the middle part of the Qiultag anticline were constructed using structural trend analysis in the last example.