Zoning-grading Analysis and 3D Panoramic Characterization of Thrust Strike-slip Faults

doi:10.11885/j.issn.1674-5086.2023.09.14.02

Abstract

Abstract: The thrust strike-slip fault is widely distributed in the oil-rich structural zone, and quantitative characterization is of great significance to oil and gas exploration and development of oil-bearing basin, superposed coupling of horizontal extrusion stress and compression shear stress, the thrust displacement and slip displacement occur simultaneously in the thrust strike-slip fault system, which cause formation fragmentation, complex fault system, and disorderly logging and seismic response, and increases the difficulty of fault identification, combination, characterization and modeling. Aimed at the formation mechanism and the complexity of the thrust strike-slip fault system, a zoning-grading analysis and 3D panoramic characterization technology is developed to implement the quantitative analysis and 3D panoramic characterization of the study area—the lower plate of the Youshashan fault system of Yingdong Oilfield in Qaidam Basin. Relying on the zoning formation correlation, the key marked formation cross leading and zoning formation calibration technology is established, and solves the problem of difficult calibration and strong multiple solutions of the fragmentation formation, and the effective calibration of the six key marked formation and the full coverage tracking of the whole study area is implemented. The panoramic characterization, multi-scale and multi-type thrust strike-slip fault-fold step grid modeling and panoramic visualization characterization technology are used to the panoramic visual characterization of the thrust strike-slip fault profile-plane-3D multivision space of the study area.

Key words: thrust strike-slip fault, fault identification and combination, zoning-grading analysis, 3D panoramic characterization, Youshashan fault system

CLC Number:

TE122

OU Chenghua, WANG Zeyu, LIU Jincheng, LI Zhaoliang, MEI Hua. Zoning-grading Analysis and 3D Panoramic Characterization of Thrust Strike-slip Faults[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(3): 10-24.

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