1. Sichuan Provincial Key Laboratory of Natural Gas Geology, Chengdu, Sichuan 610500, China; 2. School of Geosciences and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China; 3. Exploration and Development Research Institute, PetroChina Southwest Oil & Gas Field Company, Chengdu, Sichuan 610041, China
Abstract：Natural gas is continuously discovered in the Permian Qixia Formation in the Gaoshiti-Moxi area of the Sichuan Basin, and thus this area has great potential for oil and gas exploration. Transtensional strike-slip faults control the distribution of oil and gas, but there is little research on the characteristics of strike-slip faults, and it is insufficient to identify strike-slip faults only according to seismic profiles. Therefore, starting with the mecha-nical mechanism of the formation of strike-slip faults, this paper analyzes the structural styles and structural characteristics and guides the identification of strike-slip faults with the dolphin effect and ribbon effect. Moreover, the advantages and disadvantages of various seismic attributes are analyzed and compared, and the seismic attributes most suitable for strike-slip fault identification are selected. The study believes that the strike-slip faults in the Gaoshiti-Moxi area are mainly controlled by the single shear mode of Riedel shear. On the section, the structural styles include the positive flower structure, linear structure, Y-shaped structure, and the superposition of multi-stage flower structures, which are characterized by small fault displacement, unobvious horizon dislocation, and dominant event bending disturbance. On the plane, structural styles include the braided structure, en-echelon structure, and horsetail structure, and the dolphin effect and ribbon effect appear along the fault strike and the fault dipping direction, respectively. The seismic attribute ana-lysis by the waveform similarity-based coherence algorithm has a poor identification effect of strike-slip faults, while the curvature and ant body attributes can clearly identify the planar distribution characteristics of strike-slip faults. This method can provide a reference for the identification of strike-slip faults in other similar areas.
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