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Structural analysis of strike-slip faults in the Tarim intracratonic basin

Due to the difficulty to identify small displacement strike-slip faults by low quality seismic data in the deep subsurface, fault mapping by seismic sections and horizontal seismic attributes is used to structural analysis of the strike-slip faults in the Tarim Basin. It is showed that there is a large circum-Manxi strike-slip fault system in the central Tarim, covered 5×10⁴ km² with NE and NW strike fault network. There are five type styles and eight kinds of typical strike-slip structures identified from seismic data. The strike-slip faults are divided into three areas of Tazhong, Manxi and Tabei from south to north, and divided into four classes according to the size of the fault. The strike-slip faults are mainly distributed in the Lower Paleozoic carbonates with dominated transcompressional faults, and inherited reactivations in Silurian-Devonian, Carboniferous-Permian and Mesozoic-Paleogene with transtensional faults. Large strike-slip faults are characterized by distinct segmentation. The strike-slip fault system formed in the Middle-Late Caledonian Period, and there were inherited reactivations in the End Caledonian-Early Hercynian Period, Late Hercynian Period and Yanshanian-Early Himalayan Period, following multiple inheritance and remodification. The linkage growth is the main mechanism for the formation of the small displacement and long length strike-slip fault zones. This study provides a new insight for the study of complicated structure in the sedimentary basin.