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Transtensional faults are well developed in the S Block of the South Asia area, which have an important impact on the hydrocarbon accumulation. However, the transtensional fault structure is very complex. Based on drilling and seismic data interpretation results, faults are divided into three typical types in the Lower Cretaceous, which can help to understand the complex fault system. The main faults are distributed in the NNW-SSE direction and parallel arrangement with dextral strike-slip shear characteristics, which determines the development of the tectonic belt. The secondary faults are often associated with the main faults, often composed of multiple branch faults. | Turkish Journal of Earth Sciences Turkish J Earth Sci 2021 30 899-915 http journals.tubitak.gov.tr earth TÜBİTAK Research Article doi 10.3906 yer-2104-13 Structural characteristics of transtensional fault system and its implication for hydrocarbon accumulation in S Block South Asia area 1 2 3 4 1 2 Yuwen DONG Iftikhar SATTI Maman HERMANA Xu CHEN 1 Cooperative Innovation Center of Unconventional Oil and Gas Ministry of Education amp Hubei province Yangtze University Wuhan China 2 Hubei Key Laboratory of Petroleum Geochemistry and Environment Yangtze University Wuhan China 3 Institute of Geology University of Azad Jammu amp Kashmir Muzaffarabad Pakistan 4 Department of Geosciences University Technology PETRONAS Perak Malaysia Received 14.04.2021 Accepted Published Online 07.09.2021 Final Version 22.11.2021 Abstract Transtensional faults are well developed in the S Block of the South Asia area which have an important impact on the hydrocarbon accumulation. However the transtensional fault structure is very complex. Based on drilling and seismic data interpretation results faults are divided into three typical types in the Lower Cretaceous which can help to understand the complex fault system. The main faults are distributed in the NNW-SSE direction and parallel arrangement with dextral strike-slip shear characteristics which determines the development of the tectonic belt. The secondary faults are often associated with the main faults often composed of multiple branch faults. The complexity of the fault system is further aggravated by the small interlayer faults. Based on balanced cross- section technique analysis the fault evolution has experienced five geological periods which is closely related to the Indo-Pakistan plate tectonics and the Indus Basin evolution. In the diagonal extension stage of the Late Cretaceous the fault activity was very strong which had a significant impact on the tectonic pattern of horst-graben structures and locally complex faulted blocks
