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Title:: Structural Characteristics and Petroleum Geological Significances of Mazhatage Fault Belt in Tarim Basin

Author(s):: GUO Ying; TANG Liang-jie; YU Teng-xiao; LI Jiu-mei; YUE Yong; 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China; 2. Basin and Reservoir Research Center, China University of Petroleum, Beijing 102249, China; 3. Northwest Oilfield Company, SINOPEC, Urumqi 830011, Xinjiang, China

Keywords:: fault structure; deformation characteristic; stratification difference; segmentation difference; structural evolution; petroleum geology; Tarim Basin

Abstract:: Based on the latest elaborations of seismic data, the fault development model, active stages and tectonic evolution of Mazhatage fault belt in Tarim Basin were discussed in terms of unconformities, strata thickness and syntectonic strata. Mazhatage fault belt has clear layered and segmentation characteristics. Deep listric thrust fault mainly lies in the western and middle sections, thrusting strike-slip faults gradually change into strike-slip thrust fault from the west to the east, and the shallow listric thrust develops in the whole fault belt. The study area has experienced four deformation stages and four fault systems, the Late Ordovician-Devonian listric thrust fault, the Permian-Triassic inherited active listric thrust fault, and the Late Paleogene thrusting strike-slip thrust fault (or strike-slip thrust fault) and the Late Pliocene-Holocene thrust fault have been recognized. Mazhatage fault belt, which is an accompanied fault of Hetian palaeohigh in Upper Ordovician-Devonian and Permian-Triassic, provides limited communications between the source rock and reservoir, and could damage paleo-oil-gas reservoirs. Then, it evolves into a boundary fault on the south side of Bachu uplift in Late Paleogene, becoming a favorable channel for natural gas transportation; and a good structural trap is formed in the middle and west sections of the fault, showing a good spatial-temporal relationship with the main accumulation period during the Himalayan.