Abstract：Based on the outcrop profile and regional geological data,the sedimentary evolution of Carboniferous-Permian in western Wushi sag was investigated. The Carboniferous western Wushi sag is located between the southern Tianshan residual sea basin and Keping-Wensu uplift,and is quite different from that of the inner Tarim Basin. During the early stage of Early Carboniferous,as the boundary of Suogedangtawu Fault in the northern margin of Keping-Wensu uplift controlling the sedimentation,there were shallow shelf environment that was dominated by shore littoral and diamictic carbonate. During the late stage of Early Carboniferous,the first marine-flooding made Keping-Wensu uplift partially submerged,which was accompanied by a strong subsidence,forming bathyal slope environment. The flysch deposition of the proximal-distal turbidite fan typified by Kulu Formation and Suogedangtawu Formation are seen to occur within such bathyal slope environment,and continued until the early stage of Late Carboniferous. During the late stage of Late Carboniferous,another large-scale transgression occurred in this area,which,in turn,made Keping-Wensu uplift mostly submerged. The original uplift,then shifted to the open platform environments. Typical platform margin reef were well developed in the north and west edge of the study area,and northward extended to Kezibulake area,outward to the reef front slope and shallow shelf environment,which was continued until the early stage of Middle Permian. After the Middle Permian,due to the large-scale intracontinental volcano activity,large-scale regression developed in this area. At the end of the Late Permian,accompanied by the combination of Tarim Plate and Middle Tianshan Massif,the South Tianshan Ocean disappeared and formed the ancient Tianshan orogenic belt of the Hercynian period. This completely ended the marine sediments and entered the stage of continental deposition. In addition to the Carboniferous shoreline facies sandstones,the reef limestone reservoirs of the Early-Middle Permian were widely distributed,the buried depth of the reservoirs is relatively shallow and the physical properties are relatively good,giving rise to an important target for oil and gas exploration.
Jia Jin-Hua,Zhang Li-Ping,Chen Xiu-Yan. Sedimentary evolution of the Carboniferous-Permian in western Wushi sag,Tarim Basin[J]. JOPC, 2018, 20(3): 423-434.
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