Abstract：The carbonate fracture-vug reservoirs of marine facies in Tarim Basin have complicated evolutionary mechanism and extremely high heterogeneity. Fracture-vug reservoirs in weathering crust of buried hills in the typical region of Tahe Oilfield is originated from carbonatic rocks which underwent meteoric water when they were lifted up to the ground. But a large number of non-exposed karst fracture-cug reservoirs exist in non￣exposed district where the Ordovician is complete in Halahatang Oilfield,northern Tarim Basin. Based on ananlysis of reginal geological background,selecting the typical oilfield wellblock,utilizing the petrological and geochemical data,the analysis of non￣exposed karst fracture￣vug reservoirs was carried out, and we concluded that:(1)Meteoric water is the key karst fluid in non￣exposed district,and the hydrothermal fluid have no influence on the formation of the karst reservoirs.(2)There exists structural fractures of two periods and three levels,and strike-slip faults of three periods and two levels in non￣exposed district,and the faults and associated structure fracture is the necessary conditions for the development of karst fracture-vug reservoirs.(3)The fracture-vug reservoirs can be divided into four types,including caves controlled by faults and rivers in early phase,caves controlled by faults in late phase,fracture-vug in early stage and micro fracture-vug in late stage.(4)The development of non-exposed karst fracture-vug reservoirs includes three stages in sequence,including faults forming in the mid-Caledonian,river system incision and dissolution during the depositional period of Lianglitage Formation,faults forming in late Caledonian-early Hercynian. The study made a deeper understanding of fracture-vug reservoir��s formation mechanism and broadened the thought in exploration and production in fracture-vug reservoir.
Liao Tao,Hou Jiagen,Chen Lixin et al. Fault controlling on non-exposed karst fracture-vug reservoirs of the Ordovician in Halahatang Oilfield,northern Tarim Basin[J]. JOPC, 2016, 18(2): 221-235.
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