Characteristics of fault accommodation structure-slope break zone and its control on reservoir distribution in southern subsag of Uliastai Sag，Erlian Basin
Wang Youzhi, Zhang Weihai
College of Geo-Resources and Information， China University of Petroleum（East China），Dongying, 257061,Shandong
Abstract Based on restoration of the Early Cretaceous palaeogeomorphology of southern subsag of Uliastai Sag，researches have been carried out on the relationship between characteristics of fault accommodation structure-slope break zone， depositional systems， and reservoir distribution.The analyses show that the compound structural assemblage controls the shape of sandbody and reservoir distribution.There are accommodation structure-upper slope break， middle slope break and lower slope break spreading in NNE direction in southern subsag in the study area during the Early Cretaceous.The accommodation structure-slope break zone controls the formation of depositional systems. There are large-scaled fan delta—sublacustrine fan depositional system；The accommodation structure-slope break zone controls shapes of sandbodies，mainly seven small-scaled sublacustrine fan sandbodies were distributed in a tongue-like shape.Multistage slope breaks provide spaces for sediments deposition. The accommodation structure also controls provenance and drainage system，the major reservoir types are fan delta front and sublacustrine fan sandbodies controlled by the accommodation structure-slope break zone in southern subsag of the Uliastai Sag.The compound structure with different orders lead to the differences of reservoir types and their petrophysical property.
About author: Wang Youzhi was born in 1982.Now he is a postgraduate in China University of Petroleum(East China)，and is mainly engaged in researches of formation and distribution of oil-gas pool，E-mail: hanbing_8765@163.com。
Cite this article:
Wang Youzhi,Zhang Weihai. Characteristics of fault accommodation structure-slope break zone and its control on reservoir distribution in southern subsag of Uliastai Sag，Erlian Basin[J]. JOURNAL OF PALAEOGEOGRAPHY, 2009, 11(5): 573-580.
Wang Youzhi,Zhang Weihai. Characteristics of fault accommodation structure-slope break zone and its control on reservoir distribution in southern subsag of Uliastai Sag，Erlian Basin[J]. JOPC, 2009, 11(5): 573-580.
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