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Title: Evolution and characteristics of sedimentary systems during fault-depressed transition in Songliao Basin—Case study of the Denglouku formation in the southeast uplift region
Authors: Li, Zhan-dong
Li, Chun-xu
Li, Wei
Li, Li
Liu, Yi-kun
Hou, Zheng-meng
Keywords: Songliao Basin;The southeast uplift region;Cretaceous;Denglouku formation;Sedimentary facies
Issue Date: Dec-2018
Publisher: NISCAIR-CSIR, India
Abstract: This study analyzes the sedimentary characteristics and evolution of Denglouku formation. There are 5 types of subfacies developed: alluvial fan, fan delta, braided river, braided river delta and lacustrine facies. Influenced by tectonic activity, the sedimentary facies types are different in different sedimentary periods. In the early stage of the transition period named D1 member period, the deposition is significantly controlled by the fault depression, resulting in rapid unloading of the sediments. Five large-scale divided faulted depressions and two small faulted depressions have been developed. During the late stage of the transition period named D2 member period, the unified sediment unloading area is formed, and the lake area expanded, which developed alluvial fan, fan delta, braided river, braided river delta and lacustrine deposits. Taking the community of the floodplain and lacustrine contact zone as a boundary, the western part mainly developed alluvial fan and braided river sedimentary system from the provenance highland in the western and northern, the east part mainly developed lacustrine facies massively. Among them, the fan delta front and braided delta front subfacies are the main enrichment reservoirs for oil and gas, which is the favorable subfacies of oil and gas exploration in the future.
Page(s): 2353-2368
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.47(12) [December 2018]

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