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Sedimentary facies and depositional model of shallow water delta dominated by fluvial for Chang 8 oil-bearing group of Yanchang Formation in southwestern Ordos Basin, China

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Abstract

A systematic analysis of southwestern Ordos Basin’s sedimentary characteristics, internal architectural element association styles and depositional model was illustrated through core statistics, well logging data and outcrop observations in Chang 8 oil-bearing group. This analysis indicates that shallow water delta sediments dominated by a fluvial system is the primary sedimentary system of the Chang 8 oil-bearing group of the Yanchang Formation in southwestern Ordos Basin. Four microfacies with fine grain sizes are identified: distributary channels, sheet sandstone, mouth bar and interdistributary fines. According to the sandbody’s spatial distribution and internal architecture, two types of sandbody architectural element associations are identified: amalgamated distributary channels and thin-layer lobate sandstone. In this sedimentary system, net-like distributary channels at the delta with a narrow ribbon shape compose the skeleton of the sandbody that extends further into the delta front and shades into contiguous lobate distribution sheet sandstone in the distal delta front. The mouth bar is largely absent in this system. By analyzing the palaeogeomorphology, the palaeostructure background, sedimentary characteristics, sedimentary facies types and spatial distribution of sedimentary facies during the Chang 8 period, a distinctive depositional model of the Chang 8 shallow water fluvial-dominated delta was established, which primarily consists of straight multi-phase amalgamated distributary channels in the delta plain, net-like distributary channels frequently diverting and converging in the proximal delta front, sheet sandstones with dispersing contiguous lobate shapes in the distal delta front, and prodelta or shallow lake mudstones.

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Authors and Affiliations

  1. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education (China University of Geosciences (Wuhan)), Wuhan, 430074, China

    Lin Chen  (陈林), Yong-chao Lu  (陆永潮), Yi-quan Ma  (马义权), Dan Rao  (饶丹) & Li Peng  (彭丽)

  2. Faculty of Earth Resources, China University of Geosciences (Wuhan), Wuhan, 430074, China

    Lin Chen  (陈林), Yong-chao Lu  (陆永潮), Yi-quan Ma  (马义权), Dan Rao  (饶丹) & Li Peng  (彭丽)

  3. Exploration and Development Institute, Huabei Branch Company of SINOPEC, Henan, 450006, China

    Ji-yuan Wu  (吴吉元) & Lu Liu  (刘璐)

  4. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, 610059, China

    Feng-cun Xing  (邢凤存)

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  1. Lin Chen  (陈林)
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Correspondence to Lin Chen  (陈林).

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Foundation item: Project(SQ2013CB021013) supported by the National Key Basic Research Program of China; Project(41002045) supported by the National Natural Science Foundation of China

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Chen, L., Lu, Yc., Wu, Jy. et al. Sedimentary facies and depositional model of shallow water delta dominated by fluvial for Chang 8 oil-bearing group of Yanchang Formation in southwestern Ordos Basin, China. J. Cent. South Univ. 22, 4749–4763 (2015). https://doi.org/10.1007/s11771-015-3027-3

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  • DOI: https://doi.org/10.1007/s11771-015-3027-3

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