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Sedimentary Characteristics and Their Controlling Factors of Lower Cretaceous Fan Deltas in Saidong Sub-Sag of Saihantala Sag, Erlian Basin, Northeastern China

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  • Bo Yan

    (College of Earth Sciences, Jilin University, Changchun 130061, China
    School of Geosciences, Northeast Petroleum University, Daqing 163318, China)

  • Hongqi Yuan

    (School of Geosciences, Northeast Petroleum University, Daqing 163318, China)

  • Xuanlong Shan

    (College of Earth Sciences, Jilin University, Changchun 130061, China)

  • Tianqi Zhou

    (School of Geosciences, Northeast Petroleum University, Daqing 163318, China)

  • Shengfei Liu

    (School of Geosciences, Northeast Petroleum University, Daqing 163318, China)

Abstract

Fan deltas of the Lower Cretaceous area in Saihantala sag, Erlian Basin have been identified as major petroleum exploration opportunities. The sedimentary evolution is, however, still debatable, which hinders insights into its controlling factors. This research employed new core observations, thin section observations, and grain size analyses of 28 wells in the Saidong sub-sag, together with numerous borehole and seismic data points, to explore lithofacies types, subfacies, and microfacies characteristics, thus leading to a further investigation of the sedimentary facies evolution of the sag and its controlling factors. The findings showed there are 3 categories, 12 sub-categories, and 20 fine lithofacies types in the Saidong sub-sag. Additionally, various sand-conglomerate lithofacies were characterized by lower composition and texture maturity. With dentate-shaped, box-bell-shaped, and other morphological well-logging responses, fan deltas were mostly developed in the A’ershan Formation and the Tengge’er Formation, which could be subdivided into three subfacies and eight microfacies. Given the sedimentary features and lithofacies characteristics of each microfacies, it can be determined that three main stages occurred in formations from the A’ershan to the Tengge’er: the water transgression, the water oscillation, and the water regression. Moreover, fan delta deposits were regulated primarily by semi-arid hygrothermal and semi-arid paleoclimate and paleotectonic factors.

Suggested Citation

  • Bo Yan & Hongqi Yuan & Xuanlong Shan & Tianqi Zhou & Shengfei Liu, 2022. "Sedimentary Characteristics and Their Controlling Factors of Lower Cretaceous Fan Deltas in Saidong Sub-Sag of Saihantala Sag, Erlian Basin, Northeastern China," Energies, MDPI, vol. 15(22), pages 1-27, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:22:p:8373-:d:967653
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    References listed on IDEAS

    as
    1. Entao Liu & Yong Deng & Xudong Lin & Detian Yan & Si Chen & Xianbin Shi, 2022. "Cenozoic Depositional Evolution and Stratal Patterns in the Western Pearl River Mouth Basin, South China Sea: Implications for Hydrocarbon Exploration," Energies, MDPI, vol. 15(21), pages 1-22, October.
    2. Zhenghong Yu & Si Chen & Weidong Xie & Shu’e Zhao & Jianghao Ma & Tianhao Gong, 2022. "Implication Linkage among Microfacies, Diagenesis, and Reservoir Properties of Sandstones: A Case Study of Dongying Formation, Nanpu Sag, Bohai Bay Basin," Energies, MDPI, vol. 15(20), pages 1-23, October.
    3. Nadir Fawad & Taixun Liu & Daidu Fan & Qazi Adnan Ahmad, 2022. "Sedimentary Facies Analysis of the Third Eocene Member of Shahejie Formation in the Bonan Sag of Bohai Bay Basin (China): Implications for Facies Heterogeneities in Sandstone Reservoirs," Energies, MDPI, vol. 15(17), pages 1-29, August.
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