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    Volume 48 Issue 1
    Jan.  2023
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    Article Navigation >  Earth Science  > 2023  >  48(1): 30-48
    Liu Huimin, Zhang Shun, Wang Xuejun, Zhang Pengfei, Li Junliang, Wang Yong, Wei Xiaoliang, Yin Yan, Zhu Deyan, 2023. Types and Characteristics of Shale Lithofacies Combinations in Continental Faulted Basins: A Case Study from Upper Sub-Member of Es4 in Dongying Sag, Jiyang Depression. Earth Science, 48(1): 30-48. doi: 10.3799/dqkx.2022.183
    Citation: Liu Huimin, Zhang Shun, Wang Xuejun, Zhang Pengfei, Li Junliang, Wang Yong, Wei Xiaoliang, Yin Yan, Zhu Deyan, 2023. Types and Characteristics of Shale Lithofacies Combinations in Continental Faulted Basins: A Case Study from Upper Sub-Member of Es4 in Dongying Sag, Jiyang Depression. Earth Science, 48(1): 30-48. doi: 10.3799/dqkx.2022.183
    shu

    Types and Characteristics of Shale Lithofacies Combinations in Continental Faulted Basins: A Case Study from Upper Sub-Member of Es4 in Dongying Sag, Jiyang Depression

    doi: 10.3799/dqkx.2022.183
    • 1.

      Shengli Oilfield Company, SINOPEC, Dongying 257000, China

    • 2.

      Research Institute of Petroleum Exploration and Development, Shengli Oilfield Company, SINOPEC, Dongying 257015, China

    • 3.

      Working Stations for Postdoctors of Shengli Oilfield, SINOPEC, Dongying 257015, China

    • Received Date: 2022-01-21
      Available Online: 2023-02-01
    • Publish Date: 2023-01-25
      Abstract
    • There are no relevant research results and technical methods on the classification of shale lithofacies combinations in continental faulted basins, and the basic characteristics of different shale lithofacies assemblages need to be further clarified. Based on the fine observation and description of the core samples, the basic rock and lithofacies types of the sampled shale sections were identified by observing rock thin sections and performing X-ray-based full-rock mineral diffraction analysis. By analyzing the major mineral composition and major and trace element contents of the samples, information about the sedimentary paleoenvironment of the Jiyang Depression was extracted. According to the basic characteristics of the four paleoenvironment factors (paleoclimate, paleosource, paleosalinity, paleowater depth), the shale stratigraphy of the Upper Sub-member of the Fourth Member of Shahejie Formation (Es4s) in the Dongying Sag was divided into lithofacies combinations based on the principle of sedimentary environment similarity and internal structure uniformity. A lithofacies combination classification scheme based on sedimentary environment control was established, and combined with reservoir and organic geochemical analysis, the main lithofacies combination reservoir and oil-bearing characteristics were clarified. Results show that: (1) Es4s shale in the Dongying Sag is a typical carbonate-rich shale (carbonate shale) and mixed shale, with significant lamination features, various types of pores, well-developed bedding and structural fractures, high organic matter abundance, moderate-to-low evolutionary degree, deep burial depth and high pressure coefficient. (2) Based on sedimentary structural position and paleoenvironment, the Es4s shale in the Dongying Sag can be divided into 8 lithofacies combinations. In the central part of the basin, the matrix carbonate shale lithofacies combination is dominant, with some interbedded block dolomite shale lithofacies combination. In the northern steep slope belt, the sandstone interbedded shale lithofacies combination is mainly developed, and in the southern gentle slope belt, the block dolomite shale interbedded lithofacies combination and the laminar carbonate mudstone and dolomite shale interbedded lithofacies combination are mainly developed. (3) In general, as the main body of fine-grained sediments, the Es4s matrix shale stratigraphy in the center of the Dongying Sag develops from bottom to top: laminar carbonate shale interbedded with block dolomite shale lithofacies, laminar carbonate shale and dolomite shale interbedded lithofacies, laminar carbonate shale and carbonate mudstone interbedded lithofacies, laminar carbonate shale interbedded with carbonate mudstone lithofacies, laminated carbonate shale and carbonate mudstone interbedded lithofacies, laminated carbonate shale interbedded with carbonate mudstone lithofacies, etc., revealing the change in sedimentary paleoenvironment from arid, brackish water, semi-deep water, and less source rocks to semi-wet, semi-brackish water, deep water, and more source rocks. (4) The laminar carbonate shale interbedded with carbonate mudstone lithofacies combination and the laminar carbonate shale and carbonate mudstone interbedded lithofacies combination are the most developed, with a variety of reservoir space types, high proportion of large-diameter pores and good connectivity. The laminar carbonate shale and carbonate mudstone interbedded lithofacies combination has relatively high oil saturation, and is also a favorable lithofacies combination type for achieving breakthroughs in shale oil in the Jiyang Depression. The laminar carbonate shale interbedded with block-type dolomite shale lithofacies combination has good oil-bearing and brittle properties. Further analysis of the basic geological characteristics and oil-bearing characteristics of different lithofacies combinations and determination of the development and distribution characteristics of the main shale lithofacies combinations are of practical significance for exploring shale oil in continental faulted basins.

       

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