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Characteristics and Key Controlling Factors of the Interbedded-Type Shale-Oil Sweet Spots of Qingshankou Formation in Changling Depression

Author

Listed:
  • Liang Yang

    (Exploration and Development Research Institute, PetroChina Jilin Oilfield Company, Songyuan 138000, China)

  • Jilin Xing

    (Exploration and Development Research Institute, PetroChina Jilin Oilfield Company, Songyuan 138000, China)

  • Wei Xue

    (Exploration and Development Research Institute, PetroChina Jilin Oilfield Company, Songyuan 138000, China)

  • Lehua Zheng

    (School of Earth Sciences, China University of Petroleum (East China), Qingdao 266580, China)

  • Rui Wang

    (School of Earth Sciences, China University of Petroleum (East China), Qingdao 266580, China)

  • Dianshi Xiao

    (School of Earth Sciences, China University of Petroleum (East China), Qingdao 266580, China)

Abstract

Different types of shale-oil sweet spots have developed and are vertically stacked in multiple layers of the Qingshankou Formation in the Changling Depression, southern Songliao Basin. Furthermore, this area lacks a classification standard in the optimization of its shale-oil sweet-spot area/layers. Through relevant tests of the region in question’s organic geochemistry, physical properties, oiliness, and pore structure, this paper investigates the formation elements of shale-oil sweet spots. In addition, summaries of its enrichment-controlling factors are given, and the classification standard and evaluation method for understanding the comprehensive sweet spots of the interbedded-type shale oil are then established. The interbedded-type shale oil is enriched in the Qingshankou I Member in the Changling Depression, and it has the features of medium-to-high maturity, the development of inorganic pores and micro-cracks, as well as higher oil saturation and better oil mobility. The sweet-spot enrichment is affected by lamina type, sedimentary facies, maturity, and sand–shale combinations. Both silty-laminated felsic shale and argillaceous-laminated felsic shale, which are developed in semi-deep lakes, are favorable shale lithofacies as they have excellent brittleness and oil mobility. The high maturity and the interbedded combination of sand and shale ensure the efficient production of shale oil, among which the pure-shale section issues a continuous contribution to the production process. Combined with oil testing, sweet-spot classification standards and a comprehensive evaluation of interbedded-type shale oil were established. An area of 639.2 km 2 for the interbedded-type shale-oil sweet spots was preferred, among which type I (193 km 2 ) belonged to the combination of “good shale and good siltstone interlayers adjacent”, and type II belonged to “good shale and medium siltstone interlayers adjacent” combination (which have long-term low and stable production prospects). The research provides theoretical guidance on the effective exploration and development of the shale oil of the Qingshankou Formation in the Changling Depression.

Suggested Citation

  • Liang Yang & Jilin Xing & Wei Xue & Lehua Zheng & Rui Wang & Dianshi Xiao, 2023. "Characteristics and Key Controlling Factors of the Interbedded-Type Shale-Oil Sweet Spots of Qingshankou Formation in Changling Depression," Energies, MDPI, vol. 16(17), pages 1-20, August.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:17:p:6213-:d:1226163
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    References listed on IDEAS

    as
    1. Qiang Yan & Hongwei Ping & Xin Yang & Honglin Liu & Honghan Chen, 2023. "Evaluation of Shale Oil Mobility for the Eocene Shahejie Formation in Liutun Sag, Dongpu Depression, Bohai Bay Basin," Energies, MDPI, vol. 16(5), pages 1-20, February.
    2. Li, Jinbu & Wang, Min & Jiang, Chunqing & Lu, Shuangfang & Li, Zheng, 2022. "Sorption model of lacustrine shale oil: Insights from the contribution of organic matter and clay minerals," Energy, Elsevier, vol. 260(C).
    3. Yangbo Lu & Feng Yang & Ting’an Bai & Bing Han & Yongchao Lu & Han Gao, 2022. "Shale Oil Occurrence Mechanisms: A Comprehensive Review of the Occurrence State, Occurrence Space, and Movability of Shale Oil," Energies, MDPI, vol. 15(24), pages 1-16, December.
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