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<p>Recent petroleum reserves preserved within reservoirs formed by braided river delta deposits have been confirmed in the Toutunhe Formation. However, sedimentological heterogeneities play a critical role in determining reservoir performance. Geological and geophysical data are utilized to investigate the genetic relationships within the reservoir. The results identify two sedimentary sub-facies and three sedimentary microfacies. The braided river delta plain is characterized by short sediment transport distances, low compositional maturity of rocks, and high structural maturity. The sediment is primarily sandstone, with lithic sandstone being the dominant rock type. Carbonate cementation is prevalent, with pore-filling cement as the main cement type and mud as the primary mixed matrix component. Clay minerals are dominated by kaolinite, followed by illite and chlorite. Kaolinite and chlorite content show a positive correlation with reservoir porosity, while illite content is negatively correlated. Two types of reservoir pores are identified: primary pores and secondary pores. Primary pores are mainly intergranular pores, often associated with quartz and chlorite, while secondary pores are primarily intergranular dissolution pores, associated with feldspar and kaolinite. Insights into sedimentary characteristics and diagenetic processes controlling reservoir heterogeneity in braided river delta deposits can aid in further petroleum exploration in this region and similar areas.</p>

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The sedimentological heterogeneities and responses to controlling factors in Toutunhe Formation of Xiayan Rise, Junggar Basin

  • 期刊论文

  • 发表日期：

    2025年5月23日

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  • Nai-xiang He,
  • Xiang Li,
  • Ya-jie Ding,
  • Rui Qi,
  • Gang Xu,
  • Zi-jian Han,
  • Chao Hou,
  • Lei Xie

摘要

Recent petroleum reserves preserved within reservoirs formed by braided river delta deposits have been confirmed in the Toutunhe Formation. However, sedimentological heterogeneities play a critical role in determining reservoir performance. Geological and geophysical data are utilized to investigate the genetic relationships within the reservoir. The results identify two sedimentary sub-facies and three sedimentary microfacies. The braided river delta plain is characterized by short sediment transport distances, low compositional maturity of rocks, and high structural maturity. The sediment is primarily sandstone, with lithic sandstone being the dominant rock type. Carbonate cementation is prevalent, with pore-filling cement as the main cement type and mud as the primary mixed matrix component. Clay minerals are dominated by kaolinite, followed by illite and chlorite. Kaolinite and chlorite content show a positive correlation with reservoir porosity, while illite content is negatively correlated. Two types of reservoir pores are identified: primary pores and secondary pores. Primary pores are mainly intergranular pores, often associated with quartz and chlorite, while secondary pores are primarily intergranular dissolution pores, associated with feldspar and kaolinite. Insights into sedimentary characteristics and diagenetic processes controlling reservoir heterogeneity in braided river delta deposits can aid in further petroleum exploration in this region and similar areas.