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<p>Temporal coupling between reservoir densification and hydrocarbon charging critically controls accumulation efficiency in tight sandstone systems but remains poorly constrained in the Yangxia Sag, Kuqa Depression. This study investigates Jurassic tight reservoirs in the eastern Yangxia Sag using integrated petrographic observations, fluid inclusion analysis, burial–thermal history modeling, and quantitative porosity evolution reconstruction.</p><p>The Jurassic reservoirs are dominated by lithic sandstones with low porosity (1.0–11.3%) and very low to locally fracture-enhanced permeability, and their pore systems are mainly composed of dissolution pores and microfractures. Quantitative reconstruction indicates that the Ahe Formation entered the tight reservoir stage at ∼6.0 Ma, whereas the Yangxia Formation became tight at ∼4.5 Ma.</p><p>Fluid inclusion microthermometry reveals two distinct hydrocarbon charging episodes, including an early oil charging phase (5.2–3.8 Ma in the Ahe Formation; 4.3–3.8 Ma in the Yangxia Formation) and a later gas charging phase (2.8–2.3 Ma and 3.0–2.5 Ma, respectively). These results indicate that early oil charging partly overlapped with reservoir densification, whereas late gas charging mainly postdated reservoir tightening.</p><p>The source–reservoir configuration and fracture development jointly controlled hydrocarbon accumulation. Early oil charging benefited from relatively higher porosity, whereas late-stage gas accumulation depended mainly on microfracture networks that enhanced reservoir connectivity. These findings provide a quantitative basis for evaluating charging–densification mismatch and tight gas enrichment in structurally complex foreland basins.</p>

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Hydrocarbon charging dynamics and its coupling with reservoir densification in a tight sandstone system: Insights from the Jurassic of the Yangxia Sag, Kuqa Depression

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Chang-chao Chen,
  • Jun Li,
  • Jinz-hou Wang,
  • Ling Li,
  • Hao-ran Gao,
  • Zheng-lian Pang,
  • Xiu-yan Chen,
  • Min Yang

摘要

Temporal coupling between reservoir densification and hydrocarbon charging critically controls accumulation efficiency in tight sandstone systems but remains poorly constrained in the Yangxia Sag, Kuqa Depression. This study investigates Jurassic tight reservoirs in the eastern Yangxia Sag using integrated petrographic observations, fluid inclusion analysis, burial–thermal history modeling, and quantitative porosity evolution reconstruction.

The Jurassic reservoirs are dominated by lithic sandstones with low porosity (1.0–11.3%) and very low to locally fracture-enhanced permeability, and their pore systems are mainly composed of dissolution pores and microfractures. Quantitative reconstruction indicates that the Ahe Formation entered the tight reservoir stage at ∼6.0 Ma, whereas the Yangxia Formation became tight at ∼4.5 Ma.

Fluid inclusion microthermometry reveals two distinct hydrocarbon charging episodes, including an early oil charging phase (5.2–3.8 Ma in the Ahe Formation; 4.3–3.8 Ma in the Yangxia Formation) and a later gas charging phase (2.8–2.3 Ma and 3.0–2.5 Ma, respectively). These results indicate that early oil charging partly overlapped with reservoir densification, whereas late gas charging mainly postdated reservoir tightening.

The source–reservoir configuration and fracture development jointly controlled hydrocarbon accumulation. Early oil charging benefited from relatively higher porosity, whereas late-stage gas accumulation depended mainly on microfracture networks that enhanced reservoir connectivity. These findings provide a quantitative basis for evaluating charging–densification mismatch and tight gas enrichment in structurally complex foreland basins.