莺歌海盆地乐东区黄流组深层碎屑岩储层特征及优质储层控制因素
- 赖维成1,
- 李雪哲2,
- 熊连桥1,
- 谢晓军3,
- 唐武3,
- 王艳忠4, ,
- 武爱俊3,
- 白海强5,
- 刘子玉1,
- 王诗琪5,
- 王铭乾6,
- 赵振5
- 收稿日期:
2025-09-22
- 网络出版日期:
2026-05-15
摘要: 【目的】莺歌海盆地乐东区黄流组深层碎屑岩优质储层主控因素尚不明确，制约了深层天然气勘探开发。【方法】综合应用岩心观察、铸体薄片分析、扫描电镜观察、阴极发光薄片鉴定、流体包裹体均一温度测试、流体包裹体PVTx法和公式法古压力恢复、压实模拟实验等多种方法，对储层岩石学、成岩作用、储集空间、地层压力等特征及优质储层控制因素进行了系统研究，建立了优质储层成因模式。【结果】莺歌海盆地乐东区黄流组深层碎屑岩储层岩石类型以长石质石英砂岩为主，压实作用以中等—强压实为主，溶解作用较弱，仅在局部发育长石颗粒和生物碎屑的溶蚀，胶结作用以方解石胶结为主，其次为硅质胶结；储集空间以原生孔隙为主导，发育少量长石溶蚀孔隙。岩相类型控制初始孔隙度和抗压实能力，决定储层的物性基础。成岩作用驱动了储层物性分异，其中压实和胶结作用是储层致密化的主因，溶解作用更多表现为孔隙类型与连通性的局部调节、增孔作用贡献有限。6 Ma~现今 由欠压实作用、生烃作用形成并自约 2300 m 起传递的中—强超压显著抑制了压实与胶结作用强度，有效保存了早期原生孔隙，成为深层优质储层形成的关键因素。孔隙度随埋深整体下降，但在约 3300 m以深下降速率显著减缓，埋深大于4000 m砂岩仍以原生孔隙为主，表明深层仍具优质储层发育潜力。【结论】基于上述认识，建立了“岩相为基础—成岩促分异—超压保孔”的深层优质碎屑岩储层成因模式，超压条件、中—粗砂岩岩相以及中等压实、中等胶结成岩作用是乐东区黄流组深层碎屑岩优质储层形成的主要控制因素。研究成果为南海深水区深层天然气优质储层预测与高效勘探开发提供了理论依据与技术支撑。
Reservoir Characteristics and Controls on High-Quality Deep Clastic Reservoirs in the Huangliu Formation, Ledong Area, Yinggehai Basin
- Received Date:
2025-09-22
- Available Online:
2026-05-15
Abstract: Abstract：[Objective] The primary controls on high-quality deep clastic reservoirs in the Huangliu Formation (Ledong area, Yinggehai Basin) remain poorly constrained, limiting deep gas exploration. [Methods] We integrate core description, blue-epoxy petrography, SEM, cathodoluminescence, fluid-inclusion homogenization temperatures, PVTx- and equation-based paleo-pressure reconstructions, and compaction simulation to characterize lithology, diagenesis, pore systems, and formation pressure, and to establish a genetic model. [Results and Discussions] Reservoirs are dominated by feldspathic quartz sandstones. Diagenesis is marked by moderate–strong compaction, weak dissolution (local leaching of feldspar grains and bioclasts), and predominantly calcite cementation with subordinate silica. Pore systems are chiefly primary intergranular pores with minor feldspar-dissolution pores. Lithofacies set the baseline porosity and compaction resistance, whereas diagenesis drives petrophysical differentiation: compaction and cementation govern tightness, while dissolution mainly modulates pore type and connectivity with limited net porosity gain. Since ~6 Ma, medium–strong overpressure—generated by undercompaction and hydrocarbon generation and transmitted upward from ~2300 m—suppressed compaction and cementation, preserving early primary porosity. Porosity declines with burial but the rate diminishes below ~3300 m; even at >4000 m, sandstones remain primary-pore dominated, indicating substantial deep-reservoir potential. [Conclusions] We propose a “facies foundation–diagenetic differentiation–overpressure preservation” model, identifying overpressure conditions, medium- to coarse-grained lithofacies, and moderate compaction/cementation as the principal controls. These findings provide a basis for predicting high-quality deep gas reservoirs and support efficient exploration in the deep-water South China Sea.
Keywords: Yinggehai Basin; Huangliu Formation; deep reservoirs; reservoir quality; lithofacies; diagenesis; overpressure
赖维成, 李雪哲, 熊连桥, 谢晓军, 唐武, 王艳忠, 武爱俊, 白海强, 刘子玉, 王诗琪, 王铭乾, 赵振. 莺歌海盆地乐东区黄流组深层碎屑岩储层特征及优质储层控制因素[J]. 沉积学报. doi: 10.14027/j.issn.1000-0550.2026.010
| 引用本文: |
赖维成, 李雪哲, 熊连桥, 谢晓军, 唐武, 王艳忠, 武爱俊, 白海强, 刘子玉, 王诗琪, 王铭乾, 赵振. 莺歌海盆地乐东区黄流组深层碎屑岩储层特征及优质储层控制因素[J]. 沉积学报. doi: 10.14027/j.issn.1000-0550.2026.010
|
Reservoir Characteristics and Controls on High-Quality Deep Clastic Reservoirs in the Huangliu Formation, Ledong Area, Yinggehai Basin[J]. Acta Sedimentologica Sinica. doi: 10.14027/j.issn.1000-0550.2026.010
| Citation: |
Reservoir Characteristics and Controls on High-Quality Deep Clastic Reservoirs in the Huangliu Formation, Ledong Area, Yinggehai Basin[J]. Acta Sedimentologica Sinica. doi: 10.14027/j.issn.1000-0550.2026.010
|
点击查看大图
下载:
