海上深水区碎屑岩储集层孔隙结构特征

Pore Structure Characteristics of Clastic Reservoir in Offshore Deepwater Area

海上深水区碎屑岩储集层具有良好的油气勘探潜力,但储集层质量受孔隙结构影响显著,因此,探究孔隙结构特征对深水碎屑岩油气藏高效开发至关重要。以南海深水区恩平组碎屑岩柱塞样为研究对象,通过铸体薄片分析(CTS)、核磁共振(NMR)、高压压汞(HPMI)以及恒速压汞(CRMI)等微观岩石物理实验对孔隙结构开展研究。结果表明,海上深水区碎屑岩可分为长石岩屑砂岩、岩屑石英砂岩及长石石英砂岩;不同孔隙类型和喉道的组合会导致孔隙系统的非均质性。

The clastic rock reservoir in offshore deepwater area has good oil and gas exploration potential,but the reservoir quality is significantly affected by pore structure.Therefore,it is essential to explore the characteristics of pore structure for efficient development of deepwater clastic rock reservoirs.This paper takes the plunger sample of the clastic rock of the Enping Formation in the deep water area of the South China Sea as the research object,and studies the pore structure through microscopic petrophysical experiments such as cast thin section analysis(CTS),nuclear magnetic resonance(NMR),high pressure mercury intrusion(HPMI) and constant rate mercury intrusion(CRMI).The results show that the clastic rocks in the offshore deepwater area can be divided into feldspathic lithic sandstone,lithic quartz sandstone and feldspathic quartz sandstone;The combination of different pore types and throats will lead to the heterogeneity of the pore system.