塔河油田碳酸盐岩岩块系统的参数法 分类及孔喉结构特征

Parameter classiflcation on carbonate rock system and pore-throat structure feature of carbonate matrix in Tahe Oilfield

关键词:  参数法分类  岩块系统  压汞法  孔喉结构  塔河油田  碳酸盐岩

Key words:  parameter classification  rock system  mercury injection method  pore-throat structure  Tahe Oilfield  carbonate rock

摘要:

塔河缝洞铟碳酸盐岩油藏属于强烈非均质性油藏，裂缝、溶洞的尺度与基质岩块的孔喉半径相差2 ~3个数量 级。采用参数法对碳酸盐岩基质岩块进行初步分类后，结合岩心铸体薄片、压汞法毛管压力和孔喉分布曲线,进一 步划分出3类基质岩块。结果表明,不同类别的孔喉结构特征决定了基质岩k系统的储集和渗流能力,喉道的连通 性是岩块系统渗流能力的决定性因素，即使孔隙中含油，若无有效的微裂缝和喉道沟通，也会极大地降低岩块系统 的采出程度。该研究成果为下一步探索适合于碳酸盐岩基质岩块的驱替条件、驱替方法、储层改造方法及对应采出 程度等,提供了重要的岩心参考依据。

Abstract:

Tahe Oilfield is of strong heterogeneous carbonate reservoir. Generally cavity diameter and fracture aperture is higher 2 or 3 orders of magnitude than pore throat size of matrix blocks. Carbonate matrix samples were preliminary classified depending on parameter classification and further classified to three different groups integrated with casting slices, mercury injection curves and pore throat size distribution. The results show that pore throat structure feature of different classification plays a dominating role in storage and percolation capability of carbonate matrix rocks and connectivity among throats is a governing factor for flowing characteristic of matrix blocks. In the case of oil bearing in pore space, little effective communicating with micro-fracture and throat could greatly reduce oil recovery of blocks. Research findings provide significant reference basis of carbonate core samples for following study of carrying out rock driving conditions, driving methods，reservoir treatment and corresponding recovery.