储量估算方法在缝洞型碳酸盐岩油藏的应用

缝洞型碳酸盐岩油藏储层非均质性强且各向异性,增加了该类油藏勘探、开发的难度,降低了各项资料录取的准确度,大大增加了储量估算的难度和不确定性。缝洞型碳酸盐岩油藏储量估算主要包括中国的静态法即容积法,产量递减法、水驱特征曲线法和物质平衡法等动态法以及SEC储量评估的静态法和动态法。由于各种方法所需的资料、适用性不同,决定了储量估算精度也有所不同。影响储量估算精度的主要因素包括油藏录取资料的代表性、对油藏认识的准确程度、储量估算方法的适用程度以及储量参数的合理确定性。在缝洞型碳酸盐岩油藏静态法储量估算中主要影响因素是有效厚度和孔隙度,核心问题是对有效储层孔隙结构特征的正确认识;动态法储量估算更应注重储量参数是否符合油藏开发特征。针对复杂的缝洞型碳酸盐岩油藏,通过多种方法和资料的综合应用、动态与静态估算方法的相互验证,对资料代表的局限性与各种方法的缺陷进行补充和完善,以获得最佳的储量估算结果。

Application of reserves estimation methods to fracturedvuggy carbonate reservoir

Fractured-vuggy carbonate reservoir features in heterogeneity and anisotropy,which makes it difficult to be explored and developed,and reduces the accuracy of data acquiring,and increases difficulties and uncertainties in reserves estimation.Multiple methods for reserves estimation have been implemented during the process of exploration and development,including the static vol-method,the dynamic production decline method,and the characteristic curve method of water drive,etc.Different methods require different data and estimating conditions,so,they vary a lot in accuracy.By comparing these methods and analyzing the ra-tionality of reserves data and parameters,this paper sums up the characteristics and conditions of various methods for different sta-ges of exploration and development and different estimating purposes.This could be good reference for making decisions regarding exploration and development of fractured-vuggy carbonate reservoir.