基于核磁共振的湖相致密储层储集空间类型特征及开发潜力评价:以柴达木盆地英西地区为例

来源期刊:中南大学学报(自然科学版)2021年第2期

论文作者:吴克柳 张庆辉 张磊 屈信忠 陈晓冬 高发润 谭武林

文章页码:498 - 509

关键词:柴达木盆地;英西;核磁共振;储集空间;开发潜力

Key words:Qaidam Basin; Yingxi; NMR; reservoir space; development potential

摘    要:选取英西地区湖相致密储层岩心进行核磁共振实验;基于不同湖相致密储层储集空间半径和连续性差异,定义晶间孔、溶蚀孔和裂缝,进而结合核磁共振原理,建立核磁共振识别湖相致密储层储集空间类型的方法;根据识别结果,提出湖相致密储层开发效果评价和油井产能预测的方法。研究结果表明:湖相致密储层岩心弛豫时间T2谱呈现双峰或3峰,不存在单峰,第1峰峰值对应的弛豫时间T2平均为8.65 ms,第2峰峰值T2平均为657.29 ms,不同峰之间连续性差异大,储集空间分布特征复杂;柴达木盆地英西地区湖相致密储层具有不同储集空间半径分布特征,晶间孔半径峰值平均为0.05 μm,溶蚀孔半径峰值平均为7.52 μm,裂缝半径峰值大于40 μm;湖相致密储层渗流能力与“溶蚀孔+裂缝”的发育程度成正比,且盐间“溶蚀孔+裂缝”发育程度比盐下的好,证明了盐间渗流能力比盐下的强;当含油饱和度相近时,盐间开发效果比盐下的好,利用“溶蚀孔+裂缝”占比,并结合含油饱和度,实现对湖相致密储层开发效果的评价和油井产能的预测。

Abstract: The core from lacustrine tight oil reservoir in Yingxi area was studied by nuclear magnetic resonance (NMR) experiment. Based on the differences in size and continuity of different lacustrine tight reservoir spaces, the intercrystalline pore, dissolution pore and fracture were newly defined. With the principle of NMR experiment, a method to identify different lacustrine tight reservoir spaces was established. Finally, according to the identification results, methods for evaluating development performance and predicting oil well productivity were proposed for lacustrine tight reservoirs. The results show that T2 spectrum has two peaks or three peaks but single peak, with average value of 8.65 ms and 657.29 ms for the corresponding relaxation time T2 of the first peak and the second one, respectively, and different peaks have the great varied continuity, indicating that the distribution characteristics of the reservoir space are complex. The radius distribution characteristics differently exist in different storage spaces in lacustrine tight reservoir of Yingxi area of Qaidam Basin, with the average peak radius of intercrystalline pore 0.05 μm, dissolution pore 7.52 μm, and fracture greater than 40 μm. The seepage capacity for lacustrine tight reservoir is proportional to the development degree of ''''dissolution pore+fracture'''', and the development degree of ''''dissolution pore + fracture'''' of intersalt reservoir is better than that of subsalt reservoir, which demonstrates that the seepage capacity of intersalt reservoir is better than that of subsalt reservoir. At the similar oil saturation, the development performance of intersalt reservoir is better than that of subsalt reservoir. By analyzing the share of ''''dissolution pore + fracture'''' and combining the value of oil saturation, the reservoir development performance can be evaluated and the oil well productivity can also be predicted in lacustrine tight reservoir.

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