陆相页岩储集层含水饱和度测井计算方法——以川东南复兴区块凉高山组为例

doi:10.7657/XJPG20240315

摘要/Abstract

摘要：

陆相页岩储集层具有低孔特低渗特征，其黏土矿物含量高，岩石组成变化快，地层非均质性强，利用传统阿尔奇公式及常规数理统计模型计算的含水饱和度误差大。为提高陆相页岩储集层含水饱和度计算精度，以川东南复兴区块下侏罗统凉高山组页岩为例，分析了现有含水饱和度测井计算方法的局限性，阐述了利用阵列声波测井中的纵横波时差与测井密度组合重构的复合波阻抗计算含水饱和度的可行性。在此基础上，提出了陆相页岩储集层含水饱和度计算方法。该方法考虑了岩石矿物的影响，有效避开了电法测井和非电法测井的局限性，提高了适用性。在川东南复兴区块多口井凉高山组页岩储集层的应用效果好，计算得到的含水饱和度与岩心分析含水饱和度较吻合，绝对误差为1.3%~2.2%，满足测井评价要求。

关键词: 川东南, 复兴区块, 凉高山组, 陆相页岩, 含水饱和度, 复合波阻抗, 阵列声波测井

Abstract:

Continental shale reservoirs are characterized by low porosity, ultra-low permeability, high clay mineral content, rapid mineral composition variation, and strong formation heterogeneity. Therefore, the water saturation calculated with Archie formula or conventional mathematical statistical models often introduces large errors. To improve the calculation accuracy of water saturation in continental shale reservoirs, taking the shale from Lower Jurassic Lianggaoshan formation in the Fuxing block of southeastern Sichuan basin as an example, the limitations of existing methods for calculating water saturation were analyzed, and the feasibility of applying the composite wave impedance reconstructed from the combination of P wave and S wave in array acoustic logging and logging density to calculate water saturation was demonstrated. Based on this analysis, a method for calculating water saturation in continental shale reservoirs was proposed. This method considers the influence of rock minerals and effectively avoids the limitations of electrical logging and non-electrical logging, and finally improving applicability. The application of this method has yielded favorable results in multiple wells in the shale reservoirs of Lianggaoshan formation, southeastern Sichuan basin, with calculated water saturation closely matching those from core analysis, and absolute errors ranging from 1.3% to 2.2%, meeting the requirements for well logging evaluation.

Key words: southeastern Sichuan basin, Fuxing block, Lianggaoshan formation, continental shale, water saturation, composite wave impedance, array acoustic logging

中图分类号:

TE112.23

程丽, 严伟, 李娜. 陆相页岩储集层含水饱和度测井计算方法——以川东南复兴区块凉高山组为例[J]. 新疆石油地质, 2024, 45(3): 371-377.

CHENG Li, YAN Wei, LI Na. A Logging-Based Method for Calculating Water Saturation in Continental Shale Reservoirs: A Case Study of Lianggaoshan Formation in Fuxing Block, Southeastern Sichuan Basin[J]. Xinjiang Petroleum Geology, 2024, 45(3): 371-377.

图/表 7

图1

图2

图3

表1

TY1井弹性波阻抗与含水饱和度的相关性"

弹性波阻抗参数	关系式	相关系数
纵波阻抗 $Z 1 = v p ρ$	$Z 1 = 0.003 S w - 60.6$	0.85
横波阻抗 $Z 2 = v s ρ$	$Z 2 = 0.009 ? 25 S w - 52.5$	0.84
平均波阻抗 $Z 3 = (v s + v p) ρ$	$Z 3 = 0.009 ? 5 S w - 55$	0.86
复合波阻抗 $Z 4 = (v s + v p) ρ v p$	$Z 4 = 0.001 ? 25 S w - 1.5$	0.95

表1

图4

图5

表2

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井名	本文方法计算平均含水饱和度/%	岩心分析平均含水饱和度/%	绝对误差/%	相对误差/%	相关系数
XY3井	51.3	49.1	2.2	4.5	0.84
XY4井	52.5	51.2	1.3	2.5	0.87
XY6井	58.6	56.9	1.7	3.0	0.86
XY7井	59.1	57.7	1.4	2.4	0.89