DLH油田低渗砂岩孔隙分形定量表征方法研究

doi:10.11885/j.issn.1674-5086.2020.11.04.03

西南石油大学学报(自然科学版) ›› 2023, Vol. 45 ›› Issue (1): 105-116.DOI: 10.11885/j.issn.1674-5086.2020.11.04.03

DLH油田低渗砂岩孔隙分形定量表征方法研究

孙强^1,2, 孙志刚^1,2, 张超^3,4

1. 中国石化胜利油田分公司勘探开发研究院, 山东东营 257015;
2. 山东省非常规油气勘探开发重点实验室(筹), 山东东营 257015;
3. 非常规油气开发教育部重点实验室·中国石油大学(华东), 山东青岛 266580;
4. 中国石油大学(华东)石油工程学院, 山东青岛 266580

收稿日期:2020-11-04 发布日期:2023-02-24
通讯作者: 张超,E-mail:zhangc@upc.edu.cn
作者简介:孙强,1986年生,男,汉族,山东潍坊人,高级工程师,硕士,主要从事非常规油气田开发方面的研究工作。E-mail:sunqiang185.slyt@sinopec.com
孙志刚,1974年生,男,汉族,山东临沂人,教授级高级工程师,硕士,主要从事油水渗流机理及开发实验方面的研究工作。E-mail:sunzhigang-707.slyt@sinopec.com
张超,1988年生,男,汉族,山东聊城人,副教授,博士,主要从事非常规油藏注气提高采收率方面的研究工作。E-mail:zhangc@upc.edu.cn
基金资助:
山东省自然科学基金（ZR2020QE106）；国家科技重大专项（2017ZX05072）

A Study on Fractal Quantitative Characterization Method of Low Permeability Sandstone Pore in DLH Oilfield

SUN Qiang^1,2, SUN Zhigang^1,2, ZHANG Chao^3,4

1. Exploration and Development Research Institute, Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257015, China;
2. Shandong Key Laboratory of Unconventional Oil and Gas Exploration and Development (Preparation), Dongying, Shandong 257015, China;
3. MOE Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum, Qingdao, Shandong 266580, China;
4. School of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong 266580, China

Received:2020-11-04 Published:2023-02-24

摘要/Abstract

摘要： 针对常规表征方法难以精确表征低渗砂岩储层孔隙空间分布复杂性和不规则性的问题，提出了适用于低渗砂岩储层的分形维数计算方法，实现了低渗砂岩储层孔隙特征的定量表征。基于不同分形维数计算方法差异性的分析，优选采用MIFA方法求解低渗砂岩储层的分形维数（在2.042~2.324），相关性最佳；确定了排驱压力、平均孔喉半径、变异系数以及均值系数作为储层孔喉分布复杂程度和非均质程度的综合表征参数；基于恒速压汞分形维数的求解，发现低渗砂岩储层非均质程度呈中小孔喉大于微小孔喉，喉道分布大于孔隙分布的特点；低渗砂岩储层的分形维数与启动压力梯度和应力敏感性损害率的实验结果均存在一定的相互关系，分形维数越大，孔喉分布的非均质性越强，启动压力梯度越大且应力敏感性的损害程度也将加剧。低渗砂岩储层分形维数的计算可用于室内实验结果的定性预测和判断，也可作为油藏工程中应用相渗曲线时的重要判别标准。

关键词: 低渗砂岩, 微观孔隙结构, 分形维数, MIFA方法, 高压压汞, 恒速压汞

Abstract: In view of the difficulty of conventional characterization methods to accurately characterize the complexity and irregularity of pore space distribution in low-permeability sandstone reservoirs, a fractal dimension calculation method is proposed to realize the quantitative characterization of pore characteristics of low-permeability sandstone reservoirs. Based on the analysis of the difference between different fractal dimension calculation methods, the MIFA method is preferably used to solve the fractal dimension of low permeability sandstone reservoirs (between 2.042 and 2.324), with the best correlation. The displacement pressure, average pore throat radius, coefficient of variation, and mean coefficient are determined as the comprehensive characterization parameters of the complexity and heterogeneity of reservoir pore throat distribution. Based on the solution of the fractal dimension of mercury injection at a constant rate, it is found that the heterogeneity of low-permeability sandstone reservoirs presents the following characteristics:small and medium pore throats are larger than small pore throats, and throat distribution is larger than pore distribution. There is certain correlation between the fractal dimension of low-permeability sandstone reservoirs and the experimental results of starting pressure gradient and stress sensitivity damage rate. The larger the fractal dimension, the stronger the heterogeneity of the pore throat distribution and the larger the starting pressure gradient is needed and the damage to the stress sensitivity will increase. The calculation of the fractal dimension of low-permeability sandstone reservoirs can be used for qualitative prediction and judgment of laboratory experimental results, and also as an important criterion for the application of relative permeability curves in reservoir engineering.

Key words: low-permeability sandstone, micro-pore structure, fractal dimension, MIFA method, high pressure mercury intrusion, constant-speed mercury penetration

中图分类号:

TE348

孙强, 孙志刚, 张超. DLH油田低渗砂岩孔隙分形定量表征方法研究[J]. 西南石油大学学报(自然科学版), 2023, 45(1): 105-116.

SUN Qiang, SUN Zhigang, ZHANG Chao. A Study on Fractal Quantitative Characterization Method of Low Permeability Sandstone Pore in DLH Oilfield[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(1): 105-116.

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DLH油田低渗砂岩孔隙分形定量表征方法研究

A Study on Fractal Quantitative Characterization Method of Low Permeability Sandstone Pore in DLH Oilfield

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