基于有限元的致密砂岩储层电阻率特性模拟

doi:10.7623/syxb201606009

石油学报 ›› 2016, Vol. 37 ›› Issue (6): 787-795.DOI: 10.7623/syxb201606009

基于有限元的致密砂岩储层电阻率特性模拟

李潮流¹, 胡法龙¹, 侯雨庭², 李霞¹, 刘学锋³, 李长喜¹

1. 中国石油勘探开发研究院北京 100083;
2. 中国石油长庆油田公司陕西西安 710018;
3. 中国石油大学理学院山东青岛 266580

收稿日期:2016-01-22 修回日期:2016-05-05 出版日期:2016-06-25 发布日期:2016-06-30
通讯作者: 李潮流,男,1973年9月生,1996年获大庆石油学院学士学位,2007年获中国石油勘探开发研究院博士学位,现为中国石油勘探开发研究院高级工程师,主要从事碎屑岩储层岩石物理与测井处理解释方法研究。Email:leechl@petrochina.com.cn
作者简介:李潮流,男,1973年9月生,1996年获大庆石油学院学士学位,2007年获中国石油勘探开发研究院博士学位,现为中国石油勘探开发研究院高级工程师,主要从事碎屑岩储层岩石物理与测井处理解释方法研究。Email:leechl@petrochina.com.cn
基金资助:
国家重大科技专项(2011ZX05020-008)和中国石油天然气集团公司测井基础研究项目(2014A-3910)资助。

Simulation of electrical resistivity characteristics of tight sands reservoir by FEM

Li Chaoliu¹, Hu Falong¹, Hou Yuting², Li Xia¹, Liu Xuefeng³, Li Changxi¹

1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
2. PetroChina Changqing Oilfield Company, Shaanxi Xi'an 710018, China;
3. College of Science, China University of Petroleum, Shandong Qingdao 266580, China

Received:2016-01-22 Revised:2016-05-05 Online:2016-06-25 Published:2016-06-30

摘要/Abstract

摘要：

CT扫描和数值模拟技术已广泛应用于电阻率等岩石物理参数的模拟,但在致密砂岩储层电阻率特性模拟方面,该方法的适用性存在局限,主要原因在于分辨率的限制和过于简单的孔隙分割方法。在分析各种孔隙发育特征的基础上,通过引入MAPS和QemScan等高精度配套实验确定了致密砂岩的矿物组成、不同矿物的孔隙分布特征和图像特征,将微米图像的每个像素点作为具有一定体积和一定孔隙度的储层单元,从而构建基于1 in(25 mm)柱塞样品微米CT图像的高分辨率虚拟三维孔隙格架。采用有限元法对全尺寸的孔隙格架开展大型数值模拟计算,在高含水区间模拟结果与驱替实验结果基本一致,但在致密砂岩常常发育的低含水饱和度区间内,数值模拟结果揭示RI-S_w曲线呈现弯曲现象,更符合指数变化规律,据此计算的含油饱和度结果也得到了密闭取心资料的验证,证明了该方法研究思路正确、研究结果实用。

关键词: 致密砂岩, 电阻率, 数值模拟, 岩石物理, 鄂尔多斯盆地

Abstract:

CT scanning and numerical simulation technologies have been widely used in the simulation of rock physical parameters, such as electrical resistivity. However, this method has some limitations in simulating the electrical resistivity characteristics of tight sandstone reservoirs. The main reason lies in the resolution limitation and excessively simple pore segmentation method. Based on analyzing the development characteristics of various pores, the mineral compositions of tight sandstones, as well as pore distribution and image characteristics of various minerals are determined using MAPS, QemScan and other high-precision supporting experiments. Each pixel of micron image is taken as a reservoir unit with certain volume and porosity, so as to establish the 3D high-resolution pore framework based on micron CT image of 1-inch core plug sample. Large-scale numerical simulation calculation of the full-size pore framework is performed using finite element method. In the highly water-saturated sections, the simulation results are basically consistent with displacement experiment results. However, in the lowly water-saturated sections commonly with the development of tight sandstones, the numerical simulation results reveal the bending phenomenon in RI-S_w curve, more in line with exponential function. Accordingly, the calculated oil-saturation results are also validated by sealed coring data, demonstrating the correct research idea and practical research result of this method.

Key words: tight sandstone, electrical resistivity, numerical simulation, petrophysics, Ordos Basin

中图分类号:

TE122.2

李潮流, 胡法龙, 侯雨庭, 李霞, 刘学锋, 李长喜. 基于有限元的致密砂岩储层电阻率特性模拟[J]. 石油学报, 2016, 37(6): 787-795.

Li Chaoliu, Hu Falong, Hou Yuting, Li Xia, Liu Xuefeng, Li Changxi. Simulation of electrical resistivity characteristics of tight sands reservoir by FEM[J]. Acta Petrolei Sinica, 2016, 37(6): 787-795.

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基于有限元的致密砂岩储层电阻率特性模拟

Simulation of electrical resistivity characteristics of tight sands reservoir by FEM

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