基于岩电实验的储层岩石毛管压力与电阻率相关性分析  

Correlation analysis between the capillary pressure and resistivity of the reservoir rock based on the rock-electric test

作　　者：侯玢池 崔鹏兴 梁卫卫 王小锋 王起琮 HOU Binchi;CUI Pengxing;LIANG Weiwei;WANG Xiaofeng;WANG Qicong(Research Institute of Shanxi Yanchang Petroleum(Group)Co Ltd,Xi'an 710065,China;Shanxi Ultra-low-permeability Oil and Gas Field Exploration and Development Engineering Technology Research Center 9 Xi'an 710065,China;School of Energy Resources,China University of Geosciences,Beijing 100083,China;School of Earth Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China)

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710065 [2]陕西省特低渗透油气田勘探与开发工程技术研究中心,陕西西安710065 [3]中国地质大学(北京)能源学院,北京100083 [4]西安石油大学地球科学与工程学院,陕西西安710065

出　　处：《大庆石油地质与开发》2022年第2期75-82,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“塔里木深层—超深层白云岩成岩作用与储层表征”(2017ZX05005002-004);国家自然科学基金重点项目“提高低渗透油气田采收率的气润湿反转理论和方法”(51034004)。

摘　　要：毛管压力是影响多孔介质中多相流体的重要参数之一,通常采用实验方法测定,但难度大、耗费时间,且准确性难以保证。毛管压力和电阻率指数均为岩石多孔介质中含水饱和度的函数,通过毛管压力与电阻率指数之间函数关系的推导,利用电阻率指数数据直接计算出毛管压力。为了验证两者之间的幂函数模型(Li模型),同时基于更多岩石样品数进行数学模型精确度分析,对X油藏中2口井共16块岩心进行毛管压力和电阻率联测实验研究。结果表明:现有的幂函数模型能够较好地关联毛管压力与电阻率指数的实验数据,模型中特征参数β在双对数坐标下随岩心渗透率增大而减小。通过3个数据拟合公式计算得到了3组β值,并对比分析了计算β值与实验值之间的标准偏差大小及其原因。Capillary pressure is one of the significant parameters affecting the multi-phase fluids in the porous media. It is usually measured by the experimental methods, however, it is difficult and time-consuming, and its accuracy is difficult to be guaranteed. The capillary pressure and resistivity index are both the functions of the water saturation in the rock porous media. Through deducing the relationship between the capillary pressure and resistivity index, the capillary pressure can be directed calculated from the resistivity index. In order to confirm the existing power function model(Li model)between the above two, the precision analysis is conducted for the mathematical model on the basis of more rock samples, and the test study for simultaneously measuring the capillary pressure and resistivity index is engaged in 16 core samples from 2 wells in X oil reservoir. The results demonstrate that the existing power model can better correlate the capillary pressure and tested resistivity index, and the characteristic parameter β in the model decreased with the increase of the core permeability in double logarithmic coordinates. Through 3 data fitting formulas, 3 groups of Value β are obtained, and the standard deviations between the calculated Value β and the experimental value and their reasons are compared and analyzed.

关 键 词：毛管压力 电阻率 实验测定 数学模型 

分 类 号：TE122.2[石油与天然气工程—油气勘探]