致密砂岩微观孔隙非均质性定量表征及储层意义——以鄂尔多斯盆地X地区山西组为例

Quantitative characterization of microscopic pore heterogeneity in tight sandstones and its reservoir significance: A case study of the Shanxi Formation in X area, Ordos Basin

卢晨刚 张遂安 毛潇潇 赵迪斐

Lu Chengang Zhang Suian Mao Xiaoxiao Zhao Difei

中国石油大学(北京) 煤层气研究中心, 北京 102200 2. 中国石油大学(北京) 石油工程学院, 北京 102200 3. 中国石油大学(北京) 地球科学学院, 北京 102200 4. 中国矿业大学 资源与地球科学学院, 江苏 徐州 221116 5. 煤层气资源与成藏过程教育部重点实验室, 江苏 徐州 221008

Coalbed Methane Research Center, China University of Petroleum, Beijing 102200, China 2. College of Petroleum Engineering, China University of Petroleum, Beijing 102200,China 3. College of Geosciences, China University of Petroleum, Beijing 102200,China 4. School of Resources and Earth Science, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China 5. Key Laboratory of CBM Resource and Reservoir-generating Process, China Ministry of Education, Xuzhou, Jiangsu 221008, China

以鄂尔多斯盆地东部X地区山西组致密砂岩储层为例，采用Matlab编程，提出铸体薄片图像面孔率提取的新方法，基于面孔率提出非均质系数U定量表征微观孔隙非均质性，并讨论非均质系数U和储层物性关系及微观孔隙非均质性的储层意义。结果表明，X地区致密砂岩储层微观非均质性强烈，微观孔隙分布十分不均匀；非均质系数U与孔隙度和渗透率均为负相关关系，非均质系数U越大，储层非均质性越强，储层物性越差，反之储层物性越好；致密砂岩储层微观非均质性控制着孔隙（储集空间和渗流空间）的微观发育特征，致密砂岩储层非均质系数定量评价有利于指导后期开发、开采中优质层位的圈定。

This paper presents a new method to extract the face rate of casting a thin section image of tight sandstones from the Shanxi Formation in the eastern Ordos Basin based on Matlab software programming. A heterogeneity coefficient U is proposed according to face rate, which quantitatively characterizes microscopic pore heterogeneity. The reser-voir significance of the heterogeneity coefficient U and the relationship between reservoir physical properties and microscopic pore heterogeneity were discussed. The results show that the micro-heterogeneity of the tight sandstone reservoirs in X area is very strong and the micro-pore distribution is very heterogeneous. A larger heterogeneity coefficient U and a stronger reservoir heterogeneity is associated with poorer reservoir physical properties, and vice versa.The microscopic heterogeneity of tight sandstone reservoirs influenced the microscopic development characteristics of pore space (reservoir space and permeability). The quantitative evaluation of the heterogeneity coefficient of tight sandstone reservoirs can guide the selection of high-quality strata for production.

国家“十三五”科技重大专项（2016ZX05066）和煤层气资源与成藏过程教育部重点实验室（中国矿业大学）开放基金项目（2015-007）资助。

https://doi.org/10.11781/sysydz201704556