页岩气储层微观孔隙结构连续定量表征与含气量评价

项目名称： 页岩气储层微观孔隙结构连续定量表征与含气量评价

项目编号： No.41504108

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 天文学、地球科学

项目作者： 王亮

作者单位： 西南石油大学

项目金额： 20万元

中文摘要： 项目针对页岩气储层微观孔隙结构连续定量表征与含气量评价中存在的问题，选取四川盆地页岩气储层为研究对象，通过配套岩石物理实验与数值模拟相结合的方法，开展研究。首先，基于配套岩石物理实验，明确页岩气储层的岩性、润湿性、孔隙结构等特征，分析这些因素对核磁T2谱、甲烷吸附、导电性的影响。其次，建立三维数字岩心，利用随机游走理论模拟储层核磁响应；将数值模拟结果与实验结果相结合，明确储层的核磁响应机理。然后，基于核磁响应机理，建立核磁T2谱形态校正方法以及孔径分布曲线与核磁T2谱之间的转换模型；根据转换模型，利用核磁测井曲线连续定量表征储层微观孔隙结构。最后，在明确甲烷吸附与岩石导电机理的基础上，建立或优化吸附气与游离气含量计算模型，利用电阻率测井曲线计算储层含气量。项目成果可为页岩气储层有效性评价与资源潜力评估提供技术支撑，对提高勘探效率，降低开发风险起到重要作用。

中文关键词： 页岩气储层；孔隙结构；核磁共振；饱和度；吸附机理

英文摘要： Taking the shale gas reservoir in Sichuan basin as the research target, this project is aim at solving problems in the continuous quantitative characterization of micro-pore structure and evaluation of gas content in shale gas reservoir by combination of laboratory experiments and numerical simulation. Firstly, a series of laboratory experimental study of cores is conducted to more completely understand the characteristics of lithology, wettability and pore structure, and their influences on nuclear magnetic resonance (NMR) T2 spectrum, adsorption of methane and conductivity of rock. Secondly, according to the three-dimensional digital cores of shale gas reservoir, the NMR responses of reservoir is simulated by random walk theory, and the mechanism of NMR response are verified by combining simulation results and experimental results. In addition, based on the mechanism of NMR response, the method of correcting shape of NMR T2 spectrum and model of transforming the NMR T2 spectrum to the pore size distribution curve are established. With the help of the transformation model, the NMR logs are used to characterize the micro-pore structure of shale gas reservoir continuously and quantitatively. Finally，according to the mechanisms of methane adsorption and rock conductivity, models of calculating contents of adsorbed gas and free gas are built or optimized, and then the gas content of shale gas reservoir is calculated by resistivity logs. The results of this project can provide technical supports in evaluating the effectiveness of shale gas reservoirs and assessing the resources potential, which plays an important role in improving the efficiency of exploration and reducing the risk of development.

英文关键词： Shale gas reservoir;Pore structure;Nuclear magnetic resonance;Saturation;Adsorption mechanism