鄂尔多斯盆地延长组页岩含气量测井评价

Logging Evaluation of Yanchang Shale Gas Content in Ordos Basin

以鄂尔多斯盆地甘泉地区三叠系延长组泥页岩为研究对象,通过现场含气量解析及等温吸附实验分别对页岩含气量及页岩吸附能力进行研究。根据TOC、实测含气量、孔隙度及含气饱和度等实验分析数据与测井曲线进行拟合,建立了页岩吸附气含量和游离气含量解释模型。利用改进的ΔlgR法对研究区内延长组页岩TOC进行了计算,并利用多参数法及阿尔奇公式分别预测区内页岩孔隙度和含气饱和度。根据解释模型,对吸附气和游离气含气量分别进行了测井解释。测井解释结果与实测数据相关性较好,证明了解释方法在研究区具有较强的适用性。

Field gas desorption and gas isothermal adsorption tests are used to research the gas content and gas adsorption capacity of Triassic Yanchang shale in Ganquan of Ordos Basin. The interpretation models of free gas content and adsorbed gas content in shale are established by the fitting between logging curves and test data of TOC,measured gas content,porosity,gas saturation,etc. An improved ΔlgR method is used to calculate the TOC of Yanchang shale,multi-parameter method and Archie Formula are used to forecast the shale porosity and gas saturation. The free gas and adsorbed contents are interpreted separately based on the interpretation models. Well logging interpretation is well correlated with measured data,which proves its applicability in the research area.