鄂尔多斯盆地高自然伽马储层识别研究

Identification of High Gamma Ray Reservoir in Ordos Basin

对鄂尔多斯盆地存在的高自然伽马砂岩储层,仅用自然伽马测井资料难以正确识别并计算其泥质含量。分析了这类储层的特征和矿物成份。针对其成因和测井曲线特征,利用地层元素俘获谱测井、中子-密度交会和Geoframe平台综合反演等方法,能有效识别这类高自然伽马砂岩储层并求取其泥质含量。

For some sandstone reservoirs with high natural gamma ray existed in Ordos Basin, it is difficult to be correctly identified and to calculate its shale content with gamma ray log only. The characteristics of this kind of reservoirs and their mineral components are analyzed. Based on the forming causes and the logging characteristics of the reservoir, the applications of elemental capture spectral log, density-neutron cross plot, and synthesized inversion on Geoframe etc. can effectively identify the sandstone reservoirs with high GR and can correctly calculate their shale contents.