The Application of Seismic Attributes Analysis to Lithologic Gas Reservoir Description

The He8 sandstone lithologic gas reservoir in Permian system of Ordos Basin can be described by stronger heterogeneity,small number of wells,larger well spaces and more difficult reservoir prediction during earlier stage development.Three optimal attributes-seismic reflection waveform,variance parameter of seismic wave velocity and absorption coefficients of seismic wavelet have been sought out according to seismic attributes analysis results integrating well data by using of geologic statistics method.These attributes are sensitive to sandstone thickness,physical properties and gas bearing.The classifying characteristics of above three attributes have been used in the thickness prediction and description of gas reservoir distribution of He8 sandstone.The resulting two types gas bearing zones(type Ⅰand Ⅱ) have been confirmed as the next appraisal areas.The application of seismic attributes(analysis) provided an important proof in evaluation deployment and making development plan for heterogeneous lithologic gas reservoir.