Abstract:

Three reservoir prediction approaches are proposed based on reservoir characteristics,reservoir velocity,and forward modeling analyses in northern Kendong: 1) direct 3-D tracing of the reservoirs on amplitude data volume can be performed with visualized interpretation software since the isolated river channel sands feature in seismic reflectance signatures of high amplitude and lenticular shape;2) characteristic curve inversion can be an option in the study of spatial distribution of reservoirs due to the facts that continuous crests and troughs of high amplitude indicate a successive sedimentation of sandstone and similar velocities of sandstone and mudstone render an ineffective distinction of sandbody through impedance data;and 3) wave impedance inversion can be used in prediction of the spatial distribution of gas reservoirs because the typical gas reservoirs in the study area show low impedance and a velocity far lower than that of mudstone.An integrated application of the three approaches is of great significance in improving the accuracy of reservoir prediction and performing lateral prediction of reservoirs in the study area.

Key words: forward model, seismic wave impedance inversion, reservoir characteristic curve inversion, seismic attribute, reservoir prediction, Jiyang depression