Multi-Units Micro-facies Controlling Reservoir Prediction New Method in Deep Water Area

Key words: 
• deep water gravity flow sedimentary body /
• deep water sedimentary unit /
• seismic attribute /
• reversed seismic to well tie /
• NTG

Abstract: The new method was created to solve the two concealing and key problems about reservoir prediction in deep water area, which are electricity log defect in recognizing deep water gravity flow sediments(DW fan),especially claystone, and seismic data hard to be used to delineate the thin interbedded sandstone and claystone within DW fan. Firstly, according to obvious seismic reflective characteristics, put forward plane-line-point study method for DW fan. First step, based on the seismic attributes, build DW fan deposition model; second step, create reversed seismic to well tie to identify the top and bottom of DW fan on the well log section, research sedimentary micro-face, classify DW fan into five kind of sedimentary units, accurately calculate the net to gross (NTG) of five kind of units of DW fan. Then choose the appropriate seismic attributes to build their correlation with NTG, and transfer the seismic attribute map into the NTG map and sandstone thickness map with different sedimentary unit seismic attribute and NTG correlation formula.