Patent ID: 9739902
Date: 2017-08-22
CPC Classifications: G01V

Claim:
1. A method for mapping remaining hydrocarbon resources in a subsurface reservoir, comprising: (a) obtaining a map of four dimensional (4D) seismic amplitude difference over a time period based on a survey of the subsurface reservoir, wherein the map of 4D seismic amplitude difference represents changes in seismic response as a result of production of reservoir fluids from the subsurface reservoir over the time period, and wherein the map of 4D seismic amplitude difference is based on seismic data from seismic waves generated by one or more sources of energy and measured by one or more receivers; (b) generating, with a processor, expected cross plot trends to correlate the map of 4D seismic amplitude difference versus oil cut in the subsurface reservoir based on one or more non-water saturation effects detected over the time period by one or more wellbore surveillance direct measurements from at least one sensor of various reservoir properties at one or more locations in the subsurface reservoir; (c) correcting, with a processor, the map of 4D seismic amplitude difference based, at least in part, on the expected cross plot trends to generate a corrected 4D seismic amplitude map; and (d) using the corrected 4D seismic amplitude difference map to generate, with a processor, a map representative of remaining hydrocarbon resources in the subsurface reservoir, wherein the map representative of remaining hydrocarbon resources in the subsurface reservoir will allow exploration and development of the subsurface reservoir.