SWLGS Luncheon Topics
Updated Jan. 3, 2008
Pre-stack inversion - take a good, close look at your rocks from miles away
Gary Perry, VP Dallas Reservoir Services, Geotrace
Data you already own could provide you with more information than you ever imagined. Using pre-stack migrated CMP gathers and the proper well log suites on just a few wells, rock properties can be closely estimated for each location in the 3D volume. Both P- and S-wave velocity and density and, from those basic properties, bulk modulus, Poisson’s ratio, Lame’s modulus and Young’s modulus are inverted from the pre-stack data. When one knows (within reason) all these things the lithology and fluid can both also be closely estimated. So before a new well is drilled potential locations can be rated by reservoir rock quality, thickness and saturation. These days when it is especially important to get the most product into the pipeline as fast as possible it is essential to be able to know the best places to drill. Case histories in southeast Texas and Breton Sound, Louisiana will be shown.
Gary Perry has been in the industry since 1974 and studied Geology with emphasis on Geophysics at the University of Texas during his early career. He is currently Vice President, Reservoir Services for Geotrace in Dallas and has been with the company for over 21 years. Gary was previously with Geo-Search Corporation from 1974 to 1986 where he performed basinal velocity studies in several onshore U.S. basins before going into seismic processing.