Analysis and evaluation of interwell seismic logging techniques for reservoir characterization. [Quarterly report], July 1--September 30, 1992

The objective of this three-year research program is to investigate interwell seismic logging techniques for indirectly interpreting oil and gas reservoir geology and pore fluid permeability. This work involves a balanced study of advanced theoretical and numerical modeling of seismic waves transmitted between pairs of reservoir wells combined with experimental data acquisition and processing of measurements at controlled sites as well as in full-scale reservoirs. This reservoir probing concept is aimed at demonstrating unprecedented high-resolution measurements and detailed interpretation of heterogeneous hydrocarbon-bearing formations. Progress reports are presented by Task 3 conduct full-scale experimental field test and Task 4 data processing studies. For Task 3, interwell seismic experiments were conducted in the month of September at the University of Oklahoma Gypsy test site which is located in Pawnee County, Oklahoma. During the field test a full suite of interwell seismic data were acquired and will be used to extract rock porosity and permeability. In particular, interwell seismic experiments were conducted using two borehole hydrophone arrays (streamers) consisting of twelve detector channels (i.e., simultaneous source-to-detector measurements were made in two boreholes pairs having different separation distances) for source-independent seismic attenuation and dispersion studies.