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Abstract:The "Seismic Evaluation of Hydrocarbon Saturation in Deep-Water Reservoirs" (Grant/Cooperative Agreement DE-FC26-02NT15342) began September 1, 2002. During this second quarter:-A Direct Hydrocarbon Indicator (DHI) symposium was held at UH -Current DHI methods were presented and forecasts made on future techniques.-Dr. Han moved his laboratory from HARC to the University of Houston.-Subcontracts were re-initiated with UH and TAMU.-Theoretical and numerical modeling work began at TAMU -Geophysical Development Corp. agreed to provide petrophysical data.-Negotiations were begun with Veritas GDC to obtain limited seismic data.-Software licensing and training schedules were arranged with Paradigm.-Data selection and acquisition continues.The broad industry symposium on Direct Hydrocarbon Indicators was held at the University of Houston as part of this project. This meeting was well attended and well received. A large amount of information was presented, not only on application of the current state of the art, but also on expected future trends.Although acquisition of appropriate seismic data was expected to be a significant problem, progress has been made. A 3-D seismic data set from the shelf has been installed at Texas A&M University and analysis begun. Veritas GDC has expressed a willingness to provide data in the deep Gulf of Mexico. Data may also be available from TGS.Agreement DE-FC26-02NT15342, Seismic Evaluation of Hydrocarbon Saturation 4Contents:

Knowledge of mechanical properties of subsurface at elevated temperature is crucial to understand a range of processes in the earth’s crust and in building geomechanical models to assist in operating geothermal systems, nuclear waste repository, CO2 sequestration and hydrocarbon extraction. Although there exists sufficient literature reporting measurement of static mechanical properties on a range of rock types at elevated temperature, reported values for ultrasonic velocities are extremely limited. This in turn presents a challenge for the dynamic-to-static conversion of mechanical properties, a pivotal step in building geomechanical model. This paper presents the results of a laboratory study utilizing Castlegate and Berea sandstone and mudstone samples from a producing US reservoir at 75C. A decrease in both P and S wave velocity with temperature is observed in a Berea sample. A decrease in static Young’s modulus is observed in mudstone samples from two clay-rich reservoir intervals with one of the reservoir intervals demonstrating significant static and dynamic anisotropy. Additionally, the samples from both intervals mimicked the response of Castlegate for dynamic mechanical properties under constant hydrostatic stress. This study is intended to provide better representative inputs for improving the accuracy of subsurface characterization and geomechanical models for aforementioned applications.