Predicting saturation of gas hydrates using pre-stack seismic data, Gulf of Mexico

Gas hydrate resource potential in the Terrebonne Basin, Northern Gulf of Mexico

“…A single industry well drilled in 2001 in WR313 (OCS-G 18683 #001; hereafter WR313-1) is located high on the eastern margin of the basin; however, the LWD data from the shallow section of that log was of poor quality. The primary gas hydrate targets occurred further to west toward the basin axis, and were supported by strong seismic reflection signatures indicative of gas hydrate occurrence Shelander et al, 2010). The JIP drilled two wells (the WR313-G and WR313-H) at the site that fully penetrated three of these prospective target intervals, two of which were drilled in areas interpreted to be gas hydrate bearing.…”

“…Three of these interpreted gas hydrate reservoirs were tested with the JIP WR313-G and WR313-H wells. Additional background on the pre-drill interpretation for the sites can be found in Shelander et al, (2010: seismic inversion results), McConnell et al (2012 shallow hazards analysis); site selection and exploration model (Hutchinson et al, 2010;Boswell et al, 2012a). Initial JIP Leg II results publications for WR313, prepared shortly after the 2009 drilling program, included petroleum system analysis and drilling results Shedd et al, 2010b), and LWD operations and results (Cook et al, 2009).…”

Gas hydrate saturation from acoustic impedance and resistivity logs in the Shenhu area, South China Sea

“…Gas hydrate saturation from seismic profile was calculated from waterfilled porosity using Archie's parameters, the resistivity of the fully water-saturated formation and the pore water resistivity. Elastic impedance inversion of multichannel seismic data were used to estimate the elastic properties of sediments containing gas hydrate from angle dependent P-wave reflections (Lu and McMechan, 2004) and pre-stack seismic data (Shelander et al, 2010). The acoustic impedance inversion of 3D seismic data, log to seismic correction and seismic attribute analyses were combined to delineate gas hydrate zone in the Mallik site, Mackenzie Delta, Northwest Territories, Canada (Riedel et al, 2009).…”

Challenges, Uncertainties, and Issues Facing Gas Production From Gas-Hydrate Deposits

“…The group evaluated these sites through integrated geological and geophysical analyses and ultimately developed the site descriptions and prioritizations that were implemented in JIP Leg II. This analysis also included the use of advanced seismic inversion techniques to estimate GH saturations at the drill sites being considered Shelander et al, 2010).…”