EVALUATING MARINE GAS-HYDRATE SYSTEMS PART II: ROCK-PHYSICS JOINT INVERSION OF ELECTRICAL RESISTIVITY AND SEISMIC VELOCITIES

摘要

Sava, D., Hardage, B.A., DeAngelo, M. and Murray, P., 2011. Evaluating marine gas-hydrate systems. Part II: Rock-physics joint inversion of electrical resistivity and seismic velocities. Journal of Seismic Exploration, 20: 105-118. The methodology for joint inversion presented in this paper uses a Bayesian approach, and combines rock-physics theories and empirical relations with stochastic simulations that were presented in Part I of this 2-paper series. We show examples of estimating gas-hydrate concentration and calculating the uncertainty associated with these estimates using electrical resistivity logs and 4C OBC seismic data across the Green Canyon area of the Gulf of Mexico. At calibration wells, we estimate hydrate concentration by jointly inverting electrical resistivity logs and seismic interval velocities.