ime-to-depth conversion and seismic velocity stimation using time-migration velocity
نویسندگان
چکیده
The objective was to build an efficient algorithm 1 to estimate seismic velocity from time-migration velocity, and 2 to convert time-migrated images to depth. We established theoretical relations between the time-migration velocity and seismic velocity in two and three dimensions using paraxial ray-tracing theory. The relation in two dimensions implies that the conventional Dix velocity is the ratio of the interval seismic velocity and the geometric spreading of image rays. We formulated an inverse problem of finding seismic velocity from the Dix velocity and developed a numerical procedure for solving it. The procedure consists of two steps: 1 computation of the geometric spreading of image rays and the true seismic velocity in time-domain coordinates from the Dix velocity; 2 conversion of the true seismic velocity from the time domain to the depth domain and computation of the transition matrices from time-domain coordinates to
منابع مشابه
Seismic velocity estimation from time migration
We address the problem of estimating seismic velocities inside the Earth which is necessary for obtaining seismic images in regular Cartesian coordinates. The main goals are to develop algorithms to convert time-migration velocities to true seismic velocities, and to convert time-migrated images to depth images in regular Cartesian coordinates. Our main results are three-fold. First, we establi...
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