Wheeler domain section sand body carving method based on three-dimensional earthquake

Abstract

The invention discloses a wheeler domain section sand body carving method based on a three-dimensional earthquake.The method comprises the following steps of determining a sequence top-bottom interface in combination with well shaking, calculating a seismic event inclination angle guiding body, tracking chronological strata according to the result whether inclination angle guiding mutates or not, and arranging chronological strata according to the sedimentation sequence to representing relative geological time, wherein parameters for tracking the chronological strata are of data drive, all the strata are continuous, and the maximum iteration is twice; breaking mutational sites, conducting iteration ten times, and establishing a three dimensional chronological stratum layer body; leveling all single layers of the layer body, and converting all the single layers into a Wheeler domain.Through Wheeler domain sections, the horizontal distribution scope of a sand body can be reflected, space carving is conducted on the sand body, through Wheeler domain seismic sections, horizontal distribution of the seismic attribute inside the sand body can be further reflected, and distribution characteristics of the sand body are researched.By means of the method, accuracy for identifying an alluvial fan sand body ad a fan-delta sand body can be improved, and the well drilling success rate is raised.

Description

technical field [0001] The invention belongs to the technical field of sand body carving, and in particular relates to a wheeler domain slice sand body carving method based on three-dimensional seismic. Background technique [0002] The principle of identification of alluvial fan sand bodies and fan delta sand bodies is based on the fact that the density and velocity of the sand bodies are significantly different from those of the surrounding mudstone, so that the sand bodies of each period have certain characteristics reflected in the seismic data. The identification of sand bodies by drilling and seismic attribute analysis methods is highly dependent on drilling data. In areas far away from the well, the error is large, and the farther away from the well, the greater the error. The drilling success rate is only 60-70%. The drilling success rate of 30-40% needs to be improved. [0003] For reservoirs with alluvial fans and fan deltas as reservoirs, high-efficiency wells ar...

AI Technical Summary

Problems solved by technology

At present, there is still a lack of effective means to study sand bodies using seismic data for oil reservoirs with large lateral changes in lithology and strong reservoir heterogeneity, but high production in the main channel.

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