Method of predicting spatial distribution of channel sand by seismic attributes

Abstract

The invention discloses a method of predicting spatial distribution of channel sand by seismic attributes, which belongs to the field of oil and gas geophysical prospecting engineering. The method comprises steps: logging data and seismic data in a target reservoir area are acquired, well seismic demarcation is carried out and a target layer is determined; according to the seismic data of the target layer, a cubic spline encrypted sampling method is used to obtain a high-density seismic data volume; and according to the high-density seismic data volume and the logging data, a seismic sensitiveattribute volume and seismic attribute slices are obtained, the zero point position of the seismic attributes is determined, and the quantitative relationship between the seismic attributes and the channel sand body position and the thickness is further determined. The prediction on the spatial distribution of the channel sand by the seismic attributes changes to more accurate quantitative analysis from qualitative description, the error range of a seismic attribute sand thickness prediction result demarcated by the actual logging data is reduced, and the scope of using the seismic attributesto predict the distribution of thin-layer channel sand and carry out quantitative evaluation is widened.

Description

technical field [0001] The invention belongs to the field of oil and gas geophysical prospecting engineering, in particular to a method for predicting the spatial distribution of channel sand by seismic attributes. Background technique [0002] In recent years, with the deepening of the application of seismic data, seismic sedimentology, which takes seismic attribute slice interpretation as its technical connotation, has attracted widespread attention from seismic data interpreters. Its comprehensive geological understanding and logging information can maximize the mining of seismic data. Potential geological information, and then predict and analyze the depositional process and depositional insider. In the exploration and development of fluvial sedimentary lithologic reservoirs, the spatial distribution description and quantitative evaluation of channel sand bodies are very important, especially in the current process of oil and gas exploration from traditional structural r...

AI Technical Summary

Problems solved by technology

[0005] Although existing methods for the spatial distribution of channel sands are widely used in actual production, their physical significance and reliability are often questioned by geologists and geophysicists due to the subjectivity of qualitative description and analysis. Accurately identify and evaluate the distribution of high porosity and permeability areas in channel sand reservoirs and predict the spatial location and physical parameter distribution of high-quality reservoir sand bodies

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