Method for quantitative calculation of thickness of thin reservoir layer

Abstract

The invention provides a method for quantitative calculation of thickness of a thin reservoir layer. The method comprises the steps of carrying out three-dimensional multiple coverage data acquisition on the earth's surface to obtain seismic data; carrying out "three-high" processing on the seismic data to obtain three-dimensional post-stack seismic data; conducting logging-seismic calibration by use of logging data, and making clear of the position of a target reservoir layer; carrying out three-dimensional seismic horizon interpretation on the target layer to obtain a time window extraction guide layer; under the guidance of the time window extraction guide layer, giving an appropriate time window according to estimated thickness of the target reservoir layer and seismic data dominant frequency; extracting relative spectral peak frequency increment seismic attributes, and calculating two-way travel time thickness of the target thin reservoir layer; and with P-wave velocity data, converting the time thickness of the target thin reservoir layer into strata thickness. Compared with a current quantitative prediction method for a thin reservoir layer, the method is not subject to an absolute reflection coefficient of top and bottom sides of the thin reservoir layer and does not rely on well data, and the prediction accuracy is high.

Description

technical field [0001] The invention relates to a seismic exploration method in applied geophysics, in particular to the technical field of exploration of thin reservoirs, in particular to a method for quantitatively calculating the thickness of thin reservoirs by using relative spectral peak frequency increments. Background technique [0002] The seismic prospecting method in applied geophysics refers to artificially stimulating seismic waves on the surface. When propagating underground, the seismic waves will be reflected and transmitted when encountering a rock layer interface with different medium properties. Earthquake records. The features on the seismic records are related to the nature and structure of the underground rock formations. By processing and interpreting the seismic records, the nature and shape of the underground rock formations can be inferred. Seismic exploration plays an important role in oil and gas exploration because it is superior to other geophys...

AI Technical Summary

Problems solved by technology

To sum up, the current thin reservoir quantitative prediction methods either need to know the absolute size of the reflection coefficient of the top and bottom of the thin reservoir in advance, or have strict requirements on the acquisition and processing of seismic data, or rely strictly on drilling, so that These methods are very limited in practical application

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