Thin interbed analytical method of characteristic slice

Abstract

Disclosed in the invention is a thin interbed analytical method of a characteristic slice. The method comprises: step 1, extracting a continuous stratum slice from a seismic section; step 2, carrying out pretreatment on the continuous stratum slice; step 3, analyzing the number of sand bodies, a distribution range of the sand bodies, and a superposition relation of the sand bodies by using an in-phase method; step 4, in the distribution range of the certain determined sand body, determining the characteristic slice position of the sand body by using a characteristic slice zero value method and determining the apparent thickness of the sand body; step 5, carrying out traversal processing on each determined sand body; and step 6, calculating actual time thicknesses of all sand bodies by using the apparent thickness of the characteristic slice. The method has the following beneficial effects: the -90-degree seismic continuous slice study is used as the core; only the seismic amplitude information is needed during the analysis process and the sand body can be predicted directly and effectively; and an error caused by involvement of methods of frequency extraction and time frequency analysis and the like can be avoided.

Description

technical field [0001] The invention relates to the technical field of seismic slices, in particular to a feature slice thin interbed analysis method. Background technique [0002] In the sedimentary basins of continental clastic rocks, the reservoirs are seldom thick layers, but mostly thin interbeds, the thickness of which is usually between 3-10m, so an event on the seismic section is often a sand body The comprehensive superposition effect of concentrated segments (thin interlayers, such as figure 1 ). Conventional seismic data analysis methods are difficult to distinguish, which makes it more difficult to identify thin sand layers in the vertical direction and to identify the distribution of sand bodies in the horizontal direction. [0003] In the interpretation method of thin layers, seismic slice plays a very important role. Since sand-shale interbedded deposits are common in continental basins in China, seismic slices can be used as an effective interpretation tool...

AI Technical Summary

Problems solved by technology

Unlike sparse deconvolution, this method is driven by geological data rather than constrained by mathematical assumptions. It is much higher than the resolution of the initial data. Although geophysicists have made unremitting efforts to explore new methods, but in In practice, the seismic characterization of thin interbeds is still a difficult problem

Many geophysics researchers have conducted continuous research and exploration on the method of improving resolution by compressing wavelets, but as far as the current status of seismic data acquisition and processing is concerned, seismic data based on event tracking and Interpretation methods are still difficult to finely interpret and predict exploration targets with a single sand body thickness less than 10m

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