A Fine Calibration Method for Thin Sand-mudstone Interbed Horizons

Abstract

The invention discloses a method for fine calibration of the position of a sand shale thin interbed. The method comprises the steps of 1, determining log layering and single well facies features of a marker bed and the sand shale thin interbed under the guiding of lithofacies and log facies modes; 2, loading seismic and logging data; 3, judging section polarity; 4, identifying and analyzing the seismic section features of the marker bed and the seismic facies features of the sand shale thin interbed; 5, determining the basic frequency of well side seismic channel seismic data by means of statistic wavelets, and selecting a Ricker wavelet of the basic frequency for primary calibration of the marker bed under the guiding of the seismic facies mode; 6, selecting a definite wavelet for secondary calibration; 7, adopting a time-varying wavelet for research of corresponding relation between a whole well and a multi-target stratum; 8, verifying a calibration result according to the relation between amplitude and reflection coefficient sequence envelope. The method has great basic significance for exploration, development, research and application of sand shale thin interbed oil deposit.

Description

technical field [0001] The present invention relates to a method for analyzing and calibrating beach bar sandstones in the field of petroleum exploration and development geology, and in particular refers to a method based on lithofacies division, combined with the corresponding relationship between logging data and seismic data, in geological stratification and On the basis of analyzing the characteristics of seismic horizons, through the application of different types of wavelets and the research of different calibration methods, it is a method of finely calibrating sand-mudstone thin interbedded horizons. Background technique [0002] At present, the comprehensive interpretation and analysis of lithofacies, logging and seismic data is the most basic and important comprehensive analysis method in the process of oil and gas exploration and development. Accurate calibration of thin sand-shale interbeds is the key factor for accurate structural interpretation, and it is also ...

AI Technical Summary

Problems solved by technology

The above two methods start from the two parameters formed by synthetic records, which are reasonable to a certain extent, but ignore the characteristics of wavelet formation and study from the calibration process, especially for sand-mudstone thin interbed horizons, the calibration is accurate The degree is not high, affecting the progress of oil and gas exploration

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