Earthquake strong shielding time-frequency information extraction and stripping method based on phase control

Abstract

The invention provides an earthquake strong shielding time-frequency information extraction and stripping method based on phase control. The method comprises the following steps: 1, performing well-to-earthquake calibration and horizon tracking on earthquake data; 2, performing logging facies and near-well seismic facies analysis on a typical well, and roughly dividing a phase zone; 3, extractingseismic attributes from determined horizon upper and lower time window ranges, screening characteristic attributes with good performance for combinatorial analysis, and determining an accurate sedimentary facies strip graph; 4, performing generalized S transformation on the seismic data of a target processing layer to extract algorithm parameters; 5, determining variable wavelet information participating in the algorithm; and step 6, matching the optimal wavelet according to the multiphase band waveform characteristics to carry out strong layer stripping. The earthquake strong shielding time-frequency information extraction and stripping method based on phase control can provide shielding removal data for subsequent attribute extraction, oil and gas reservoir identification and reservoir prediction, so that the identification and exploration and development capability of a beach and dam sand weak signal layer is improved.

Description

technical field [0001] The invention relates to the field of seismic reservoir prediction and description, in particular to a method for extracting and stripping time-frequency information of strong seismic shielding based on phase control. Background technique [0002] With the deepening of oil and gas development, the types of sediments and reservoirs involved in exploration are diversified. Beach-bar sand reservoirs are a very important type of oil and gas reservoirs. With the advancement of exploration technology and improvement of development technology, such reservoirs, which were not paid much attention before, are increasingly being paid attention to by oil fields. Because beach-bar sand reservoirs are mostly thin layers and thin interbeds, and the overburden on the upper part of the reservoir has shielding effects, conventional processing and interpretation methods are often disturbed, resulting in unclear distribution characteristics of reservoirs, increased diffic...

AI Technical Summary

Problems solved by technology

Because beach-bar sand reservoirs are mostly thin layers and thin interbeds, and the overburden on the upper part of the reservoir has shielding effects, conventional processing and interpretation methods are often disturbed, resulting in unclear distribution characteristics of reservoirs, increased difficulty in identification, and difficulty in fine storage. Layer Description and Prediction

In particular, the strong shielding layer also has changes in the vertical and horizontal geological structures and sedimentary facies, which makes the conventional strong shielding technology helpless. It is urgent to develop new methods and technologies to solve this exploration problem.

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