Extraction and stripping method of time-frequency information of strong seismic shielding based on phase control

Abstract

The present invention provides a method for extracting and stripping seismic strong shielding time-frequency information based on phase control, comprising: step 1, performing well seismic calibration and horizon tracking on seismic data; Seismic facies analysis, rough division of facies zones; Step 3, extract seismic attributes from the upper and lower time windows of the horizons, select the characteristic attributes with good performance for combined analysis, and determine the accurate sedimentary facies zone map; Step 4, deal with the seismic data of the target layer Perform generalized S transform to extract algorithm parameters; step 5, determine the variable wavelet information participating in the algorithm; step 6, perform strong layer stripping according to the multiphase band waveform feature matching the best wavelet. The phasing-based seismic strong shielding time-frequency information extraction and stripping method can provide unshielded data for subsequent attribute extraction, oil and gas reservoir identification and reservoir prediction, thereby improving the identification and exploration and development capabilities of weak signal layers in beach-bar sand.

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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