Method for analyzing and NMO correcting two parameters transformation wave speed

Abstract

The invention belongs to a method of processing and explaining the seismic data in the oil exploration field and is a velocity analysis and NMO correction method of two-parameter converted wave. The method comprises the following steps of: extracting CMP gather and conducting conventional overlap velocity analysis to obtain NMO correction velocity of longitudinal waves; extracting CMP gather of converted waves; with the CMP gather data of the converted waves as input data, conducting initial velocity ratio analysis with a formula (A); with the common shot point gather of the converted wave as input data, conducting common conversion points (CCP) position calculation by using the NMO correction velocity of the longitudinal waves and the initial velocity ratio obtained via analysis so as to extract CCP gather; conducting velocity ratio analysis with the formula (A); conducting NMO correction on CCP gather of the converted waves with a formula (B); extracting CCP gather of final converted waves and converted waves overlap.

Description

technical field [0001] The invention belongs to the seismic data processing and interpretation method in the field of petroleum exploration, and relates to the indoor processing part of converted wave seismic signals, in particular to a two-parameter converted wave velocity analysis and dynamic correction method. Background technique [0002] The underground strata are mostly distributed in layers, and they are formed by sediments in different geological periods through deposition, burial, compaction, diagenesis, etc., as well as long-term geological processes such as structural deformation, weathering, and erosion in the later period. At the same time, the dead animals and plants are encased in soil and sand and buried underground together. Under certain underground warm conditions, the buried organic matter undergoes a series of biochemical, catalytic, and other degradation processes. It becomes natural gas and oil. After the generated oil and natural gas migrated to sand...

AI Technical Summary

Problems solved by technology

There are many input parameters, and the analysis error is large

[0020] (4) Velocity analysis and co-conversion point gather extraction are interrelated and causal. The two restrict each other, and the errors are transmitted to each other, forming a self-closed error loop scaling system, which cannot be finally eliminated through repeated iterations.

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