A detection method of avo attribute intersection hydrocarbons based on angle rotation

Abstract

The invention discloses a method for detecting hydrocarbons intersected by AVO attributes based on angle rotation, and belongs to the field of geophysical exploration. Through the forward modeling simulation of the geological layer to be studied, the AVO attribute data of several sampling points in the geological layer to be studied are obtained, and the AVO attribute intersection map is obtained, and the trend fitting is performed on all the sampling points in the AVO attribute intersection graph, and the proposed Fit the straight line, translate and fit the straight line to get the background line through the origin, take the background line and its vertical line as the coordinate axis, and rotate the angle between the background line and the horizontal axis of the AVO attribute intersection graph for all sampling points around the preset coordinate points degrees, and the rotated AVO attribute intersection diagram is obtained, which strengthens the display of different AVO anomaly classifications, facilitates intuitive identification of AVO fluid anomaly classifications, and quantitatively detects the value range of hydrocarbons through AVO attributes.

Description

technical field [0001] The invention belongs to the field of geophysical exploration, in particular to a method for detecting hydrocarbons intersected by AVO attributes based on angle rotation. Background technique [0002] AVO is the English abbreviation of Amplitude Variation with Offset (Amplitude Variation with Offset). The AVO attribute analysis technology uses the principle that the reflection coefficient varies with the incident angle to analyze the relationship between seismic reflection amplitude and offset variation on the prestack gather. , an important technology for identifying lithology and detecting gas-bearing properties, mainly uses the AVO characteristic response formed by the difference in Poisson's ratio to distinguish reservoirs from non-reservoirs, and the difference in Poisson's ratio is determined by It is caused by different lithology or oil and gas, and various AVO attributes such as P-wave impedance reflectivity, S-wave impedance reflectivity, elas...

AI Technical Summary

Problems solved by technology

[0005] In the application of actual data, especially in carbonate reservoirs, the intersection of P and G attributes often results in a large distribution range of AVO fluid anomalies, overlapping of anomalous areas and non-anomalous areas, and inconspicuous fluid anomalies. There are multiple solutions in the type division, and it is difficult to distinguish AVO attribute exceptions by using the traditional AVO attribute intersection method

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