Prediction method and device for salt window of salt-containing basin and computer storage medium

Abstract

The invention relates to a prediction method and device for a salt window of a salt-containing basin and a computer storage medium. The method comprises the steps of a, summarizing seismic response characteristics of a salt window development position according to a salt rock deformation mechanism, rock physical characteristic analysis and seismic profile comparative analysis; b, based on the seismic response characteristics in the step a, interpreting earthquakes of the target area salt rock top and bottom interfaces to obtain salt rock top and bottom interpretation results; c, drawing a salt rock thickness plane distribution diagram based on the salt rock top and bottom interpretation results in the step b, and preliminarily determining a potential salt window plane distribution range according to a salt window thickness threshold value; and d, on the basis of the potential salt window plane distribution range preliminarily determined in the step c, constructing an energy-frequency ratio seismic attribute on the basis of conventional seismic attribute analysis, and then predicting salt window distribution. According to the method, extraction of the energy-frequency ratio seismic attribute is based on salt rock top surface horizon interpretation, the influence of seismic quality and interpretation personnel experience is smaller, and the operability is higher.

Description

technical field [0001] The invention relates to a prediction method, device and computer storage medium of a salt window in a salt-bearing basin, belonging to the technical field of oil field exploration. Background technique [0002] In the oil and gas accumulation system of salt-bearing basins, rock salt is a high-quality cap rock, and the salt window refers to the area where the salt activity leads to direct contact between the local deposition on the salt and the sub-salt formation, and the thickness of the salt rock layer is zero. Oil and gas generated from pre-salt oil sources migrate upwards to reservoirs through salt windows, which is an important accumulation mode in salt-bearing basins, that is, "generated from below and stored above". Air targets are of great significance. [0003] However, in actual oilfield exploration, the following problems exist in the prediction of salt windows: (1) The research on salt windows at home and abroad mainly focuses on the evolu...

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Problems solved by technology

[0003] However, in actual oilfield exploration, the following problems exist in the prediction of salt windows: (1) The research on salt windows at home and abroad mainly focuses on the evolution of related salt structures, while there are few systematic studies on salt window prediction methods; (2) The prediction target is the thin or missing area of ​​the salt window, which is generally 0m-50m thick. Due to the limitation of the buried depth of the stratum and the seismic resolution, it is difficult to accurately predict its distribution range; (3) conventional based on The evaluation method for determining the thickness of salt rock in the top-bottom interpretation of salt rock is affected by the quality of data and interpretation experience, and has a large number of solutions

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