Method, device and computer storage medium for predicting salt window of salt-bearing basin

Abstract

The invention relates to a method, a device and a computer storage medium for predicting a salt window in a salt-bearing basin. The method includes the following steps: a. According to the salt rock deformation mechanism, analysis of petrophysical characteristics and seismic profile comparison, summarizing the seismic data at the development location of the salt window. response characteristics; b, based on the seismic response characteristics in the step a, interpret the earthquake at the top and bottom interfaces of the salt rock in the target area, and obtain the interpretation results of the top and bottom of the salt rock; c based on the salt rock top and bottom in the step b The bottom interpretation result is used to draw the salt rock thickness plane distribution map, and the potential salt window plane distribution range is preliminarily determined according to the salt window thickness threshold; d Based on the preliminary determination of the potential salt window plane distribution range in the step c, the construction is based on the conventional seismic attribute analysis. "Energy frequency ratio" seismic attribute, and then predict the distribution of salt window. The present invention utilizes the "energy-frequency ratio" seismic attribute extraction based on salt rock top horizon interpretation, which is less affected by seismic quality and interpreter's experience, and has stronger operability.

Description

technical field [0001] The invention relates to a method, a device and a computer storage medium for predicting a salt window in a salt-bearing basin, and belongs to the technical field of oilfield exploration. Background technique [0002] In the hydrocarbon accumulation system of salt-bearing basins, rock salt is a kind of high-quality caprock, and the salt window refers to the area where the local deposition on the salt is in direct contact with the sub-salt stratum caused by the salt activity, and the thickness of the salt rock layer is zero. The oil and gas generated by the sub-salt oil source migrates upward to the reservoir through the salt window, which is an important accumulation model in the salt-bearing basin, that is, "lower generation and upper storage". Gas goals are important. [0003] However, in the actual oilfield exploration, it is found that the current salt window prediction has the following problems: (1) The research on the salt window at home and ab...

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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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