Formation pressure correction method based on curvature

Abstract

The invention discloses a formation pressure correction method based on curvature. The method comprises the following steps: 1, a formation pressure 3D data volume P is acquired; 2, in view of a seismic interpretation horizon in the same range as the 3D data volume P, curvature attributes are extracted, and the curvature attributes are normalized as a contribution rate a of an extrusion structureto the formation pressure; 3, based on formation data, an extrusion structure stress function sigmaT is fit; and 4, a formation pressure 3D data volume PM after correction is calculated according to the following formula: PM=P+a.sigmaT. The curvature attributes are introduced during the formation pressure correction process, the contribution of the extrusion structure to the formation pressure canbe effectively reflected in the space, and a more accurate formation pressure prediction result can be acquired.

Description

technical field

[0001] The invention relates to geophysical technology, in particular to a method for correcting formation pressure based on curvature. Background technique

[0002] Obtaining accurate formation pressure distribution is the key to horizontal well fracturing technology, and it is also crucial for the development of shale gas. At present, the methods used for formation pressure prediction, monitoring and detection mainly include geological analysis method, seismic method, dc index method and well logging method, etc. Both the geological analysis method and the seismic method belong to the pre-drilling prediction, and can be used to macroscopically delineate the abnormal pressure zone when the deep strata in the new area are surveyed and there is no drilling and logging data, but the accuracy is low. The dc index method belongs to the prediction while drilling, and the judgment of lithology is not accurate enough, and the calculated pressure value is also affec...

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