Along-curved-surface gravitational field inversion method and device based on target layer

By layer-by-layer peeling and deconvolution processing in the Bug gravity anomaly field, the problem that existing density inversion technology can only achieve density inversion at a certain depth is solved, effective density inversion and interference signal removal of complex target layers are achieved, and more accurate density superposition field is provided.

CN119717037APending Publication Date: 2025-03-28PETROCHINA CO LTD
3 Cites 1 Cited by

Patent Information

Application Number
CN202311251543.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-26
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing density inversion technology can only achieve density inversion at a certain depth and cannot effectively eliminate the impact of interference signals in the target layer with complex and variable structures.

Method used

By taking the target layer surface as constraint, the shallow residual gravity anomaly field is peeled off layer by layer in the Bug gravity anomaly field, and the area gravity anomaly field below the target layer is subtracted to obtain the residual gravity anomaly field of the target layer surface. Combined with the degree of undulation of the target layer surface, the inversion is performed using deconvolution to obtain the density superposition field of the target layer surface.

Benefits of technology

The interference signal is effectively proposed, and the separation results have good direction selectivity and weaker depth aliasing properties, which can accurately identify the density changes of the target layer and provide a more accurate density superposition field, providing a basis for subsequent density change interface prediction and oil, gas and water enrichment area identification.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention relates to the technical field of geophysical exploration, in particular to an along-curved-surface gravitational field inversion method and device based on a target layer, and the method comprises the steps: taking a target layer curved surface of a target region as a constraint, peeling off a shallow-layer residual gravity anomaly field in a Bouguer gravity anomaly field of the target region layer by layer, and subtracting a region gravity anomaly field below the target layer to obtain a gravity anomaly field; obtaining a residual gravity anomaly field of the target layer curved surface; and in combination with the fluctuation degree of the curved surface of the target layer, performing inversion on the residual gravity anomaly field of the curved surface of the target layer by using deconvolution to obtain a density superposition field of the curved surface of the target layer. According to the method, a new along-curved-surface gravity field inversion method is established, depth parameters of a target layer curved surface are considered during inversion calculation, interference signal influences are eliminated, a density field signal along the curved surface is obtained, a density superposition field of the target layer curved surface is obtained, and an oil-gas-water enrichment area is depicted for follow-up density change interface prediction and oil-gas-water enrichment area depicting. And a basis is provided for providing reference suggestions for well position deployment and production regulation and control.
Need to check novelty before this filing date? Find Prior Art