Tectonic background-based gravity fracture image recognition method

Abstract

The invention provides a tectonic background-based gravity fracture image recognition method. The tectonic background-based gravity fracture image recognition method comprises the steps: 1, bouguer gravity anomaly preprocessing is conducted, and basic data for carrying out processing and explaining is formed; 2, gravity difference trend surface field source separation is conducted, and gravity anomaly responses of a target strata are quantitatively depicted; 3, gravity anomaly enhancing and processing conversion are conducted, linear structure weak information is enhanced, and small-level fracture linear images are highlighted; 4, multiple processing conversion results are jointed to establish a nonlinear target function of a narrowing gradient zone; and 5, comprehensive analysis on the fracture linear images is conducted, and different levels of fracture occurrences and combination forms are determined. According to the tectonic background-based gravity fracture image recognition method, the effectiveness and practicability that gravity data fine depict a fracture target are improved, the lateral resolving capacity is improved, the fracture boundary characteristic is highlighted,and a fracture tectonic framework can be clearly recognized.

Description

technical field [0001] The invention relates to the technical field of regional structural fracture identification, in particular to an image identification method for gravity fractures based on structural background. Background technique [0002] Research on faults is of great significance in prospecting for ore, water, oil and gas, and construction of water conservancy projects, because faults are channels for ore fluids and control the formation and occurrence of ore bodies. Faults can also destroy the formed ore bodies, and the continuation of the ore bodies can only be inferred based on the nature of the faults. Faults are important pathways for oil and gas migration and enrichment, and fault structures must be ascertained in oil and gas exploration. When carrying out engineering construction, it is necessary to have a detailed understanding of the fault conditions of the foundation to determine a better engineering base and ensure the stability of the project. [000...

AI Technical Summary

Problems solved by technology

However, these conventional methods have some technical defects, such as not obvious fracture boundary features, wide gradient zone, low lateral resolution, and inaccurate identification of fracture position and trend; in addition, because only abnormal step zones are processed, it is impossible to Finely describe the nature of different levels of fractures in the region, resulting in low accuracy in identifying fractures from gravity data

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