Three-modulus-based shale ground stress three-dimensional seismic characterization method

Abstract

The invention relates to a three-modulus-based shale ground stress three-dimensional seismic characterization method. Firstly, three-dimensional seismic characterization of a shale ground stress is achieved. Different logging information of a stratum is analyzed and judged through regressive analysis by utilizing actual logging data, three-modulus rock physics elastic parameters are preferably regarded as characterization independent variables for stress evaluation, and a maximum principal stress and a minimum principal stress are characterized; the advantages of a seismic data three-dimensional data volume are exerted in space variation prediction, and an elastic parameter data volume of stress characterization is obtained through inversion by combining a seismic prestack elastic inversion technology. Finally, the three-dimensional quantitative evaluation of the ground stress is achieved through analyzing and correcting errors of the data volumes, thereby providing a three-dimensional quantitative judgment method for prediction and effective evaluation of the ground stress, and effectively solving the problem of stress seismic prediction. The three-modulus-based shale ground stress three-dimensional seismic characterization method increases the precision of stress prediction, and provides effective technical guidance for unconventional oil and gas exploration.

Description

technical field [0001] The invention relates to the technical field of geological exploration data processing of unconventional oil and gas reservoirs, in particular to a three-dimensional seismic prediction that uses rock physical parameters as the analysis basis and uses rock elastic modulus to predict in-situ stress, and is a quantitative characterization method for in-situ stress . Background technique [0002] In-situ stress is one of the important evaluation parameters for oil and gas enrichment and accumulation, and the superior productivity of reservoirs. Its related theories are now applied in various links of oil and gas exploration and development. The in-situ stress field and its evolution are closely related to the migration and accumulation of oil and gas. . In oil and gas field development and engineering, the study of in-situ stress is now widely used in oil layer fracturing, oil layer perforation, well pattern deployment, reservoir fracture prediction, casi...

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Problems solved by technology

Accurate prediction of in-situ stress has always been a difficult problem to be solved. In the past, the research on in-situ stress was mostly based on the establishment of mathematical stress models, and the in-situ stress prediction based on elastic finite element method simulation and neural network was carried out, mainly based on the mathematical stress model The well-logging calculation method based on this method has great limitations and errors. The calculation results are mostly based on the well point stress, and the precision of the forward modeling and extrapolation of the stress model is limited, and due to the heterogeneity of the actual formation internal stress, The stress prediction ability based on model calculation is limited, and it is difficult to realize the prediction of the ground stress plane in a large area

Through searching, there is no relevant literature on the prediction and evaluation of in-situ stress using seismic data, and no scholars use seismic data to predict and evaluate in-situ stress

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