Method and device for determining fracture

Abstract

Embodiments of the application disclose a method and device for determining a fracture. The method includes the steps of determining a fracture density of a grid at a drilling location in a target work area based on an inclination of a fracture in attribute information; determining the sedimentary facies data, facies data, rock fracture index and fracture development strength of the grid in the target work area; based on the sedimentary facies data, facies data, rock fracture index and fracture development strength of the grid and the fracture density of the grid at the drilling location, determining the fracture density of the grid at a non-drilling location in the target work area, and taking the fracture density of the grid at the drilling location and the fracture density of the grid at the non-drilling location as a fracture density body of the target work area; and based on production dynamics data of the target work area and the attribute information of the fracture, correctingthe fracture density body to obtain a corrected fracture density body. The technical scheme provided by the embodiments of the application can improve the precision of the determined fracture.

Description

technical field [0001] The present application relates to the technical field of geological exploration, in particular to a method and device for determining fractures. Background technique [0002] In the field of geological exploration, oil and gas reservoirs are generally strata with certain fractures. Among them, there are often a large number of developed small-level fractures and micro-fractures in the reservoir. These fractures can transform the storage space of the reservoir and greatly increase the porosity of the reservoir, so that the reservoir can better store oil. The oil and gas reservoirs in the microfracture concentrated development area are fractured oil and gas reservoirs. Therefore, determining fractures is an important part of accurate oil and gas reservoir prediction. [0003] At present, the main process of conventional methods for determining fractures is to obtain seismic data of the target work area, use methods such as seismic coherent body and an...

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Problems solved by technology

However, due to the diversity of factors controlling fracture development, the development of fractures has strong randomness and heterogeneity. The fracture determination methods in the prior art need to be based on abundant and high-precision seismic data. In this way, for seismic In areas with low data precision or few seismic data, still adopting the existing technology method may lead to low precision of the determined fractures, resulting in low precision of the established DFN model, so it is necessary to develop a set of New method for identifying fractures to provide reliable fracture models for subsequent production development

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