Evaluation method and device for fracture development degree of reservoir

Abstract

Embodiments of the invention provide a method and a device for evaluating development degree of reservoir fractures. The method comprises: determining fracture strength in a first type single sand body of each sand body in a to-be-logged well and fracture strength in a first type layer in a target stratum according to determined first type sand body information and first posterior probability; evaluating fracture development degree of each sand body in the to-be-logged well based on the fracture strength of the first type single sand body and preset fracture strength evaluation criteria in thesingle sand body; based on the fracture strength in the first type layer and the preset fracture strength evaluation criteria, evaluating the fracture development degree of the target stratum in theto-be-logged well. The method gives consideration to other characteristics reflecting the fracture development degree, and can evaluate the fracture development degree in the target stratum and the fracture development degree of each sand body in the to-be-logged well respectively, so as to make more objective and comprehensive evaluation on the fracture development degree of a single well.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of petroleum geophysical exploration and development, and more specifically, to a method and device for evaluating the development degree of reservoir fractures. Background technique [0002] Fractures are storage spaces and migration channels for oil and gas, and their development status has an important impact on oil and gas exploration. In the early stage of oil exploration and development, accurately evaluating the development of reservoir fractures is helpful to determine the exploration target area and formulate the development plan. Therefore, it is very important to evaluate the development degree of reservoir fractures. [0003] At present, reservoir fracture logging interpretation can reflect whether a single well has fractures at a certain depth or the probability of fracture development intensity. However, in practical applications, it is often necessary to compare the ...

AI Technical Summary

Problems solved by technology

Usually, the fracture development degree of tight reservoirs is evaluated by dividing the length of the fracture development section by the reservoir thickness, that is, the logging evaluation of the fracture development degree of tight reservoirs is performed by the ratio of the fracture development section length to the reservoir thickness. This method only considers the vertical scale of the fracture, and does not consider other characteristics that reflect the degree of fracture development, such as the opening of the fracture and the lateral scale of the fracture, which will make the evaluation results relatively one-sided and not objective and accurate

Images