Fractured reservoir geomechanical modeling grid cell size determination method

Abstract

The invention relates to the field of oil and gas field exploration and development, in particular to a fractured reservoir geomechanical modeling grid cell size determination method. The fractured reservoir geomechanical modeling grid cell size determination method comprises the steps of: determining a reservoir mechanical parameter change range by means of rock dynamic and static mechanical parameter calculation; establishing a three-dimensional crack discrete network model by means of field crack observation; determining fracture surface mechanical parameters on the basis of a fracture surface mechanical experiment; researching equivalent mechanical parameters of models with different sizes by adopting a three-cycle method; and respectively calculating the size effect and anisotropy offractured reservoir mechanical parameters, and finally determining the size of an optimal geomechanical modeling grid cell. The method for determining the size of the optimal grid cell for fractured reservoir geomechanical modeling is provided by the invention, and the prediction result has a reference value for reservoir geomechanical modeling, stress field numerical simulation, reservoir fracture prediction, 'engineering sweet spot 'evaluation and other aspects.

Description

technical field [0001] The invention relates to the field of exploration and development of oil and gas fields, in particular to a method for determining the size of grid units in geomechanical modeling of fractured reservoirs. Background technique [0002] Rock mechanical parameters, including rock Poisson's ratio, rock strength parameters, various elastic modulus, internal friction angle, and cohesion, etc., are used for ancient stress field simulation, current in-situ stress simulation, fracture dynamic and static parameter prediction, and reservoir water injection pressure, etc. important basic data for research. In the division of grid units in geomechanical modeling, how to determine the size of the unit body is often a problem that researchers tend to ignore. Previously, the size of the grid unit was often determined according to the requirements of exploration and development or the software and hardware conditions of the computer, but this Whether the size of the g...

AI Technical Summary

Problems solved by technology

In the division of grid units in geomechanical modeling, how to determine the size of the unit body is often a problem that researchers tend to ignore. Previously, the size of the grid unit was often determined according to the requirements of exploration and development or the software and hardware conditions of the computer, but this Whether the size of the grid unit is reasonable or not often lacks systematic and scientific analysis

In geomechanics modeling, if the size of the grid unit is too small, the grid unit cannot truly reflect the size of the mechanical parameters of the location; if the grid unit is too large, it will affect the accuracy of the later numerical simulation on the one hand, , the difference between adjacent grid cells becomes smaller, and the practicability of numerical simulation will decrease

Images