Ground stress direction determination method and device, storage medium and computer equipment

Abstract

The invention provides a ground stress direction determination method and device, a storage medium and computer equipment. The method comprises the following steps: acquiring a rock core sample of a stratum at a target depth, measuring longitudinal wave speeds of longitudinal waves in a plurality of different diameter directions when the longitudinal waves are propagated in the rock core sample, and determining the direction of ground stress in the rock core sample according to the longitudinal wave speeds in the different diameter directions; comparing the texture characteristics of the side surface of the rock core sample with the texture characteristics of the well wall of the sampling well of the rock core sample at the target depth, and determining the relative orientation of the rock core sample and the well wall of the sampling well at the target depth according to the comparison result; and according to the direction of the crustal stress in the core sample and the relative orientation of the core sample and the well wall of the sampling well at the target depth, determining the direction of the crustal stress in the stratum at the target depth. The method is strong in theoretical basis, can be used for ground stress direction judgment of various reservoirs, especially stratums with small plastic change, and is beneficial to optimization of well body tracks and reasonable arrangement of hydraulic fracturing directions.

Description

technical field [0001] The invention relates to the technical fields of petroleum geology and petroleum engineering, in particular to a method, device, storage medium and computer equipment for determining the direction of in-situ stress. Background technique [0002] In-situ stress plays an increasingly important role in petroleum exploration and development. In-situ stress is a key factor affecting the effect of fracturing. In oilfield reservoir stimulation, the state of stress field determines the shape, orientation, height and width of hydraulic fractures, which has an impact on the effect of fracturing stimulation; well pattern layout and adjustment in development need to study the stress field, Otherwise, the oil displacement efficiency may be reduced, the water-free oil recovery period may be shortened, and phenomena such as water channeling and water flooding may occur. Therefore, in-situ stress research based on formation characteristics is a necessary part of res...

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Problems solved by technology

1. The direct measurement method, using instruments to measure the in-situ stress is relatively accurate, but the amount of data is too small, the cost is high, and lacks continuity, so it is not suitable for obtaining large-scale in-situ stress data; 2. Acoustic-electric imaging logging data Evaluation method, the difficulty of this method is that for formations with little difference in stress intensity, it is difficult to obtain the characteristics of response stress deformation from the acoustic-electric image, such as induced fractures; 3. Numerical simulation method, numerical simulation of stress distribution is mostly based on measured data Based on the topography and geological characteristics, the model is established for inversion back calculation and simulation. The difficulty is that it is difficult to understand the regional geological conditions, and single well data is also required as a constraint; 4. Earthquake prediction method, the difficulty of the method lies in It is necessary to consider the influence of tectonic stress, pore pressure and other parameters on the in-situ stress

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