Method for identifying high-water-consumption stratum zone of oil reservoir by using streamline density

Abstract

The invention discloses a method for identifying an oil reservoir high-water-consumption layer zone by using streamline density, which comprises the following steps of: establishing a quantitative high-water-consumption layer zone judgment standard by using a streamline density change rule, dividing grids after layering an oil reservoir, calculating the streamline density of different grids, and finding the maximum value and the minimum value of the streamline density of each layer and the whole oil reservoir. Dividing grids with different water consumption degrees on the basis of the dichotomy thought, then calculating the maximum value and the minimum value of accumulated external water displacement multiples of different grids in the second potential high-water-consumption water layer zone through a fuzzy comprehensive evaluation method, then performing interval division, and finally performing superposition calculation on the streamline density of the same grid and the external water displacement multiples to obtain the maximum value and the minimum value of the accumulated external water displacement multiples in the second potential high-water-consumption water layer zone. The quantitative high-water-consumption layer zone judgment method is established, the distribution rule of the high-water-consumption layer zone is accurately represented, meanwhile, the change of the water content of an oil layer and the distribution rule of remaining oil can be qualitatively observed, and a reference basis is provided for efficient development of a water injection oil field.

Description

technical field [0001] The invention relates to a method for identifying a high water consumption layer zone of an oil reservoir by using streamline density, and belongs to the technical field of petroleum geological exploration. Background technique [0002] The invention belongs to the technical field of petroleum development. When the oil reservoir enters the water injection development stage, it will be soaked and scoured by the injected water, resulting in changes in the pore structure and physical parameters of the reservoir. In addition, due to the influence of heterogeneity, the injected water is easy to Plane and vertical advance along the high permeability section, forming a dominant seepage channel between oil and water wells, in which the injected water does inefficient or ineffective circulation, and the utilization rate is low, which is not conducive to improving the sweep coefficient and oil displacement efficiency, so it is also called High water consumption ...

AI Technical Summary

Problems solved by technology

However, at present, there is no relatively complete characterization and identification method for high water consumption zones at home and abroad. Most of the analysis results of existing methods are qualitative, and there is a lack of identification methods that combine quantitative and qualitative analysis.

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