Method and device for determining reservoir heterogeneity

Abstract

The invention provides a method and a device for determining reservoir heterogeneity. The method includes the following steps: reservoirs to be measured are equally grouped according to a preset depth interval, so that a plurality of depth groups are obtained; a permeability mean value of each depth group among the plurality of depth groups is obtained; according to the permeability mean value of each depth group, a vertical heterogeneity index of the reservoirs to be measured is worked out; and according to the vertical heterogeneity index of the reservoirs to be measured, a heterogeneity degree of the reservoirs to be measured is determined. In the embodiment of the invention, the reservoirs to be measured are divided into the plurality of depth groups, the permeability mean value of each depth group is calculated, and thereby the heterogeneity of the whole reservoirs is finally determined; because all stratum contents in each depth group among the reservoirs to be measured, rather than core samples, are the basis in the process of determining heterogeneity, relative to the prior art, the determined heterogeneity result is more accurate, and based on the more accurate heterogeneity result, the efficiency of oil and gas exploitation can be effectively increased.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method and a device for determining reservoir heterogeneity. Background technique [0002] Reservoir heterogeneity can refer to the attributes of various properties of the reservoir that change with the spatial location, mainly manifested in the heterogeneity of rock material composition and the heterogeneity of pore space. For example, clastic rock reservoirs have different rock mineral composition, matrix content, and cement content due to the difference in sedimentation and diagenesis, which can affect the change of pore shape, size, and reservoir physical properties, and form reservoir layers. Heterogeneity within, in plane, and between layers. [0003] Existing methods for determining reservoir heterogeneity generally collect core samples at multiple depths of the reservoir, then test the permeability of each core sample, and then use statistical methods to...

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Problems solved by technology

[0004] However, due to the variability in the distribution of geological structures in the reservoir, determining the heterogeneity of the reservoir only by the permeability of the core sample can easily lead to inaccurate final results, and it is difficult to reflect the real heterogeneity of the reservoir to be tested sexual situation

[0005] For the above problems, no effective solutions have been proposed so far

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