Method for establishing solution vug reservoir body distribution model of fractured-vuggy carbonate rock reservoir

Abstract

The invention provides a method for establishing a solution vug reservoir body distribution model of a fractured-vuggy carbonate rock reservoir, and belongs to the field of three-dimensional geologic modeling of carbonate rock reservoirs. The solution vug reservoir body distribution model of the fractured-vuggy carbonate rock reservoir of a modeling target stratum is established according to the characteristic that the development of solution vug reservoir bodies is controlled by large-sized karst cave distribution. Great differences in reservoir body space scales between the solution vug reservoir bodies and other reservoir bodies such as large-sized karst cave reservoir bodies are taken into account, and a solution vug reservoir body model is independently established, so that the three-dimensional distribution of the solution vug reservoir bodies can be described more finely; and moreover, a relationship between distances to large-sized karst caves and quantitative development probabilities of the solution vug reservoir bodies is established, the distribution rules of the solution vug reservoir bodies are reflected more objectively by the model established under the constriction of the relationship, a more objective and more real three-dimensional solution vug reservoir body distribution model is established, and the accuracy of a geologic model of the fractured-vuggy carbonate rock reservoir is improved.

Description

technical field [0001] The invention belongs to the field of three-dimensional geological modeling of carbonate rock reservoirs, and in particular relates to a modeling method for the distribution model of dissolved pore-cavity reservoirs of carbonate rock fracture-cavity reservoirs. Background technique [0002] Three-dimensional geological modeling is the key to geological research of oilfield development, and three-dimensional distribution model of reservoir is the core content of three-dimensional geological model of oil reservoir. [0003] Existing mature modeling methods are mainly aimed at clastic rock reservoirs of conventional sedimentary origin, and are not suitable for carbonate rocks formed by paleokarstification (that is, karstification) with large caves, dissolved pores, and fractures as storage spaces. Fracture-cavity reservoirs. At present, there are few researches on the modeling of this kind of reservoir body. Domestic related researches started at the beg...

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Problems solved by technology

However, the above-mentioned existing methods are often based on seismic data, and the established models can only characterize the three-dimensional distribution of large-scale karst-vug reservoirs. The disadvantage is that the important storage space next to large-scale karst-vug reservoirs—dissolution-vug reservoirs is ignored.

In addition, the existing methods lack the constraints of geological laws in the modeling process, that is, the constraints of the distribution of reservoirs, less consideration is given to the control of karst origin, and the simple use of well and seismic data to directly simulate the distribution of reservoirs is often inconsistent with geological reality. Compared with the resolution of seismic data, the accuracy is not significantly improved. It is obvious that the existing methods cannot meet the requirements of fine 3D geological modeling of carbonate fracture-cavity reservoirs.

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