A modeling method for the distribution model of large dissolved-vug reservoirs in carbonate fractured-cavity reservoirs

Abstract

The invention provides a method for establishing a large-sized karst cave 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 method comprises the following steps of: (1) identifying a large-sized karst cave reservoir body development section on a single well, wherein the large-sized karst cave reservoir body development section is an interval with large-sized karst cave reservoir bodies; (2) establishing a karst zone model in a perpendicular direction, and establishing a palaeogeomorphological unit distribution model on a plane; and (3) simulating the three-dimensional distribution of the large-sized karst cave reservoir bodies in different karst zones and palaeogeomorphological units respectively to obtain a three-dimensional large-sized karst cave reservoir body distribution model of a modeling target stratum. The control effect of a karst development mode on the distribution of the large-sized karst cave reservoir bodies is taken into a full account, the constraints of geological laws are enhanced in a modeling process, and the modeling accuracy of the large-sized karst cave reservoir bodies of carbonate rocks 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 large karst cave reservoirs in 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 beginnin...

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Problems solved by technology

[0005] However, the disadvantages of the above-mentioned existing methods are that they lack the constraints of geological laws in the modeling process, that is, the constraints of reservoir distribution laws, and less consideration is given to the genetic control of karst. Simply using well and seismic data to directly simulate the distribution of reservoirs is often inconsistent with The geological reality is quite different, and its accuracy is not significantly improved compared with the resolution of seismic data, which obviously cannot meet the requirements of fine 3D geological modeling of carbonate fracture-cavity reservoirs

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