Fissure-cave type carbonate-reservoir reservoir body modeling method

Abstract

The invention provides a fissure-cave type carbonate-reservoir reservoir body modeling method, and belongs to the field of carbonate reservoir exploitation geology. The method comprises the steps of (1) distinguishing karst cave reservoir body development segment in a single well; (2) building karst zone models along the vertical direction, building ancient landform unit distribution models in a plane; (3) respectively imitating three-dimensional distribution of the karst cave reservoir body in different karst zones and different ancient landform units, obtaining a three-dimensional distribution model of the karst cave reservoir body of a modeling target stratum; (4) counting development occurrence of a fissure reservoir body and single-well fissure development density; and (5) under control of a fault, building a three-dimensional discrete distribution model of the fissure reservoir body. According to the fissure-cave type carbonate-reservoir reservoir body modeling method, accuracy of the class of reservoir modeling is improved, a true condition of the reservoir is approached in a more objective mode, and important practical significance is provided for exploitation of the reservoir.

Description

technical field [0001] The invention belongs to the geological field of carbonate oil reservoir development, and in particular relates to a modeling method for fracture-cavity carbonate oil reservoir bodies. 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] The existing mature modeling methods are mainly aimed at clastic rock reservoirs of conventional sedimentary origin, and are not suitable for fracture-cave carbonate reservoirs with caves and fractures as storage spaces. At present, there are few researches on the modeling of this kind of reservoir body, domestic related researches started at the beginning of this century, such as [1] Wang Genjiu, Wang Guihong, Yu Guoyi, et al., Tahe Carbonate Reservoir Geological Model [J], Petroleum Exploration and Developm...

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Problems solved by technology

[0005] However, most of the above-mentioned existing methods use well seismic data to directly simulate the distribution of reservoirs. The disadvantage is that the modeling process lacks the constraints of geological laws, that is, the constraints of the distribution of reservoirs, and does not take into account the formation of karstification in fractured-vuggy reservoirs. The karst-cavern reservoir space and the fracture-type reservoir space formed by tectonic movements are different in origin and distribution, and the established models are often quite different from the geological reality, and their accuracy is not significantly improved compared with the resolution of seismic data. Obviously, it cannot meet the requirements of fine 3D geological modeling of carbonate fracture-cavity reservoirs

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