Establishment method for fracture-cave distribution diagram of fracture-cave carbonate reservoir, model and application

Abstract

The invention provides an establishment method for a fracture-cave distribution diagram of a fracture-cave carbonate reservoir, a model and an application. The method comprises the following steps ofbased on a built geological model of a target well group region, marking fractures, karst caves and underground rivers, and obtaining a three-dimensional profile structure diagram of the geological model of the target well group region; based on the three-dimensional profile structure diagram, performing layered display on the geological model, and selecting a most representative path between wells of the target well group region to perform two-dimensional cutting connection on the wells, thereby obtaining a two-dimensional profile diagram between the wells; based on the two-dimensional profile diagram, delineating regions of the karst caves and the underground rivers, taking a whole of the delineated closed region as the karst cave region, and obtaining a two-dimensional profile fracture-cave structure depiction diagram; and restoring middle-scale fractures around large-scale fractures in the two-dimensional profile fracture-cave structure depiction diagram, so as to obtain the fracture-cave distribution diagram of the fracture-cave carbonate reservoir.

Description

technical field [0001] The invention relates to the field of petroleum exploration, in particular, the invention relates to a method for establishing fracture distribution diagrams of fracture-cavity carbonate rock reservoirs, a model and an application thereof. Background technique [0002] The main factor for the formation of effective oil and gas reservoirs in carbonate reservoirs under the unconformity is weathering crust karstification. Karstification makes the karst landform and dissolution fracture-cavity system of the reservoir more complicated, and also leads to the formation of carbonate rocks. The structure is different, and under the action of hydrodynamic force, the development of karst in the vertical and plane is uneven. Reasonable vertical division of karst reservoirs is an important measure to realize the effective development of carbonate reservoirs. According to the strength of karst fracture-cavity system development, groundwater movement mode, and karst...

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Problems solved by technology

Moreover, most of the karst caves in the model are regular circular holes, and the fractures are designed as straight lines, which are different from the actual reservoir geological structure, resulting in the inability to truly reflect the real reservoir fluid flow process, and the research results are poor in guiding

Fractured-cavity carbonate reservoirs have complex development characteristics, large scale differences, and serious heterogeneity. Therefore, the existing models are not well consistent with the actual reservoir geological and production characteristics, and the research results lack universality.

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