Continental facies fracture-cavity type reservoir stratum identification method

Abstract

The invention belongs to the field of oil-gas exploration and exploitation and provides a continental facies fracture-cavity type reservoir stratum identification method. The method comprises the following steps: rock core information and logging information of a cored well of a drilled fracture-cavity type reservoir stratum in an object zone are collected, and a development position of the fracture-cavity type reservoir stratum of the cored well can be determined according to the rock core information; according to how a logging curve of the cored well is sensitive to fracture-cavity type reservoir stratum characterization, logging curve data is selected; a logging identification standard for the fracture-cavity type reservoir stratum in the object zone is established; the established logging identification standard for the fracture-cavity type reservoir stratum in the object zone is used for identifying the fracture-cavity type reservoir stratum in the object zone. The continental facies fracture-cavity type reservoir stratum identification method can be used for effectively identifying the fracture-cavity type reservoir stratum via conventional logging data; costs of well drilling, coring and imaging logging can be reduced in subsequent exploration and exploitation processes; exploration and exploitation costs can be lowered; improvement of oil-gas exploration and exploitation proceeds can be guaranteed.

Description

technical field [0001] The invention belongs to the field of oil and gas exploration and development, and provides a method for identifying continental fracture-cavity reservoirs. Background technique [0002] Fracture-vuggy reservoirs are oil and gas reservoirs of fractures, fissures, pores, caves, etc., which are generally developed in carbonate rock formations. The reservoirs have rapid lithology changes, strong heterogeneity, and irregular spatial distribution of fractures and caves features. Continental fractured-vuggy reservoirs in my country are developed in continental lacustrine basins, with complex lithology and small volume of fractured caves. Taking continental fractured-vuggy reservoirs in the Baiyinchagan Sag of Erlian Basin in my country as an example, the diameter of fractured caves is generally smaller than 1 cm, conventional well logging identification is difficult and difficult to effectively identify. [0003] At present, core observation and imaging log...

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Problems solved by technology

The above two methods require a large investment, which pushes up the exploration cost, and it is difficult to meet the needs of efficient exploration and development of continental fracture-vuggy reservoirs

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