Method for identifying millimeter-level bedding seam of shale reservoir in in-situ state

Abstract

The invention discloses a method for identifying a millimeter-level bedding seam of a shale reservoir in an in-situ state and relates to the technical field of shale gas exploration. The method comprises the following steps of S1, scanning and imaging a core column through FMI equipment, and determining the position of a lithology or special mineral marker bed on the core column; S2, performing depth matching on the FMI imaging logging diagram and the rock core, and determining a corresponding relation between the rock core and the FMI imaging logging diagram; S3, matching the corresponding relation between the bedding seam and the imaging logging diagram characteristics, and meanwhile, starting from the imaging logging diagram, researching the correlation between a common logging method and the bedding seam; and S4, interpreting the bedding seam of the well in the research area by using the bedding seam recognition template obtained in the S3. According to the method, the rock core in the in-situ state is directly scanned through the FMI equipment, the bedding seam is quickly recognized based on the template for recognizing the bedding seam, parameters such as the bedding seam density are obtained, and problems that an existing bedding seam recognition method is low in accuracy, and the rock core bedding seam in the in-situ state is difficult to recognize are solved.

Description

technical field [0001] The invention belongs to the technical field of shale gas exploration, in particular to a method for identifying millimeter-level bedding fractures of shale reservoirs in an in-situ state. Background technique [0002] Shale bedding fractures are important channels for shale oil and gas accumulation and seepage. At present, the identification of bedding fractures mainly relies on descriptive methods: wetting outcrops or cores, and manually counting the number of streaks on shale. It is also proposed to use the number of bubbles in the water immersion test and the mineral composition of shale to measure the bedding fracture density in the underground state in situ, or to estimate the fracture density in the in situ condition of the formation based on the relationship between the bedding fracture density and lithofacies on the core. [0003] The problems existing in the existing bedding fracture identification methods are as follows: first, the temperatu...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for identifying millimeter-scale bedding fractures in shale reservoirs in the in-situ state, directly scan the core in the in-situ state through FMI equipment, and quickly identify the bedding based on the template for identifying bedding fractures The bedding fracture density and other parameters are obtained, which solves the problem that the existing bedding fracture identification method has low accuracy and it is difficult to identify the core bedding fracture in the in-situ state

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