Method for characterizing shale reservoir capacity based on shale organic matter pore morphology

Abstract

The invention discloses a method for characterizing shale reservoir capacity based on shale organic matter pore morphology. The method comprises the following steps: S1, collecting a shale sample through a rock core or a field profile; S2, cutting the collected sample into a certain specification; S3, performing argon ion polishing on the cut sample, and observing the sample under an environment scanning electron microscope; S4, observing by using an environment scanning electron microscope, randomly selecting 50-100 organic matter pore development areas, and storing; S5, quantitatively characterizing the form of the selected organic matter pores, and characterizing the form of the organic matter pores through a deformation index T; S6, calculating the deformation indexes of all the organic matter pores by using a deformation calculation formula, and calculating the average deformation index T average of the sample; S7, defining a storage capacity; and S8, based on the T average, determining the final reservoir capacity of the shale according to the reservoir capacity characterization interval defined in the S7, so the reservoir capacity of the shale can be simply and rapidly characterized, and the method has good indication significance for the reservoir potential of the shale reservoir.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a method for characterizing shale storage capacity based on shale organic matter pore morphology. Background technique [0002] Shale gas is one of the unconventional oil and gas resources. In order to effectively develop shale gas, it is necessary to evaluate the storage capacity of shale before development to determine the storage capacity of shale, and then to screen out shale gas. Blocks with more gas are developed. [0003] For example, Patent No. 201710061005.9 provides a method for determining shale storage capacity, including: determining the mineral composition content of each sample in at least one sample of shale and the total organic carbon TOC content of each sample; The content of mineral components and the TOC content of each sample determine the storage capacity of the shale. [0004] However, the above method requires many evalua...

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Problems solved by technology

[0004] However, the above method requires many evaluation parameters, and at the same time, it is mainly based on conventional analysis and testing to determine the storage capacity, while the pores of shale reservoirs are mainly microscopic and nanopores, which can only be relatively complete through scanning electron microscopy and other means The characteristics of microscopic and nanopores are observed, so the precision of this technique is relatively low

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