Bioclastic limestone reservoir heterogeneity research method

Abstract

The invention provides a bioclastic limestone reservoir heterogeneity research method. The method specifically comprises the following steps that sedimentary microfacies dividing is performed on a bioclastic limestone reservoir; a pore permeability parameter distribution interval standard of different microfacies is built; a region sedimentary facies map is drawn, and the relation between the productivity and sedimentary microfacies belt distribution state of different well locations is inspected; the corresponding relation between main diagenesis types and lithological characters is built through diagenesis type analysis; pore structure research and reservoir classification are performed, and pore diagenetic degree classification grades of different diagenesis types are supplied according to a reservoir classification result; an imitated variable coefficient, an imitated dart coefficient and an imitated range of the bioclastic limestone reservoir are calculated, and numerical intervals of all-grade heterogeneity parameters are supplied. According to the method, the bioclastic limestone reservoir heterogeneity is researched jointly from the macroscopic aspect and microcosmic aspect, and the improvement of the reservoir permeability mechanism knowledge and the guidance of the effective development of oil and gas fields are facilitated.

Description

technical field [0001] The invention relates to a method for studying the heterogeneity of bioclastic limestone reservoirs, in particular to a method for studying the heterogeneity combining geology, well logging and other multi-disciplinary macroscopic and microscopic aspects, belonging to oil and gas exploration and Develop technical fields. Background technique [0002] Reservoir heterogeneity research is an important research content of oil and gas exploration and development, and the degree of reservoir heterogeneity directly restricts the effective development of oil and gas. [0003] Bioclastic limestone reservoirs are generally developed near the margins of carbonate platforms and belong to large-scale marine carbonate deposits, mostly porous bioclastic limestone, with relatively few fractures. Good reservoir physical properties Relatively high porosity (6%-30%), various rock types, including micrite, bioclastic micrite, micrite bioclastic, bioclastic and dolomitic ...

AI Technical Summary

Problems solved by technology

[0006] 1. It is only a single evaluation scale (macro or micro), which is not conducive to the fine understanding of reservoirs

[0007] 2. No effective heterogeneity characterization method has been proposed for special reservoirs such as bioclastic limestone

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