Shale heterogeneity classification and comparative method

Abstract

The invention discloses a shale heterogeneity classification and comparative method, which comprises:(1) building the isochronous stratigraphic comparison lattice for the vertical heterogeneity classification of the shale reservoir by the high-frequency sequence classification and comparation; (2) studying the macro heterogeneity in the isochronous stratigraphic comparison lattice and analyzing and establishing the vertical and horizontal change characteristics of the macro heterogeneity of different high-frequency sequences of the shale reservoir in the isochronous stratigraphic comparison lattice; (3) studying the micro heterogeneity in the isochronous stratigraphic comparison lattice and establishing the vertical and horizontal change characteristics of the micro heterogeneity of different high-frequency sequences of the shale reservoir; (4) classifying and comparing small layers, and conducting detailed classification of small layers in the isochronous stratigraphic comparison lattice according to the heterogeneity characteristics of the shale reservoir in research results of the macro heterogeneity and the micro heterogeneity. The method selects the shale reservoir with high heterogeneity both in vertical and lateral directions as stable and continuous output selecting layer and provides geological basis for shale gas' exploiting vertical selecting layer, plane division and development technique policy in the future.

Description

technical field [0001] The invention relates to shale gas development technology, in particular to a shale heterogeneity division and comparison method. Background technique [0002] The two-year development practice of the Wufeng-Longmaxi Formation shale gas reservoir in the Jiaoshiba block of the Fuling shale gas field has proved that the gas-bearing shale section has different production capacities in different layers in the vertical direction and in different blocks on the plane. Studies have confirmed that the vertical and horizontal heterogeneity of shale reservoirs is the main reason for this vertical and horizontal productivity difference. [0003] The traditional view is that shale has strong homogeneity, but no systematic research has been carried out on the heterogeneity of shale reservoirs. Whether the heterogeneity of shale reservoirs is critical to the productivity of gas-bearing shale gas reservoirs It is not clear that those important key parameters of shale...

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Problems solved by technology

[0003] The traditional view is that shale has strong homogeneity, but no systematic research has been carried out on the heterogeneity of shale reservoirs. Whether the heterogeneity of shale reservoirs is critical to the productivity of gas-bearing shale gas reservoirs Only those important key parameters of shale reservoirs will have a significant impact on the single-well productivity of shale gas wells in the later stage, which is not yet clear. The method of dividing and comparing the heterogeneity of shale reservoirs has not yet been established. A series of These problems have hindered the division of shale gas development strata and development areas

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