CPC E21B 49/00 (2013.01) [G01V 99/00 (2013.01); G06F 30/28 (2020.01); E21B 43/26 (2013.01); E21B 2200/20 (2020.05); G06F 2113/08 (2020.01)] | 6 Claims |
1. A comprehensive geological-engineering classification evaluation method for low-permeability reservoirs, comprising steps of:
constructing geological classification evaluation indexes of a reservoir: adopting gray correlation method to obtain main controlling factors of reservoir geology of the low-permeability reservoirs that affects fracturing effects; based on the main controlling factors of the reservoir geology, constructing the geological classification evaluation indexes of low-permeability reservoirs by principal component analysis;
constructing engineering classification evaluation indexes of the reservoir: adopting gray correlation method to obtain main controlling factors of geomechanics of the low-permeability reservoirs that affects fracturing effects; based on the main controlling factors of geomechanics, constructing the engineering classification evaluation indexes of low-permeability reservoirs by an analytic hierarchy process; and
according to classification limit values of the geological classification evaluation indexes of a reservoir and engineering classification evaluation indexes of a reservoir, achieving comprehensive geological-engineering classification of reservoir types;
wherein the step of constructing geological classification evaluation indexes of a reservoir comprising:
S1: by the grey correlation analysis method, calculating a correlation degree between reservoir geological factors and rice production index to obtain the main controlling factors of the reservoir geology
S2: by the principal component analysis, constructing the geological classification evaluation indicators of low-permeability reservoirs.
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