US 11,927,094 B2
Comprehensive geological-engineering classification evaluation method for low-permeability reservoirs
Jian Xiong, Sichuan (CN); Xiangjun Liu, Sichuan (CN); Lixi Liang, Sichuan (CN); Yi Ding, Sichuan (CN); Linlin Huang, Sichuan (CN); Lianlang Hou, Sichuan (CN); Shiqiong Liu, Sichuan (CN); and Hongqi Liu, Sichuan (CN)
Assigned to Southwest Petroleum University, Sichuan (CN)
Filed by Southwest Petroleum University, Sichuan (CN)
Filed on Dec. 14, 2021, as Appl. No. 17/551,164.
Claims priority of application No. 202011466585.8 (CN), filed on Dec. 14, 2020.
Prior Publication US 2022/0106876 A1, Apr. 7, 2022
Int. Cl. E21B 49/00 (2006.01); G01V 99/00 (2009.01); G06F 30/28 (2020.01); E21B 43/26 (2006.01); G06F 113/08 (2020.01)
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
OG exemplary drawing
 
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.