中国石油大学学报（自然科学版）2018，Vol.42Issue(3)：57-63,7.DOI:10.3969/j.issn.1673-5005.2018.03.007
基于反射声波测井有限元方法的井旁裂缝分布特征
Near wellbore fracture distribution characteristics based on acoustic reflection logging finite element method
摘要
Abstract
Based on the theory of acoustic wave propagation,reflected wave characteristics are studied by the finite element method in the presence of well fracture. 2D axial symmetry finite element modeling is applied on one side of discontinuous a-coustic impedance. The models to computing cross fracture reflection interface and arc fracture reflection interface are estab-lished for the cases where cross fracture and arc fracture exist on the side of well. Waveform data from the same source re-ceived by the different receivers are processed and the parameters (e.g., reflection phase arrival time) are obtained. The distribution character of wellbore fracture in shale reservoir is obtained accordingly. The results show that the variations in the arrival time of the reflected wave owing to the changes in the vertical coordinates of sound source is consistent with the shape of the wellbore fracture. In the presence of a cross shaped fracture near the wellbore, inclination angles of the side fracture obtained using the arrival time of reflected wave are 10.13 degrees and 20.19 degrees, respectively, which are within 1.31% and 0.95% of the analytical model. In the case of an arc shaped fracture near the wellbore,the location and shape feature of the wellbore fracture can be effectively derived by the coordinates of the reflecting interface. The relative error be-tween the central position of fracture and the coordinate of reference point is within 1.70%.It is concluded that the acoustic finite element method can effectively infer the position and morphology of fracture near the wellbore.关键词
页岩储层/声波测井/声波有限元/裂缝分布/裂缝反射界面Key words
shale reservoir/acoustic logging/acoustic finite element/fracture distribution/fracture reflection interface分类
能源科技引用本文复制引用
闫怡飞,赵云,宋胜利,暴喜涛,周晓奇,赵垒,闫相祯..基于反射声波测井有限元方法的井旁裂缝分布特征[J].中国石油大学学报（自然科学版）,2018,42(3):57-63,7.基金项目
中国博士后科学基金项目(2017M612375) （2017M612375）
中央高校基本科研业务费专项(18CX02154A) （18CX02154A）
国家自然科学基金项目(51374228) （51374228）
国家科技重大专项(2016ZX05017-003) （2016ZX05017-003）
