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Pre-drilling risk assessment using seismic diffraction information in fractured formations
Liang Yao1; Huo ShouDong2; Li XueLiang2; Shu MengCheng3; Yang Xiao4; Shi TaiKun4
AbstractPre-drilling risk assessment is important to reduce lost circulation and well collapse in the process of intelligent drilling guidance. While drilling in fractured formations, especially in deep and ultra deep areas, the pressure bearing capacity of the wellbore is frequently affected by the natural fracture zone in the formation, which is prone to drilling accidents such as lost circulation and well collapse. Diffraction wave is an effective method to describe natural fracture zones, benefit from its sensitivity to small geological bodies such as fractures. However, the current diffraction seismic imaging results usually have low signal-to-noise ratio which is difficult to be directly applied to pre drilling risk assessment. By analyzing the amplitude energy of root mean square of diffraction data, this paper develops a structural smoothing technology suitable for diffraction imaging, and proposes a description method of natural fracture zone based on diffraction data, which can describe the spatial distribution of natural fracture zone with higher signal to noise ratio. The method has been applied in a drilling in deep fractured formation in Shunbei area. The predicted results of the target interval have a good corresponding relationship with the leakage and sticking of the actual drilling, which verifies the effectiveness of the method.
KeywordPre-drilling risk assessment Fractured zone Seismic diffraction Gradient structural tensor
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000910572800004
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Document Type期刊论文
Corresponding AuthorHuo ShouDong
Affiliation1.Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Nat Resources, Beijing 100037, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
3.China Univ Petr, Beijing 102200, Peoples R China
4.Geol Survey & Digital Earth Beijing Technol Co Lt, Beijing 100096, Peoples R China
Corresponding Author AffilicationKey Laboratory of Petroleum Resource Research, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Liang Yao,Huo ShouDong,Li XueLiang,et al. Pre-drilling risk assessment using seismic diffraction information in fractured formations[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2023,66(1):46-53.
APA Liang Yao,Huo ShouDong,Li XueLiang,Shu MengCheng,Yang Xiao,&Shi TaiKun.(2023).Pre-drilling risk assessment using seismic diffraction information in fractured formations.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,66(1),46-53.
MLA Liang Yao,et al."Pre-drilling risk assessment using seismic diffraction information in fractured formations".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 66.1(2023):46-53.
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