P-wave fracture prediction algorithm using pre-stack data with limited azimuth distribution: A case study in the TZ45 area, Tarim Basin, China

Sun, Sam Zandong; Wang, Zhaoming; Yang, Haijun; Xiao, Xi; Wang, Yueying; Chen, Lei; Yang, Peng

doi:10.1007/s12182-011-0160-y

Cited by 16 publications

(2 citation statements)

References 13 publications

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“…Push assembly consists of executive unit, piston with nozzles and ribs pushing the wall. Different pushing force acting on the hole is based on the flow and pressure of drilling fluid [7,8] .…”

Section: Automated Strap-down Vertical Drilling Systemmentioning

confidence: 99%

Field Test of Automated Strap-Down Vertical Drilling System in Well Anshun-1

Zhao

Zhang

2014

AMM

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Automated strap-down vertical drilling system (AVDS) with independent intellectual property rights is composed of a strap-down stabilization platform and a deviation control and correction mechanism. It performs deviation control and correction initiatively while drilling by applying dynamic push-lean, which can effectively solve the inclination control and fast drilling problems arising from high-steep structures and high dip formations. The system can release drilling pressure completely, so under the precondition of ensuring inclination precision, it could remarkably improve the penetration rate, shorten the drilling cycle and reduce the drilling costs. During the field test from 2436 to 2610.79m in well Anshun-1, inclination angle decreased to 0.25° from 6.25°. The average ROP was 1.02m/h, and the average footage was 87.4m. Compared with traditional drilling tools, it improved the penetration rate by 25.9% and the footage by 18.3%. The stability and reliability of the system was proved through the field test. It was suggested that field tests should be strengthened and AVDS applying for different borehole should be developed.

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Section: Automated Strap-down Vertical Drilling Systemmentioning

confidence: 99%

Field Test of Automated Strap-Down Vertical Drilling System in Well Anshun-1

Zhao

Zhang

2014

AMM

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“…During the transition for azimuthally anisotropic processing, commonoffset-vector migration (Cary, 1999) and azimuth-sectored migration (Zheng and Gray, 2002) were proposed to take azimuth information into consideration. Azimuth-sectored migration is still widely applied in current practice for analyzing azimuthal anisotropy and detecting fractures (Sun et al, 2011(Sun et al, , 2012b(Sun et al, , 2012cPeng et al, 2013). Because those methods are performed on only small offset-azimuth bins of premigrated data, the resultant images and gathers always suffer from a low S/N.…”

Section: Introductionmentioning

confidence: 99%

Full-azimuth anisotropic prestack time migration in the local-angle domain and its applications on fracture detection

Sun

2015

GEOPHYSICS

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Considering that geologic structures disturb prestack amplitude relationships, anisotropic migration is thus advocated not only for extracting azimuth-preserved common image gathers (CIGs), but also for preserving fracture-induced amplitude responses. However, most conventional anisotropic migration methods are hindered by their inefficiency in either modeling azimuthal traveltime variations at large offsets or characterizing subsurface reflections. Given that prestack time migration is widely applied for most practical purposes, we began with reformulations on a quartic traveltime formula, through which a new set of anisotropic parameters was developed. Then, an anisotropic migration method was established in the localangle domain (LAD) for more reasonable uses of subsurface wavefield information. We also used a traveltime inversion scheme to estimate those anisotropic parameters required by anisotropic migration. Using this methodology on a physical model with a fracture medium, we derived better focused CIGs by thoroughly correcting the anisotropic effects of overburden. As a result, predicted properties of the fracture medium showed fewer interventions of geologic impacts. In a field example, a comprehensive study was performed on a deep carbonate reservoir to examine influences of different anisotropic migration algorithms on ultimate fracture prediction. Comparisons of the signal-to-noise ratio and agreements with formation microimage information reconfirmed the superiority of LAD anisotropic migration in recovering true properties of subsurface fractures, relative to routine methods (i.e., azimuth-sectored migration and anisotropic migration in the surface-offset domain).

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