Seismic while-drilling technology: use and analysis of the drill-bit seismic source in a cross-hole survey

Aleotti, L.

doi:10.1046/j.1365-2478.1999.00113.x

Cited by 50 publications

(9 citation statements)

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“…The numerical experiment simulates a reverse vertical seismic profile (RVSP), using the drill‐bit as a source. Note that to obtain real‐data RVSP requires an autocorrelation of the drill‐bit data with the pilot signal travelling through the drill‐string (Aleotti et al 1999). The synthetic seismograms are computed with a modelling algorithm based on the velocity–stress formulation of the isotropic‐viscoelastic wave equation.…”

Section: Synthetic Seismograms For Different Pressure Conditionsmentioning

confidence: 99%

The seismic response to overpressure: a modelling study based on laboratory, well and seismic data

Carcione

Tinivella

2001

Geophysical Prospecting

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We investigate the seismic detectability of an overpressured reservoir in the North Sea by computing synthetic seismograms for different pore‐pressure conditions. The modelling procedure requires the construction of a geological model from seismic, well and laboratory data. Seismic inversion and AVO techniques are used to obtain the P‐wave velocity with higher reliability than conventional velocity analysis. From laboratory experiments, we obtain the wave velocities of the reservoir units versus confining and pore pressures. Laboratory experiments yield an estimate of the relationship between wave velocities and effective pressure under in situ conditions. These measurements provide the basis for calibrating the pressure model. Overpressures are caused by different mechanisms. We do not consider processes such as gas generation and diagenesis, which imply changes in phase composition, but focus on the effects of pure pore‐pressure variations. The results indicate that changes in pore pressure can be detected with seismic methods under circumstances such as those of moderately deep North Sea reservoirs.

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Section: Synthetic Seismograms For Different Pressure Conditionsmentioning

confidence: 99%

The seismic response to overpressure: a modelling study based on laboratory, well and seismic data

Carcione

Tinivella

2001

Geophysical Prospecting

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“…Algo que vem ganhando popularidade é a técnica SWD (Seismic While Drilling), a qual se é descida, junto das demais ferramentas, uma fonte sísmica que permite aquisições ao longo da perfuração (PETRONIO e POLETTO, 2002;ALEOTTI et al, 2011). Isso ajuda a solucionar alguns problemas de obtenção de dados com baixa amplitude em decorrência das aquisições muito profundas (MIRANDA et al, 1996;DETHLOFF, CORNISH e DEADY, 2007).…”

Section: Introductionunclassified

Análise De Velocidades De Dados Sísmicos Multicomponente Da Bacia De Santos Utilizando Tecnologia Obn E Técnica SWD

Zuniga

2018

HOLOS

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A sísmica multicomponente apresenta um campo de onda bem mais completo do que a sísmica convencional, em decorrência disso ela vem sendo cada vez mais utilizada nos levantamentos sísmicos. Junto dela, a tecnologia OBN (Ocean Bottom Nodes) é necessária em aquisições marítimas para a obtenção de ondas convertidas. Com o aumento da profundidade dos reservatórios encontrados, existe cada vez mais dificuldade com relação à qualidade dos dados de amplitude obtidos, dessa forma aquisições sísmicas durante a perfuração diminuiriam este problema. Entretanto esse conjunto de técnicas e tecnologias torna o evento sísmico de reflexão muito mais complexo, o que dificulta significativamente a análise de velocidades. Com isso, é necessário utilizar métodos de otimização e análise de velocidades que sejam capazes de controlar as características não-hiperbólicas de um evento de reflexão. Para isso, será utilizada uma equação não-hiperbólica multiparametrica buscando efetuar a análise de velocidades por meio do ajuste entre a curva de tempos de trânsito calculada e observada, tratando como um problema de inversão segundo um critério de otimização. Sendo assim, é possível definir se a sísmica multicomponente traz resultados eficientes quando usada durante a perfuração.

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“…A couple of studies in oil and gas industries have proposed a technique called ''Seismic While Drilling'' for estimating rock formations. For instance, few studies have proposed the use of noise produced by the bit during drilling as a seismic source for surveying the area around a well and also for formation characterization while drilling [5][6][7][8][9][10][11][12][13][14]. A recent study [15] has also reported a method of estimating formation properties by analyzing acoustic waves that are emitted from and received by a bottom hole assembly.…”

Section: Introductionmentioning

confidence: 99%

Estimating rock properties using sound levels produced during drilling

Vardhan

Adhikari²,

Raj

2009

International Journal of Rock Mechanics and Mining Sciences

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Seismic while-drilling technology: use and analysis of the drill-bit seismic source in a cross-hole survey

Cited by 50 publications

References 0 publications

The seismic response to overpressure: a modelling study based on laboratory, well and seismic data

The seismic response to overpressure: a modelling study based on laboratory, well and seismic data

Análise De Velocidades De Dados Sísmicos Multicomponente Da Bacia De Santos Utilizando Tecnologia Obn E Técnica SWD

Estimating rock properties using sound levels produced during drilling

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