Using converted-wave seismic data for lithology discrimination in a complex fluvial setting: Tenerife oil field, Middle Magdalena Valley, Colombia

Abstract

The Middle Magdalena Basin is an actively producing region in Colombia, which in recent years has been chosen for development by means of water and steam flooding. However, complex stratigraphy has challenged the development of a detailed reservoir static model. The Tenerife 3C-3D experimental survey was conducted in 2009 as an integrated application (from acquisition design to interpretation) of multicomponent technology to differentiate lithology (sand and clay) in a Colombian field. The Tenerife 3C-3D survey was twice as expensive as conventional surveys in the same region, so a requirement was to evaluate its added value. The acquisition design resulted in a 22.3 km2 survey with a trace density of 480,000 traces/km2. After careful processing, the PP and PS data were jointly inverted for elastic properties. Even though density is the best discriminator for clay volume in this area, it was not possible to obtain a reliable estimate. Density log data were unavailable for all Tenerife wells, and shear sonic was available for only one well. However, it was possible to derive sand and shale probability volumes using the output elastic attributes from PP and PS joint inversion.

Análise comparativa de aproximações não-hiperbólicas dos tempos de trânsito de dados sísmicos multicomponente utilizando tecnologia OBN

“…Thus, it was possible to identify the most appropriate approximations for each model tested, for each kind of reflection event, and for all situations studied here in a general form. (Pickett, 1963, Stewart et al, 2002, Agudelo et al, 2013, obter-se seções sísmicas de reflexão mesmo com refletividade fraca de onda P (Garrota, 1999, Stewart et al, 2002, 2003, a obtenção de uma melhor resolução dos dados sísmicos (Stewart et al, 2003;Meier et al, 2009, Ursenbach et al, 2013, melhorar o imageamento de falhas de alto ângulo (Purnell, 1992, Stewart et al, 2003, Wang et al, 2014, imagear através de nuvens de gás (Granli el al. 1995), discriminar fluidos como água e óleo em reservatórios fraturados (Qian et al, 2007), monitorar mais detalhadamente as mudanças em reservatórios de hidrocarboneto com a utilização de sísmica 4D (Spitz et al, 2000), dentre vários outros benefícios.…”

Nonhyperbolic multiparametric travel-time approximation for converted-wave and OBN data

“…Multi-component seismic data have shown themselves extremely important for improving the subsurface characterization, because they contain more complete information about the elastic wave field than single-component data. The use of multicomponent seismic provides many enhancementssuch as the determination of Vp/Vs ratio to mapping the lithological variation (Pickett, 1963, Stewart et al, 2002, Agudelo et al, 2013, the possibility of obtaining the seismic sections even with a weak P reflectivity (Pickett, 1963, Stewart et al, 2002, Agudelo et al, 2013, the possibility of a better resolution of the seismic image (Stewart et al, 2003;Meier andLee, 2009, Ursenbach et al, 2013), a better imaging of high angle faults (Purnell, 1992, Stewart et al, 2003, Wang et al, 2014, a better imaging through gas cloud (Granli el al. 1995), a better fluid discrimination (Qian et al, 2007), and monitoring the variations of the 4D seismic (Spitz et al, 2000).…”