Analysis of the Teal South, Gulf of Mexico, 3D‐4C seismic survey

Rodriguez-Suarez, Carlos; Stewart, Robert R.; Lu, Han-xing

doi:10.1190/1.1815593

Cited by 4 publications

(5 citation statements)

References 4 publications

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“…The ocean-bottom time-lapse data (phases I and II) were acquired and processed with every effort to match the two surveys. The details of survey geometry and processing steps are described in previous studies (Ebrom et al, 1998a;Rodriguez-Suarez et al, 2000;Druzhinin and MacBeth, 2001). The legacy data, however, were acquired using streamer technology and were processed independently of the time-lapse data.…”

Section: Introductionmentioning

confidence: 99%

Imaging of phase changes and fluid movement in and between reservoirs at Teal South

2015

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We have reexamined the poststack seismic legacy and time-lapse data sets from the Teal South field in the Gulf of Mexico for insight into regional pressure changes from production at one reservoir and its effects on neighboring unproduced reservoirs. We support previous predictions of oil and gas leakage from neighboring reservoirs by providing direct evidence for leakage through 3D mapping of the hydrocarbons themselves. The use of the squared instantaneous amplitude as an attribute allowed visualization of the large amplitude changes while minimizing the appearance of noise. The use of translucency in the 3D time-lapse difference volumes assisted in identifying features of interest that had been unrecognized in earlier studies. For example, this investigation found that hydrocarbons appeared to have escaped from one small (unproduced) reservoir through its spill point, only to be trapped in a nearby structure, from which it ultimately escaped through that trap's spill point. Such fluid migration can occur in a period of a few years due to production, not geologic time. Time-lapse studies such as the one presented here can be very helpful in identifying such fluid movement, particularly in highly porous and unconsolidated reservoirs that are highly sensitive to pore-fluid type and stress changes.

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Section: Introductionmentioning

confidence: 99%

Imaging of phase changes and fluid movement in and between reservoirs at Teal South

2015

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“…This test, suggested by Prof. Gary Margrave (personal communication), was to verify a possible explanation to a phenomena sometimes seen in OBC data processing (Ebrom et al (1998);Yuan et al (1998);Li and Yuan (1999); Rodriguez-Suarez et al (2000)): the presence of shear-wave energy in the vertical component while the radial component does not present compressional energy. The presence of S-waves in vertical component is verified applying to vertical data the processing flow (e.g., velocities, receiver statics, etc) used in the radial component.…”

Section: Mode Conversion For Down-and Up-going Wavefieldsmentioning

confidence: 99%

Sea-bottom shear-wave velocities and mode conversions

Rodriguez-Suarez¹

2005

Rev. Bras. Geof.

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ABSTRACT. Elastic parameters for shallow marine sediments were obtained from the literature (Hamilton (1976(Hamilton ( ,1979; Hovem et al. (1991); Esteves (1996)) and previously unpublished geotechnical data from offshore Brazil. The Brazilian data showed reasonable agreement with Hamilton's results except in the very shallow (above 10 m) sedimentary section. A second order equation to calculate VS as a function of depth in marine sediments is derived empirically down to a depth of 140 m.Analyses of transmission and reflection coefficients for compressional-and shear-wave energy mode conversion using Zoeppritz equations were performed for both the sea bottom and a typical hydrocarbon reservoir top of Tertiary age. It is concluded that most S-wave reflection data recorded on the ocean floor by OBC is related to upcoming energy converted at an interface at depth and not from a downgoing shear conversion at the ocean floor.It was also concluded that, using elastic assumptions, mode conversion (both P-to S-and S-to P-) of the up going energy is negligible in the shallow (above 160 m) sediments.Keywords: V S in marine sediments, mode conversion. (1976,1979); Hovem et al. (1991); Esteves (1996)) e dados geotécnicos marítimos inéditos do Brasil. Os dados brasileiros mostraram uma correlação razoável com os resultados de Hamilton exceto para a seção sedimentar muito rasa (acima de 10 m). Uma equação de segunda ordem para calcular V S como função de profundidade foi derivada empiricamente até uma profundidade de 140 m. RESUMO. Parâmetros elásticos para sedimentos marinhos rasos foram obtidos de literatura (HamiltonAnálises de coeficientes de transmissão e reflexão para conversão de modo em ondas compressionais e cisalhantes usando equações de Zoeppritz foram realizadas para o fundo do mar e um topo de reservatório de idade Terciária típico. Conclui-se que a maior parte das ondas-S refletidas e registradas no fundo do mar por cabos de fundo oceânico está relacionadaà energia ascendente convertida em uma interface profunda e não de uma onda-S descendente convertida no fundo do mar.Foi concluído também que, usando premissas elásticas, a conversão de modo (tanto P-para S-quanto S-para P-) da energia ascendenteé negligenciável nos sedimentos rasos (acima de 160 m).Palavras-chave: V S em sedimentos marinhos, conversões de modo.Petrobras / UN-Rio / Atp-Ro / Res,

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“…The Teal South project provided a total of three sets of seismic data, recorded at three different times, representing different reservoir conditions. The ocean-bottom time-lapse data (Phase I and Phase II) were acquired and processed with every effort to match the two survey geometries and processing flows to minimize changes unrelated to production; the details of survey geometry and processing steps are described in previous studies by (Druzhinin and MacBeth (2001), , Rodriguez-Suarez, Stewart, and Lu (2000)). The legacy data, however, were acquired using streamers and were processed independently of the time-lapse data.…”

Section: Northmentioning

confidence: 99%

“…Data for "Phase II" were acquired in April 1999, after almost 30 months of production, with some additional cables deployed to improve imaging for targets deeper than those concerned in the present study. Further details on the Teal South data acquisition and processing can be found in the earlier papers on the subject , Rodriguez-Suarez, Stewart, and Lu (2000), Druzhinin and MacBeth (2001)).…”

Section: Introductionmentioning

confidence: 99%

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Time Lapse Seismic Observations and Effects of Reservoir Compressibility at Teal South Oil Field

Islam¹

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Analysis of the Teal South, Gulf of Mexico, 3D‐4C seismic survey

Cited by 4 publications

References 4 publications

Imaging of phase changes and fluid movement in and between reservoirs at Teal South

Imaging of phase changes and fluid movement in and between reservoirs at Teal South

Sea-bottom shear-wave velocities and mode conversions

Time Lapse Seismic Observations and Effects of Reservoir Compressibility at Teal South Oil Field

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