Seismic processing for time-lapse study: Genesis Field, Gulf of Mexico

Magesan, M.; Depagne, Sylvere; Regel, Bernard; Opich, John; Rogers, G.T.; Hudson, Thomas

doi:10.1190/1.1901384

Cited by 18 publications

(6 citation statements)

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“…For pore-filling clay, Marion et al (1992) propose a model ( Figure 18) in which porosity of the rock initially decreases (and velocity increases) as small amounts of clay fill the pore spaces. For pore-filling clay, Marion et al (1992) propose a model ( Figure 18) in which porosity of the rock initially decreases (and velocity increases) as small amounts of clay fill the pore spaces.…”

Section: Lithology Porosity and Clay Contentmentioning

confidence: 99%

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Practical Applications of Time-lapse Seismic Data

Johnston

2013

127

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Section: Lithology Porosity and Clay Contentmentioning

confidence: 99%

“…As illustrated in Figure 19, for an open-pore system, P f is, on average, simply the hydrostatic pressure head -about 0.45 psi/ft (10 kPa/m) for brine. After Marion et al (1992). Where we have hydrocarbons, the fluid Figure 18.…”

Section: Pressure Changes and The Rock Frameworkmentioning

confidence: 99%

Practical Applications of Time-lapse Seismic Data

Johnston

2013

127

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“…(referred to as cross‐equalization), is typically applied to field data prior to time‐shift estimation (Rickett and Lumley ; ; Magnesan et al . ).…”

Section: Theoretical Backgroundmentioning

confidence: 97%

Inversion of multicomponent seismic time shifts for reservoir pressure and length: a feasibility study

Smith

Tsvankin

2015

Geophysical Prospecting

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A B S T R A C TPressure drops associated with reservoir production generate excess stress and strain that cause travel-time shifts of reflected waves. Here, we invert time shifts of P-, S-, and PS-waves measured between baseline and monitor surveys for pressure reduction and reservoir length. The inversion results can be used to estimate compaction-induced stress and strain changes around the reservoir. We implement a hybrid inversion algorithm that incorporates elements of gradient, global/genetic, and nearest neighbour methods and permits exploration of the parameter space while simultaneously following local misfit gradients. Our synthetic examples indicate that optimal estimates of reservoir pressure from P-wave data can be obtained using the reflections from the reservoir top. For S-waves, time shifts from the top of the reservoir can be accurately inverted for pressure if the noise level is low. However, if noise contamination is significant, it is preferable to use S-wave data (or combined shifts of all three modes) from reflectors beneath the reservoir. Joint wave type inversions demonstrate improvements over any single pure mode. Reservoir length can be estimated using the time shifts of any mode from the reservoir top or deeper reflectors. We also evaluate the differences between the actual strain field and those corresponding to the best-case inversion results obtained using P-and S-wave data. Another series of tests addresses the inversion of the time shifts for the pressure drops in two-compartment reservoirs, as well as for the associated strain field. Numerical testing shows that a potentially serious source of error in the inversion is a distortion in the strain-sensitivity coefficients, which govern the magnitude of stiffness changes. This feasibility study suggests which wave types and reflector locations may provide the most accurate estimates of reservoir parameters from compaction-induced time shifts.

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“…Coprocessing was described by Magesan et al (2005). Optimum timing, acquisition and processing parameters, and potential value were addressed The project team recommended that a proprietary, monitor survey be acquired that replicated the baseline survey as closely as possible and that both surveys be co-processed to minimize differences.…”

Section: D Seismic Projectmentioning

confidence: 99%

Preliminary Results of the Genesis Field Time-Lapse-Seismic Project, Gulf of Mexico

Hudson

Regel

Bretches

et al. 2006

Offshore Technology Conference

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractA seismic survey was acquired over the Genesis Field in the deepwater Gulf of Mexico in October, 2002, 33 months after first production, for the purposes of reservoir monitoring and field management. The 1991 baseline survey was coprocessed with the 2002 monitor survey to minimize differences between the surveys except those related to production. Interpretation of the resulting seismic reflection and acoustic impedance (AI) volumes indicate that the 4D project will add significant value to the field.The 4D data have been interpreted for the field's five primary reservoir sands revealing production-related, timelapse anomalies including an increase in travel time of up to 10 ms at the top of the producing interval due to reservoir compaction and overburden dilation and changes in reflection strength due to fluid movement and pressure reduction. Updip potential was recognized and/or geological risk for remaining reserves reduced in three reservoirs and connectivity uncertainties in several reservoirs were resolved, leading to better understanding and modeling of reservoir behavior.Initial value of the 4D project has been indicated by the elimination of one anticipated sidetrack, saving over $10 million. Another sidetrack had its geological risk reduced and estimates of recoverable reserves increased. Several future sidetracks should be affected similarly. Updates to the geological model with corresponding adjustments to the reservoir simulation should lead to better well placement, better recovery estimates, and improved reservoir management.

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Seismic processing for time-lapse study: Genesis Field, Gulf of Mexico

Cited by 18 publications

References 0 publications

Practical Applications of Time-lapse Seismic Data

Practical Applications of Time-lapse Seismic Data

Inversion of multicomponent seismic time shifts for reservoir pressure and length: a feasibility study

Preliminary Results of the Genesis Field Time-Lapse-Seismic Project, Gulf of Mexico

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