Potential applications of time-lapse CSEM to reservoir monitoring

Salako, Olarinre; MacBeth, Colin; MacGregor, Lucy

doi:10.3997/1365-2397.2014025

Cited by 9 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However pore pressure inflation creates a slowdown that could counteract this saturation effect (see details in the next section). If water injection is into the aquifer, this leads to elevated pressure and little or no water saturation change (4D seismic changes due to the salinity variation are known to be small – Salako, MacBeth and MacGregor ). Pore pressure inflation from this mechanism gives rise to a slowdown with no competing saturation effect – see Fig.…”

Section: The Magnitude Of 4d Seismic Time‐shiftsmentioning

confidence: 99%

Review Paper: Post‐stack 4D seismic time‐shifts: Interpretation and evaluation

MacBeth

Mangriotis

Amini

2018

Geophysical Prospecting

View full text Add to dashboard Cite

A review and analysis of post‐stack time‐lapse time‐shifts has been carried out that covers published literature supplemented by in‐house datasets available to the authors. Time‐shift data are classified into those originating from geomechanical effects and those due to fluid saturation changes. From these data, conclusions are drawn regarding the effectiveness of post‐stack time‐shifts for overburden and reservoir monitoring purposes. A variety of field examples are shown that display the range and magnitude of variation for each class of application. The underlying physical mechanisms creating these time‐shifts are then described, and linked to a series of generic and field‐specific rock physics calculations that predict their magnitudes. These calculations serve as a guide for practitioners wishing to utilize this information on their own datasets. Conclusions are drawn regarding the reliability of this attribute for monitoring purposes, and the extent to which further development is required and how it should be reported by authors.

show abstract

Section: The Magnitude Of 4d Seismic Time‐shiftsmentioning

confidence: 99%

Review Paper: Post‐stack 4D seismic time‐shifts: Interpretation and evaluation

MacBeth

Mangriotis

Amini

2018

Geophysical Prospecting

View full text Add to dashboard Cite

show abstract

“…Reservoir monitoring and surveillance are the new frontier for the CSEM method [10,11]. Several synthetic studies have shown the CSEM time-lapse sensitivity in order to solve for resistivity changes associated with fluid substitution [12][13][14][15][16]. However, to date, only one 4D survey has been reported in the literature [17].…”

Section: Introductionmentioning

confidence: 99%

Time-Lapse CSEM Monitoring: Correlating the Anomalous Transverse Resistance with SoPhiH Maps

Menezes

Correa²,

Alvim³

et al. 2021

Energies

View full text Add to dashboard Cite

The CSEM method, which is frequently used as a risk-reduction tool in hydrocarbon exploration, is finally moving to a new frontier: reservoir monitoring and surveillance. In the present work, we present a CSEM time-lapse interpretation workflow. One essential aspect of our workflow is the demonstration of the linear relationship between the anomalous transverse resistance, an attribute extracted from CSEM data inversion, and the SoPhiH attribute, which is estimated from fluid-flow simulators. Consequently, it is possible to reliably estimate SoPhiH maps from CSEM time-lapse surveys using such a relationship. We demonstrate our workflow’s effectiveness in the mature Marlim oilfield by simulating the CSEM time-lapse response after 30 and 40 years of seawater injection and detecting the remaining sweet spots in the reservoir. The Marlim reservoirs are analogous to several turbidite reservoirs worldwide, which can also be appraised with the proposed workflow. The prediction of SoPhiH maps by using CSEM data inversion can significantly improve reservoir time-lapse characterization.

show abstract

“…The transverse resistance values are fairly similar but not identical. These results illustrate the ambiguity of the inversion together with the conclusions of Salako et al (2015) that the best resolved parameter in CSEM is an estimate of bulk electrical resistivity for the reservoir.…”

Section: D Inversionmentioning

confidence: 61%

A land-based controlled-source electromagnetic method for oil field exploration: An example from the Schoonebeek oil field

et al. 2018

View full text Add to dashboard Cite

Controlled-source electromagnetic (CSEM) data are sensitive to the subsurface resistivity distribution, but 3D inversion results are ambiguous, and in-depth interpretation is challenging. Resolution and sensitivity analysis as well as the influence of noise on resolution have been used to quantify 3D inversion performance. Based on these numerical studies, a land-based CSEM survey was designed and carried out at the Schoonebeek oil field, the Netherlands. The acquired data were processed and subsequently inverted for the resistivity distribution. The 1D and 3D inversion of horizontal electric-field data show the reservoir at the right depth, matching well-log data without using a priori knowledge about the actual reservoir depth. We used a 1D model with fine layering as a starting model for 3D inversion. Synthetic data inversions and sensitivity tests demonstrate that resistive or conductive bodies inside the reservoir zone may be well-detectable with our limited acquisition geometry. Spatial variations in the reservoir resistivity are visible in the measured data and after inversion by assuming good knowledge of the background resistivity distribution. The reservoir resistivity and size, however, have to be interpreted with care considering the intrinsically low resolution of electromagnetic (EM) which is further reduced by manmade EM noise.

show abstract

Potential applications of time-lapse CSEM to reservoir monitoring

Abstract: Water injection Basic principles Water injection is the oldest and most commonly used secondary oil recovery method, whether onshore or offshore,

Cited by 9 publications

References 21 publications

Review Paper: Post‐stack 4D seismic time‐shifts: Interpretation and evaluation

Review Paper: Post‐stack 4D seismic time‐shifts: Interpretation and evaluation

Time-Lapse CSEM Monitoring: Correlating the Anomalous Transverse Resistance with SoPhiH Maps

A land-based controlled-source electromagnetic method for oil field exploration: An example from the Schoonebeek oil field

Contact Info

Product

Resources

About