CSEM performance in light of well results

Hesthammer, Jonny; Stefatos, Aris; Boulaenko, Mikhail; Fanavoll, S.; Danielsen, Jens

doi:10.1190/1.3284051

Cited by 77 publications

(42 citation statements)

References 15 publications

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“…The idea was proposed more than a decade ago , but only recently have there been successful surveys In the past 12 years data has been acquired in basins all around the world and the oil industry is gradually accepting CSEM. Many wells have been drilled, both before and after CSEM surveys and the statistics show that the predicted results are valid (Hesthammer et al 2010;and Buland et al 2011). The main question is: has CSEM been a success?…”

Section: Methods -Where Does Csem Stand Today?mentioning

confidence: 99%

CSEM - Where Do We Stand and Where Can We Go?

Ellingsrud¹

2014

Proceedings

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SUMMARYCSEM was established as an industry 12 years ago by several service companies that offered 2D CSEM commercially. The presentation will focus on how CSEM has developed as a commercial tool since the first commercial introduction 12 years ago and look into the future.The technology has gone through a significant development. The most important step was from 2D to 3D wide azimuth data enabled by improvements in equipment, operations, inversion and streamlined processing of large data volumes. Both horizontal and vertical resistivity cubes are now inverted, enabling mapping of anisotropy and CSEM is no longer limited to deep-water applications.Wide-azimuth 3D surveys will most likely be the main way to acquire CSEM data also in the future. In future processing and inversion, magnetic field data will be used more to improve imaging, especially in shallow water. In general MT data will also be used more which implies stationary seafloor receivers with both electric and magnetic sensors (Ex, Ey, Hx and Hy).CSEM will see deeper (stronger sources), get better resolution and improved data will be processed jointly with seismic, resulting in improved imaging. Moreover, the data will be used as an important part in the oil companies workflow.

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Section: Methods -Where Does Csem Stand Today?mentioning

confidence: 99%

CSEM - Where Do We Stand and Where Can We Go?

Ellingsrud¹

2014

Proceedings

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“…But seismic approaches are not suited to distinguish the nature of the fluid content in the rock (Wright et al, 2002;Wilt & Alumbaugh, 1998). Since water-saturated reservoirs exhibit a low electric resistivity and hydrocarbon-saturated reservoirs a high electric resistivity (Wright et al, 2002;Hesthammer et al, 2010), electromagnetic methods may be able to add the key information in order to determine the pore-fluid of a potential reservoir (Um & Alumbaugh, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…They found, that in 85% of all the cases, the conclusions drawn from an electromagnetic survey were correct. The studies of Hesthammer et al (2010) and Johansen et al (2008) indicate the value of electromagnetic methods to the oil and gas industry and explain the necessity to develop 1. Introduction these methods to a reliable tool.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the wildcat commercial success rate of the oil industry lies at approximately 25% (Hesthammer et al, 2010). Using a database of 86 wells for which electromagnetic data was available, the study by Hesthammer et al (2010) investigates the usefulness of the information from electromagnetic surveys. Among the hydrocarbon bearing wells in their study, 70% showed an electromagnetic anomaly after a very simple processing scheme.…”

Section: Introductionmentioning

confidence: 99%

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Marine controlled-source electromagnetic interferometry

Hunziker¹

2012

Geophysics

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“…The basis of the various controlled-source electromagnetic (CSEM) methods is that their responses are sensitive to the lateral extents and thicknesses of resistive bodies embedded in conductive hosts. Hence, the initial applications have been for de-risking exploration and appraisal projects with direct hydrocarbon indication (Hesthammer et al, 2010). Reservoir surveillance is a logical extension of the CSEM method on the premise of fluid discrimination; in particular, tracking the position of the water contact.…”

Section: Introductionmentioning

confidence: 99%

3D inversion of time‐lapse CSEM data for reservoir surveillance

Black

Wilson

Gribenko

et al. 2010

SEG Technical Program Expanded Abstracts 2010

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SummaryRecent studies have inferred the feasibility of time-lapse controlled-source electromagnetic (CSEM) methods for the surveillance of offshore oil and gas fields. However, quantitative interpretations have not been shown to ascertain what information about the reservoirs that may be recovered. We present a 3D inversion study of synthetic time-lapse CSEM data for the lateral water flooding of a reservoir unit where the hydrocarbon accumulation is trapped by a thin dome structure. We demonstrate that even with few constraints on the model, the flooding front can be recovered from 3D inversion. In this paper, synthetic time-lapse CSEM responses are simulated with the threshold about the noise floor and subject to multiple 3D inversion scenarios. The time-lapse CSEM inverse problem is highly constrained though inherently 3D since the geometry of the reservoir is established prior to production from high resolution seismic surveys; rock and fluid properties are measured from well logs; and multiple history matched production scenarios are contained in dynamic reservoir models.

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CSEM performance in light of well results

Cited by 77 publications

References 15 publications

CSEM - Where Do We Stand and Where Can We Go?

CSEM - Where Do We Stand and Where Can We Go?

Marine controlled-source electromagnetic interferometry

3D inversion of time‐lapse CSEM data for reservoir surveillance

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