Time-Lapse Logging, A Valuable Reservoir Evaluation Technique

Murphy, Robert P.; Owens, W.W.

doi:10.2118/578-pa

Cited by 8 publications

(4 citation statements)

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“…We thus can propose to utilize a time-lapse logging matter to extract the reflection signals from the invasion front. Time-lapse logging has proved to be effective for extract the information of the changed portions of the background, especially applied to fluid flow monitoring [19]. We implement time-lapse radar logging operations in the invasion of 24 and 26 hours, and obtain the time-lapse radar profiles.…”

Section: Results and Discussmentioning

confidence: 99%

Associating borehole radar logging data with petrophysical properties in a mud-contaminated reservoir: Can we converse disadvantage to advantage?

Zhou¹,

Giannakis

Giannopoulos

et al. 2019

10th International Workshop on Advanced Ground Penetrating Radar

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Logging engineers deem mud invasion a harm and attempt to eliminate its impact on logging data. However, from our point of view, the mud-contaminated parts of the formation do also carry some valuable information, notably with regard to the key hydraulic properties. Therefore, if adequately characterized, the invasion effects, in turn, could be utilized for reservoir estimation. Typically, the invasion depth critically depends of the formation porosity and permeability. To achieve this objective, we propose to use borehole radar to determine the mud invasion depth considering a high spatial resolution of ground-penetrating radar (GPR) compared with the conventional logging tools. We implement numerical investigations on the feasibility of this approach. The simulations imply that a timelapse radar logging is able to extract EM reflection signals from mud invasion front, and the invasion depth and EM velocity can be estimated by the downhole measurement of one source and two receivers. We find that there exists a positive correlation between the estimated invasion depth and permeability curves, and a negative correlation between the estimated velocity and porosity curves. We suggest that borehole radar has potential to estimate permeability and porosity of oil reservoirs, wherein the mud invasion effect is positively utilized.

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Section: Results and Discussmentioning

confidence: 99%

Associating borehole radar logging data with petrophysical properties in a mud-contaminated reservoir: Can we converse disadvantage to advantage?

Zhou¹,

Giannakis

Giannopoulos

et al. 2019

10th International Workshop on Advanced Ground Penetrating Radar

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show abstract

“…Therefore, we propose to perform time-lapse logging measurements to extract the reflected signals from the transition zone. Time-lapse logging has proven to be effective for extracting information with regard to changes in the rock physical properties especially when applied to fluid flow monitoring (Murphy and Owens, 1964). Miorali et al…”

Section: Fluid Distributions and Radar Responsesmentioning

confidence: 99%

Estimating reservoir permeability with borehole radar

et al. 2020

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In oil drilling, mud filtrate penetrates into porous formations and alters the compositions and properties of the pore fluids. This disturbs the logging signals and brings errors to reservoir evaluation. Drilling and logging engineers therefore deem mud invasion as undesired and attempt to eliminate its adverse effects. However, the mud-contaminated formation carries valuable information, notably with regard to its hydraulic properties. Typically, the invasion depth critically depends on the formation porosity and permeability. Therefore, if adequately characterized, mud invasion effects could be used for reservoir evaluation. To pursue this objective, we have applied borehole radar to measure mud invasion depth considering its high radial spatial resolution compared with conventional logging tools, which then allows us to estimate the reservoir permeability based on the acquired invasion depth. We investigate the feasibility of this strategy numerically through coupled electromagnetic and fluid modeling in an oil-bearing layer drilled using freshwater-based mud. Time-lapse logging is simulated to extract the signals reflected from the invasion front, and a dual-offset downhole antenna mode enables time-to-depth conversion to determine the invasion depth. Based on drilling, coring, and logging data, a quantitative interpretation chart is established, mapping the porosity, permeability, and initial water saturation into the invasion depth. The estimated permeability is in a good agreement with the actual formation permeability. Our results therefore suggest that borehole radar has significant potential to estimate permeability through mud invasion effects.

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“…The logging tool response detects the information around the borehole, and the mud invasion has unavoidable impacts on the logging reading, especially for the conventional logging method with shallow DOI, such as density logging, neutron logging, shallow electrical logging, etc. Murphy pointed out that time-lapse logging which the logging record run in the different period could be used to analyze the change of formation fluid [1]. Gondouin carried out experiment about water saturation change with resistivity logging [2].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Mud Invasion Profile Based on the Well Logging with the Shallow Depth of Investigation

Zhang

Miao

2012

AMR

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The drilling mud invasion is a dynamic process varying with time and reveal the permeability or the relatively permeability of the formation saturated with fluid. The mud invasion profile denotes the water saturation change with the radial distance from the borehole wall. The logging with the shallow depth of investigation (DOI), such as density logging, neutron logging and shallow electrical logging, often detects the information of the flushed zone. We chose DOI logging to model the slope invasion profile with the hyperbolic secant function, and the calculated logging reading comparing from the real logging reading to optimize the invasion profile. The results show that the mud invasion profile and the invasion depth are strongly affected by porosity, where the invasion depth reduces with porosity adding.

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Time-Lapse Logging, A Valuable Reservoir Evaluation Technique

Cited by 8 publications

References 0 publications

Associating borehole radar logging data with petrophysical properties in a mud-contaminated reservoir: Can we converse disadvantage to advantage?

Associating borehole radar logging data with petrophysical properties in a mud-contaminated reservoir: Can we converse disadvantage to advantage?

Estimating reservoir permeability with borehole radar

Numerical Modeling of Mud Invasion Profile Based on the Well Logging with the Shallow Depth of Investigation

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