Associating Borehole Radar Imaging with Petrophysical Properties for a Mud-Contaminated Reservoir

Feng Zhou, Iraklis Giannakis, Antonios Giannopoulos, Evert Slob

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

28 Downloads (Pure)

Abstract

In the phase of oil drilling, mud filtrate penetrates into porous formations and alters the pore fluid properties. This complicates well logging exploration, and inevitably gives rise to shift in reservoir estimation. Logging engineers deem mud invasion a harm and attempt to eliminate its impact on logging data exploration. However, from our point of view, the mudcontaminated parts of the formation do also carry some valuable information, notably with regard to the key hydraulic properties. Therefore, if adequately characterized, mud invasion effects, in turn, could be utilized for reservoir estimation. Typically, the invasion depth critically depends on 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 by coupling electromagnetic (EM) modelling with fluid flow modelling in an oil-bearing formation disturbed by mud invasion effects. The simulations imply that a time-lapse radar logging is able to extract EM reflection signals from mud invasion front, and the invasion depth and EM velocity can be obtained by a downhole antenna displacement 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. The study demonstrates a potential method of oil reservoir estimation and a novel application of GPR in oil fields
Original languageEnglish
Title of host publicationNear Surface Geoscience Conference & Exhibition 2019
Subtitle of host publication8-12 September 2019, The Hague, Netherlands
PublisherEAGE
Number of pages7
DOIs
Publication statusPublished - 2019
Event10th International Workshop on Advanced Ground Penetrating Radar - The Hague, Netherlands
Duration: 8 Sep 201912 Sep 2019
https://prod.eage.org/sitecore/content/events/home/2019/iwagpr?sc_lang=en

Workshop

Workshop10th International Workshop on Advanced Ground Penetrating Radar
CountryNetherlands
CityThe Hague
Period8/09/1912/09/19
Internet address

Keywords

  • borehole radar
  • reservoir estimation
  • mud invasion

Fingerprint Dive into the research topics of 'Associating Borehole Radar Imaging with Petrophysical Properties for a Mud-Contaminated Reservoir'. Together they form a unique fingerprint.

Cite this