In Situ Measurement of Electrical Resistivity of Ocean Sediments Containing Gas Hydrates

Abstract:

An understanding of the physical properties of hydrate-bearing sediment is necessary for interpretation of geophysical data collected in field settings. We have conducted a laboratory experiment to measure the electrical property of initially water saturated sediment containing natural gas hydrate. When gas hydrate was formed from pore fluid in ocean sediment, bulk sediment resistivity was significantly increased. The resistivity of the sediment was largely changed below 20% hydrate saturation. With the increasing hydrate saturation, the resistivity of sediment was increased and the resistivity of pore fluid was decrease. In the final process of hydrate formation, the resistivity depression was found mainly due to the transition of gas hydrate morphology. The electrical resistivity of hydrate specimens varied from 1.930 Ohm.m to 3.950 Ohm.m for saturation ranging from 0% to 52.68%. Besides, the dependence of the resistivity index versus hydrate saturation is inconsistent with Archies law. The results of our studies have important implications for quantitative laboratory and field calibration of geophysical measurements within gas hydratebearing intervals.

• Periodical: Applied Mechanics and Materials (Volume 432)
• Pages: 104-108
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.432.104
• Online since: September 2013
• Authors: Yu Feng Chen, De Qing Liang, Neng You Wu
• Keywords: Electrical Resistivity, Gas Hydrate, Hydrate Saturation, Sediment

References

[1] Makogon, Y F: Hydrates of hydrocarbons (Tulsa, Oklahoma, Penn well Publishing Company).

[2] Collett, T S. Energy Resource Potential of Natural Gas Hydrates. AAPG Bulletin, 86(11), (2002), 1971-(1992).

[3] Kvenvolden, K A. Methane hydrate - a major reservoir of carbon in the shallow geosphere?. Chemical Geology, 71, (1988), 41-51.

DOI: 10.1016/0009-2541(88)90104-0

[4] Gunn, D A, L M Nelder, C A Rochelle et, al. Towards improved ground models for slope instability evaluations through better characterization of sediment-hosted gas-hydrates. Terra Nova, 14, (2002), 6, 443-451.

DOI: 10.1046/j.1365-3121.2002.00451.x

[5] Collett, T S. Natural gas hydrates of the Prudhoe Bay and Kuparuk River area, North Slope, Alaska. AAPG Bulletin, 77 (5), (1993), 793-812.

DOI: 10.1306/bdff8d62-1718-11d7-8645000102c1865d

[6] Collett, T S. Well log evaluation of natural gas hydrates (Denver, Colorado, U.S., Geological Survey, 1992).

[7] Hyndman, R D, T Yuan, and K Moran. The concentration of deep sea gas hydrates from downhole electrical resistivity logs and laboratory data, Earth Planet. Sci. Lett., 172 (1-2), (1999), 167-177.

DOI: 10.1016/s0012-821x(99)00192-2

[8] Collett, T S, and J Ladd. Detection of gas hydrate with downhole logs and assessment of gas hydrate Concentrations (saturations) and gas volumes on the Blake ridge with electrical resistivity Log data, In Paull, C.K., Matsumoto, R., Wallace, P. J, et al eds. Proceedings of the Ocean Drilling Program, Scientific Results, 164, (2000).

DOI: 10.2973/odp.proc.sr.164.219.2000

[9] Riedel, M, P Long, C S. Liu, P Schultheiss, T Collett, and ODP Leg 204 Shipboard Scientific Party. Physical properties of nearsurface sediments at southern Hydrate Ridge: results from ODP Leg 204. In Tréhu, A.M., Bohrmann, G., Torres, M.E., and Colwell, F.S. (Eds. ), Proc. ODP, Sci. Results, 204, (2006).

DOI: 10.2973/odp.proc.sr.204.104.2006

[10] Lu J, S X Yang, N Y Wu. Well Logging Evaluation of Gas Hydrates in Shenhu Area, South China Sea: Geoscience, 22(3), (2008), 447-451.

[11] Pearson, C F, P M Halleck, P L McGuire, R Hermes, and M Mathews. Natural gas hydrate deposits: a review of in situ properties: The Journal of Physical Chemistry, 87(21), 1983, 4180-4185.

DOI: 10.1021/j100244a041

[12] Santamarina, J C, F Francisca, T S Yun, et al. Mechanical, thermal, and electrical properties of hydrate-bearing sediments, Vancouver, Canada: AAPG HEDBERG CONFERENCE, (2004).

[13] Gabitto, J F and C Tsouris. Physical Properties of Gas Hydrates: A Review: Journal of Thermodynamics, 2010, (2010), 1-12.

DOI: 10.1155/2010/271291

[14] Pearson, C, J Murphy, P Halleck, R Hermes and M Mathews. Sonic and resistivity measurements on Berea sandstone containing tetrahydrofuran hydrates: a possible analogue to natural-gas-hydrate deposits, Fairbanks, Alaska: Proceedings of the 4th International Conference on Permafrost, (1983).

DOI: 10.1029/jb091ib14p14132

[15] Antiopy Tzirita, A study of electrical and thermal properties and their use to detect natural gas hydrates in ocean sediments: Texas, Texas A&M University, (1992).

[16] Spangenberg, E and J Kulenkampff. Influence of methane hydrate content on electrical sediment properties: Geophysical Research Letters, 33, (2006), 1-5.

DOI: 10.1029/2006gl028188

[17] Chen Y F, D L li, D Q Liang: submitted to Acta Petrolei Sinica (2012).