Shipboard And In-Situ Electrical Resitivity Logging Of Unconsolidated Marine Sediments

Bouma, Arnold H.; Sweet, William E.; Chmelik, Frank B.; Huebner, George L.

doi:10.4043/1351-ms

Cited by 6 publications

(4 citation statements)

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“…The solid curve is the relationship specified by Archie's Law. The fit of the curve to the points is reasonable over the entire range of porosities investigated; a reexamination of representative published data was undertaken to determine if this somewhat surprising adherence to Archie's Law was merely fortuitous [3,[6][7][8][9][10][11][12]. This reexamination confirmed that, although a number of functional relationships between the formation factor and the porosity were derived empirically, Archie's Law provides a reasonable representaion of this relationship for fine-grained material with a porosity exceeding 0.5.…”

Section: Discussionmentioning

confidence: 99%

Seabed geotechnical parameters from electrical conductivity measurements

Hulbert¹,

Bennett

Lambert

1982

Geo-Marine Letters

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Electrical conductivity measurements provide useful geotechnical information, particularly porosity data, and are well suited for use in conjunction with acoustic profiling techniques. A proposed conductivity measurement system for surveying the seabed is characterized by a towed inductive multifrequency probe operating underwater. It is integrated with a shipboard data acquisition and processing system.

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Section: Discussionmentioning

confidence: 99%

Seabed geotechnical parameters from electrical conductivity measurements

Hulbert¹,

Bennett

Lambert

1982

Geo-Marine Letters

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“…Bouma et a( 1971) and Sweet (1972) show several examples about relationships between the core scanner electrical logs and various other parameters, such as lithological variations, sand/clay ratios, water content and bulk density. By utilizing a mode in which the length of the resistance record has the same length scale as the core, the investigator is able to correlate directly resistance changes with anomalies within the core.…”

Section: Core Scannermentioning

confidence: 99%

“…Several contributions dealing with the core scanner and the in situ probe have been published and a-Short review should suffice (Chmelik and Bouma, 1970;Bouma et al, 1971Bouma et al, , 1972Sweet, 1972;Huebner et al, 1973). Preliminary results of the advantages of the towed electrical logging area have been given in Huebner et al (1973), Bouma et al (1973Bouma et al ( ,1974 and Ferebee (1974).…”

Section: Introductionmentioning

confidence: 99%

Electrical Logging Systems and Results of Unconsolidated Marine Sediments

et al. 1975

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The application of electrical logging technology to the study of unconsolidated marine sediments is still in its early stages. Progress in instrumentation development and the results from sea trials indicate the potential for marine logging techniques. Existing electrical logging analytical techniques cannot be extrapolated readily to produce reliable parametric values in unconsolidated marine sediments. Electrical resistance and spontaneous potential measurements made on extruded cores appear to be relatable directly to various geological and geotechnical parameters. These core scanner data also have been checked by absolute resistivity measurements made on small cylindrical samples taken from the same cores. Horizontal correlation of sediment strata over long distances can be conducted rapidly with an in situ electrical logging probe. For-Calibration purposes, measurements should be done on cores via the core scanner. Although a certain comparison with the high resolution seismic profiles exists, the base for the logging parameters differs and is more refined than the acoustical impedance characteristics. The towed array records parametric variations often mastered in complimentary high resolution acoustical subbottom profiling. The measurements are independent of vertical density changes. Additionally, the towed array can be used in water normally too shallow for other techniques. The ability of the towed array to "see" the bottom of oyster reefs makes it possible to estimate the volume of such reefs. Soft, gas-containing, shallow water muds off the Mississippi Delta reveal variations undetectable by seismic means. A survey of Heald Bank showed both major and minor variations in lithology that were in direct agreement with extensive core analyses previously done from that area. INTRODUCTION Within the geological section of the Department of Oceanography of Texas A&M University, emphasis has been placed on the use of electrical resistance(resistivity) and S.P. (spontaneous potential) measurements in unconsolidated marine sediments. Both parameters are measured by electrical scans of extruded cores with an in situ probe and by a towed array that is towed over the bottom behind a vessel. The top few tens of feet of the sea bottom, especially of the continental shelf have been very important to the offshore industry. Offshore structure anchoring, pipelines, and cables depend heavily on the properties of these upper sediments, while incorporation of waste material on the marine mining of minerals primarily deal with the upper parts of the deposits. The large marine industries concerned with cables, offshore installations, dredging or pollution, all require accurate and detailed information on the properties, structures and distribution of the upper sediments. No one technique can provide answers to all these questions and thus a combination type of approach is required. The high costs of marine work warrant continuous research to develop additional systems that either replace existing techniques or are complimentary to these techniques. The aim is always directed to better and more information and at the same time a reduction in costs. Time-reducing systems, such as the "Hi-Resolve System" therefore should receive proper attention (Chmelik et al., 1972; Huebner et al., 1973).

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“…Focussed electrical resistivity measurements have been used for many years in conjunction with the more conventional borehole resistivity techniques (Doll 1951,1953, Cambefort 1957, Schlumberger 1969 for the assessment of the porosity and oil bearing capacity of reservoir rocks (Archie 1942, 1950, Doll, Sauvage and Martin 1952. More recently focussed electrical measurements have been used as a means of estimating the in situ porosity of marine sediments (Bouma, Sweet, Chmelik and Huebner 1971, Kermabon 1972, Erchul and Nacci 1972, Jackson 1975, Jackson, Smith and Stanford 1978, Beckman and Deminray 1976 and for the detection of coal seams (Samworth and Cherrie 1976).…”

Section: Introductionmentioning

confidence: 99%

Focussed Electrical Resistivity Arrays: Some Theoretical and Practical Experiments*

Jackson

1981

Geophysical Prospecting

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JACKSON, P.D. 1981, Focussed Electrical Resistivity Arrays: Some Theoretical and Practical Experiments, Geophysical Prospecting 29,601-626.The " Laterolog 7 " and the " Microlaterolog " have been studied theoretically for the case of a conducting halfspace containing a single overburden, using a technique based on the method of images. The results have shown these focussed arrays to be more sensitive to the lower medium (i.e., having greater depth of investigation) than unfocussed ones of the same dimensions, when the "correct" geometric factor is used. The geometric factor of a focussed

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Shipboard And In-Situ Electrical Resitivity Logging Of Unconsolidated Marine Sediments

Cited by 6 publications

References 0 publications

Seabed geotechnical parameters from electrical conductivity measurements

Seabed geotechnical parameters from electrical conductivity measurements

Electrical Logging Systems and Results of Unconsolidated Marine Sediments

Focussed Electrical Resistivity Arrays: Some Theoretical and Practical Experiments*

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