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7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006
1 SRAK, Khobar, 31952, Saudi Arabia, phone: 00966-895-8880, fax: 00966-895-8801, [email protected]
2 Geophyscial Operations Dept, SRAK, P. O. Box 20801, Khobar, 31952, Saudi Arabia
Magneto telluric
South Rub Al-Khali Company Ltd. (SRAK) carried out magnetotelluric (MT) and TDEM (time-domain electromagnetic)
survey in the Rub Al-Khali desert. 116 full tensor MT data
were acquired using up to ten 24-bit GPS–synchronised 5
channel Metronix ADU-06 recording units including a fixed remote reference MT station. Time series were processed using
robust remote referencing. TDEM
data
were acquired at each station using the Sirotem Mk3 system.
This presentation will cover:
The acquisition problems associated with the high resistivity in the sand dunes resulting in poor quality MT data
while the
data
collected in the inter dune areas resulted in very good quality.
The modifications of recording equipment to overcome the data
quality issues related to resistivity in sand dunes.
The interpretation
of the MT
data
collected between the dunes using 1- and 3-D inversion techniques.
Seismic
Spectroscopy using amplified 3C Geophones
A seismic
spectroscopy experiment, using amplified high-sensitivity (HSG) 3C geophones (“low frequency acquisition” or
“LF acquisition”) was carried out in SRAK's contract area 2 in the Saudi Arabian Rub al-Khali desert. The experiment was
designed to assess whether such a technique can be used as a DHI. While initial indications for a DHI are rather weak, a
number of interesting observations have been made, including a weak relation between one of SRAK's prospects and some
spectral features in the low frequency noise spectrum.
In this presentation we will describe the modified instrumentation, the field implementation and the processing of the LF
data
as well as briefly review the
interpretation
of the
data
and integration with
seismic
and potential field
data
.