Seismic Data

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Petroleum Geo-Services (PGS), in conjunction with the Cambodian National Petroleum Authority (CNPA), is pleased to announce the availability of two recently acquired MultiClient 2D Seismic Surveys providing modern regional datasets.

Natasha Hendrick of PGS published a paper at ASEG 2009 (Australian Society of Exploration Geophysicists) titled 'MINIMAL-IMPACT SEISMIC ACQUISITION: SUCCESSFUL IMAGING USING AN ACCELERATED WEIGHT DROP SYSTEM'
Link to download paper (PDF 1,214kb)

Onshore

TSKS-07 MC2D

Acquisition using a modern accelerated weight drop crew equipped with over 1,000 channels of Sercel 408 commenced in January 2008 in the virgin Tonle Sap Basin and the onshore portion of the Kompong Som Basin. The survey has a scope of up to 1,800 km as shown on the indicative program map below and with processed data available from September 2008 the dataset will help potential bidders evaluate currently available onshore blocks. For those companies already in advanced negotiations, this data will be invaluable in rapidly assessing and progressing block work programs.

The MultiClient terms and broad scope will enable oil companies to access data across block boundaries thus providing better understanding of the regional geological development.

Link to Onshore Seismic Survey

Onshore TSKS-07 seismic examples

Offshore

CAM-07 MC2D

1,748 line kilometers were acquired using a 6km streamer towed by the S/V Zephyr. The seismic program covering offshore Blocks B, C, D and E provides an advanced knowledge to the area adjacent to the keenly awaited future Cambodia/Thailand Joint Development Area (CTJDA). The survey provides a unique opportunity to gain insight into one of the few remaining unexplored areas in the region surrounded by proven petroleum systems.

Geological Overview

The offshore Cambodia area occupies a position of moderate structural complexity with a main basinal area known as the Khmer Trough/Basin. The regional Tertiary tectonic history has been heavily influenced by the effects of the collision between the Eurasian and Indian plates. This has resulted in a conjugate set of strike-slip faults and the development of the north-south extensional zones that formed the numerous north-south trending basins. Faulting in and around the Khmer Basin is more complicated and extensive than in the Thai Pattani Basin area to the west. However, the north-south trend still predominates, resulting in a series of ridges separating narrow, fault bounded basin areas. The Khmer Basin is approximately 9200 m deep at the depocenter.

The oldest Tertiary sedimentary rocks above the basement penetrated by wells offshore Cambodia are Late Eocene in age. The stratigraphy of the Cambodia offshore area, based on well and seismic data, includes rocks from Pre-Tertiary to Pleistocene age. The Khmer Basin has been filled with predominantly fluvio-lacustrine to shallow marine sedimentary deposits, with relatively minor, locally developed volcanics.

Three main unconformities are present in the basin. The first is of late Cretaceous to possibly mid-Tertiary age and separates the pre-Rift phase (Basement) from early Syn-Rift phase. The second, of "mid-Oligocene" age, separates the early Syn-Rift phase from late Syn-Rift phase. The third unconformity, of late Middle Miocene age, separates the late Syn-Rift phase from the post-Rift phase.

The main plays in the Khmer Basin are channels and stacked channel sandstones lying adjacent to faults in the Miocene and Oligocene sequences. Source rocks are expected to exist at several stratigraphic levels, however the best source rock for the area is the late Oligocene - earliest Miocene organically rich, lacustrine mudstones.

There is also a Pre Tertiary basin in the eastern part of the survey area (see line example) with unknown age and petroleum potential.

Link to Offshore Seismic Survey