Depositional Environment of Sands Beneath the Mid-Miocene Unconformity in the Plamuk-L and Surat-C Field Areas, Gulf of Thailand, Using Cuttings Identification, Well Log and Seismic Interpretation
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Abstract
The sub-MMU sand in the Plamuk-L and Surat-C areas is a blocky, extensive thick sand (40-60 ft thick), deposited below the MMU and within the Upper Red Bed unit (Sequence IV), which was deposited under more oxic-conditions during exposure in a marine regression. This sand shows 23% - 34% porosity and 8% - 11% clay volume, which qualifies it as a good quality potential reservoir. Regional sand features interpreted from seismic amplitude map show pocket-like shapes, aligned along a tortuous trend in a northeast – southwest direction. This distribution indicates variations that are likely tied to deposition as channel point-bars. The studied sand is filled with oil and gas in wells drilled into closed structures (SUWC-32 and 33), while hydrocarbons are absent in areas of non-closure.
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Copyright © 2008 Department of Geology, Faculty of Science, Chulalongkorn University. Parts of an article can be photocopied or reproduced without prior written permission from the author(s), but due acknowledgments should be stated or cited accordingly.
References
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