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作者Gong, Shou-Yeh;Mii, H.S;Wu, M.S.;Lin, A.A.
出版日期2010
著作名稱Hydrocarbon derived carbonate cementation in subsurface environment in the Vulcan Sub-Basin, Timor Sea
刊名Terrestrial, Atmospheric and Oceanic Sciences
21
頁數923-937
被收錄索引SCI
主題地質
關鍵字Authigenic carbonate; Subsurface cementation; Hydrocarbon; Vulcan Sub-basin; Timor Sea
摘要Localized carbonate cementation occurs in the Eocene Grebe Sandstone of the Vulcan Sub-basin, Timor Sea, Australia. The cements have been previously interpreted as originating from microbial methane oxidation and sulfate reduction in a shallow subsurface environment and were related to hydrocarbon leakage. Here we reassess these localized carbonate cements in the Grebe Sandstone, and reported new findings. Petrography shows that there are two facies of sands in the Grebe Sandstone: (1) cemented, mostly fine-grained sands; and (2) loose, often coarse-grained sands. In addition, two types of carbonate matrix occur in the Grebe Sandstone: (1) spars to microspars in calcareous, fine-grained sandstones; and (2) micritic to microsparry matrix associated with limestone grains. Stable carbon isotopic values reveal that only the cements associated with sandstones were probably hydrocarbon-derived, and the resultant mineral is mainly calcite. Petrographic attributes and Mn+2 and Co+2 compositions of these cements differ significantly from those of modern cold-seep carbonates at or near the sea floor. Moreover, the hydrocarbon-derived carbonate mineralization only occurs in the fine-grained sands, not in the coarse-grained sands. In other word, the cementation was not only dependent on hydrocarbon leakage but also on the lithofacies of the host rock. We propose that the extent of hydrocarbon-related cementation alone cannot be used to evaluate the trap integrity as has been previously suggested
資料連結Full Text
DOIdoi: 10.3319/TAO.2010.01.14.01(TT)
系統號NO000005036

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