學術報告
報告題目：Hydrothermal dolomite and associated reservoirs in Western Canada Sedimentary Basin: similarity and differences with those from Tarim Basin
報告人：Hairuo Qing 教授
時 間：2018年4月18日（周三）上午10:30
地 點：國家重點實驗室A403學術報告廳
報告人單位：University of Regina Regina SK, Canada
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報告內容：
The process of dolomitization and formation of dolomite reservoirs have been a controversial topic for a long time. Since late 80’s, a number of detailed case studies from the Western Canada Sedimentary Basin (WCSB) suggested that hydrothermal fluids played a vital role in formation of massive dolomite and associated reservoirs. In recent years, hydrothermal dolomitization has received so much attention, which has become a new bandwagon that has been applied indiscriminately to some case studies in Tarim Basin in China where the hydrothermal dolomite were, actually, distinctively different from those of WCSB.
The hydrothermal dolomites from the WCSB generally occurred in an open system that delivered Mg as well as heat to the reaction site; whereas most of hydrothermal dolomites in the Tarim Basin occurred in a closed or semi closed system, where Mg is mostly derived via chemical compaction of precursor dolomite. This fundamental difference resulted in a number of unique petrographic and geochemical characteristics of hydrothermal dolomites in two different basins:
(1) he WCSB is characterized by high water/rock ratio of an open system; the Tarim Basin illustrates low water/rock ratio, typically of closed, semi-closed system.
(2) In the WCSB, hydrothermal fluids precipitated large amount of dolomite cement and replaced host precursor limestone; in the Tarim Basin hydrothermal fluids mostly modified earlier dolomites with minor amount dolomite cements.
(3) In the WCSB, the geochemical signatures of hydrothermal dolomite are distinctly different from those of host carbonate rocks; in the Tarim Basin the geochemical signatures of hydrothermal are similar to host carbonate rocks.
(4) In the WCSB, hydrothermal fluids is mostly related to deeply seated fault system and constrained by regional seals; in the Tarim Basin hydrothermal fluids is likely linked to fault systems that were associated with igneous activities.
The fundamental difference of the origin of hydrothermal dolomite from the WCSB and from the Tarim Basin requires a different exploration strategy applied to these two basins. In the WCSB, explorations of hydrothermal dolomite should be focused along regional conduit system along fault and reef chains. In the Tarim Basin, limited amount of hydrothermal dolomite reservoir preferentially occurs along fault systems; and occurrences of hydrocarbon traps require identification of suitable seals for these hydrothermal dolomite reservoirs.
卿海若教授為加拿大里賈納大學地質學系，前系主任，終身教職，現任加拿大石油地質學雜志主編。1993年1月-1995年10月為加拿大聯邦政府地調部研究員，1995年10月- 1998年12月為英國倫敦大學，皇家霍洛威學院地質系講師，2010年-2012年為加拿大里賈納大學加籍華人教授協會主席。
卿海若教授將巖石學與地球化學的分析手段相結合，對不同大地構造背景下盆地演化、流體運移與成巖后生變化的關系、對碳酸鹽巖儲層（尤其是對白云巖）形成機理與模式及其對油氣儲層的影響進行了深入系統的研究，提出了一系列獨到的見解。卿海若教授有關白云化的觀點已被總結在世界知名雜志有關白云化進展的綜合文章里，并廣為引用。卿教授對白云化研究的貢獻，尤其是熱液白云化的貢獻得到了世界同行的認可。卿教授獨立或牽頭承擔25項科研項目，研究經費1240萬加圓，包括加拿大國家自然科學基金項目280萬加圓；發表論文120篇，其中SCI收錄論文80篇；國際會議摘要121篇。曾多次主持重大國際會議。根據谷歌學者2017年2月的統計，卿教授發表論文被引用的次數為2421次；H-指數為26。
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