学术报告

报告题目：Hydrothermal dolomite and associated reservoirs in Western Canada Sedimentary Basin: similarity and differences with those from Tarim Basin

报告人：Hairuo Qing 教授

时 间：2018年4月18日（周三）上午10:30

地 点：国家重点实验室A403学术报告厅

报告人单位：University of Regina Regina SK, Canada

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报告内容：

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.

卿海若教授为加拿大里贾纳大学地质学系，前系主任，终身教职，现任加拿大石油地质学杂志主编。1993年1月-1995年10月为加拿大联邦政府地调部研究员，1995年10月- 1998年12月为英国伦敦大学，皇家霍洛威学院地质系讲师，2010年-2012年为加拿大里贾纳大学加籍华人教授协会主席。

卿海若教授将岩石学与地球化学的分析手段相结合，对不同大地构造背景下盆地演化、流体运移与成岩后生变化的关系、对碳酸盐岩储层（尤其是对白云岩）形成机理与模式及其对油气储层的影响进行了深入系统的研究，提出了一系列独到的见解。卿海若教授有关白云化的观点已被总结在世界知名杂志有关白云化进展的综合文章里，并广为引用。卿教授对白云化研究的贡献，尤其是热液白云化的贡献得到了世界同行的认可。卿教授独立或牵头承担25项科研项目，研究经费1240万加圆，包括加拿大国家自然科学基金项目280万加圆；发表论文120篇，其中SCI收录论文80篇；国际会议摘要121篇。曾多次主持重大国际会议。根据谷歌学者2017年2月的统计，卿教授发表论文被引用的次数为2421次；H-指数为26。

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