CO2与砂岩相互作用机理与形成的自生矿物组合

摘要/Abstract

摘要： 当CO₂以天然方式或人工方式注入到含水砂岩时,成岩流体将转变成弱酸性流体,引起宿主砂岩中不稳定矿物(如碳酸盐、长石)的分解和新矿物的沉淀,进而使砂岩的孔隙度、渗透率和地层水地球化学特征发生改变。CO₂注入砂岩后,仅有少量CO₂溶解于水中以气体形式存在,大部分CO₂以次生矿物形式(如方解石、白云石、菱铁矿等)被“固化”在宿主砂岩中,形成的典型自生矿物组合为:片钠铝石±含铁碳酸盐矿物±其它碳酸盐矿物组合和铁白云石+高岭石+自生石英组合。其中,前一种矿物组合是示踪CO₂运移、聚集的典型自生矿物组合。CO₂与砂岩相互作用机理及形成的自生矿物组合研究不仅拓宽了沉积盆地中流体-岩石相互作用研究领域,揭示了深部流体与浅部储集层之间、浅部烃源岩或其它岩石与附近储集层之间的物质转移,而且为储集砂岩品质评价、CO₂气藏(田)预测、CO₂地下储存等研究提供了基础地质信息。

关键词: CO₂, 砂岩, 作用, 机理, 自生矿物

Abstract: When CO₂ is injected into aquifer sandstone by natural or manual mode, diagenetic fluid will become weak acidic fluid, resulting in the decomposition of unstable minerals such as carbonate and feldspar and the precipitation of new minerals in host sandstone as well as the variation of sandstone porosity and permeability and formation water geochemical characteristics. Moreover, only a small amount of CO₂ dissolves in water as a form of gas, while most of it is solidified in the host sandstone in forms of secondary minerals like calcite, dolomite and siderite, etc. The typical authigenic mineral assemblages include the dawsonite ±ferruginous carbonate ±other carbonate and the ankerite + kaolinite + authigenic quartz ones, in which the former is a typical authigenic mineral assemblage to trace CO₂ migration and accumulation. This study on mechanism of CO₂-sandstone interaction and formative authigenic mineral assemblage not only broadens the field of fluid-rock interaction in sedimentary basins, reveals the mass transportation between deep fluid and upper reservoir or between shallow source rock (or other rocks) and adjacent reservoir rocks, but also provides basic geologic information for the researches of sandstone reservoir quality evaluation, CO₂ gas pool (or field) prediction and CO₂ subsurface storage.

Key words: CO₂, sandstone, interaction, mechanism, authigenic minerals

中图分类号:

P571
P618.13

高玉巧, 刘立, 曲希玉. CO₂与砂岩相互作用机理与形成的自生矿物组合[J]. 新疆石油地质, 2007, 28(5): 579-584.

GAO Yu-qiao, LIU Li, QU Xi-yu. Mechanism of CO₂-Sandstone Interaction and Formative Authigenic Mineral Assemblage[J]. Xinjiang Petroleum Geology, 2007, 28(5): 579-584.

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CO₂与砂岩相互作用机理与形成的自生矿物组合

Mechanism of CO₂-Sandstone Interaction and Formative Authigenic Mineral Assemblage

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