| 幔源CO_2释出机理、脱气模式及成藏机制研究进展 |
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| 引用本文： | 鲁雪松,宋岩,柳少波,洪峰,付晓飞.幔源CO_2释出机理、脱气模式及成藏机制研究进展[J].地学前缘,2008,15(6):293. |
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| 作者姓名： | 鲁雪松 宋岩 柳少波 洪峰 付晓飞 |
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| 基金项目： | 中国石油天然气股份有限公司重大科技专项"吉林油田高含CO2天然气开发和CO2埋存及资源综合利用研究"
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| 摘 要： | 针对幔源CO2如何从地幔岩浆中脱出并进入沉积地层中形成CO2气藏聚集这一关键问题,总结了国内外研究进展和前缘方向。研究表明,地幔深部的碱性玄武岩浆和碱性岩浆才是深部流体和CO2等挥发份大量赋存、渗滤和释出的场所。浅成侵入岩、次火山岩和火山通道等是CO2释放和聚集的有利位置,岩浆期后和岩浆衰弱期的热液活动阶段是CO2大量释放和聚集的有利时期。幔源CO2进入沉积盆地中具有3种脱气模式,即沿岩石圈断裂直接脱气模式、热流底辟体脱气模式和壳内岩浆房-基底断裂组合脱气模式。CO2的固有物化性质决定其运移相态多样,具有运移和聚集过程同步的特征。只有在满足大量的化学消耗及地层水或原油的溶解和耗散之后才能形成CO2有效聚集。幔源CO2成藏和分布主要受岩浆气源体和气源断裂体系的控制。今后,在超临界CO2及其对油气运移聚集的作用、CO2与深大断裂及火山岩的关系、CO2脱气运移机制、CO与常规烃类油气的耦合差异成藏机制等方面仍需要进一步的研究和探索。
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| 关 键 词： | 地幔深部流体 CO_2气藏 岩浆房 深大断裂 脱气模式 成藏机制 |
Progress in the studies of mantle-derived CO2 degassing mechanism, degassing model and pool-forming mechanism |
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| Lu Xuesong,Song Yan,Liu Shaobo,Hong Feng,Fu Xiaofei.Progress in the studies of mantle-derived CO2 degassing mechanism, degassing model and pool-forming mechanism[J].Earth Science Frontiers,2008,15(6):293. |
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| Authors: | Lu Xuesong Song Yan Liu Shaobo Hong Feng Fu Xiaofei |
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| Abstract: | In this paper,we have reviewed the recent progress in the studies of the key problems that how was the mantle-derived CO2 degassed from mantle magma and how did it migrate into sedimentary formations forming CO2 gas accumulations,and have pointed out the frontier problems in the related research area.These studies indicate that only alkaline basalt magma and alkaline magma are the medium and channel in which deep fluids and volatile components including CO2 are massively lodged,filtered and discharged.Shallow intrusive rocks,sub-volcanic rocks and volcanic conduits are the favorable positions for CO2 degassing and accumulation.Hydrothermal activity in post magmatic and magma declining period are the favorable stages for massive CO2 degassing and accumulation.Mantle-derived CO2 migrated into basins with three types of degassing model,including the model of inorganic gas directly overflowing through lithosphere faults,heat flow piercement degassing model,and degassing model of crustal magma chamber combined with basement faults.The intrinsic physicochemical properties of CO2 determine its various migration phases,and the synchronous migration and accumulation process.Only after massive chemical consuming and dissolution by formation water or oil can CO2 form effective accumulation.Pool formation and distribution of mantle-derived CO2 are mainly controlled by magma gas-source bodies and gas-source fault systems.In future,further research and exploration need to be taken on some frontier issues,such as supercritical CO2 and its function on petroleum migration and accumulation,the relationship between CO2 and deep-large faults and volcanic rocks,CO2 degassing and migration pattern,and the coupled but different pool-forming mechanism between CO2 and normal hydrocarbon. |
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| Keywords: | deep fluids in mantle CO_2 gas pool magma chamber deep-large fault degassing model pool-forming mechanism |
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