Dissolution-filling mechanism of atmospheric precipitation controlled by both thermodynamics and kinetics
Dissolution-filling mechanism of atmospheric precipitation controlled by both thermodynamics and kinetics
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热力学和动力学控制的大气降水溶解充填机制
DOI：
10.1007/s11430-013-4711-5
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发表时间：
2013-10
期刊：
影响因子：
--
通讯作者：
JIN ZhiJun
中科院分区：
文献类型：
--
作者：
MENG QingQiang;ZHU DongYa;HU WenXuan;JIN ZhiJun
受构造抬升影响，塔里木盆地奥陶系碳酸盐岩多次遭受大气降水的溶蚀改造，形成了大量的溶洞作为油气藏。但塔河地区钻探表明，许多大型溶洞、小孔隙和裂缝被方解石充填，导致储层能力下降。溶洞中充填的方解石具有很轻的氧同位素组成和87Sr/86Sr比值。其δ18OPDB范围为-21.2‰～13.3‰，平均值为-16.3‰；87Sr/86Sr比值范围为0.709561～0.710070，平均值为0.709843。同位素组成表明方解石与大气降水有关。理论分析表明，降水对碳酸盐岩的溶解充填作用受到热力学和动力学机制的双重控制。其中，热力学因素决定了降水从地表向下流动过程中，对碳酸盐岩从溶解到饱和、进一步沉积、最后充填起着重要作用。也就是说，岩溶作用发育的深度并不是不受限制的，而是受到地表以下降水量的限制。另一方面，动力因素控制着岩溶作用发育的强度、深度和广度，即岩溶作用还受到地形、地貌、气候因素、断裂或断裂程度等因素的影响。因此，在它们的共同作用下，奥陶系碳酸盐岩降水的岩溶作用只发生在不整合面以下一定深度（大多在200 m左右），即碳酸盐矿物开始沉积充填的深度以内。以前形成的溶洞。
Affected by structural uplift, the Ordovician carbonate rockbed in the Tarim Basin, China, was exposed to dissolution and reformation of atmospheric precipitation many times, and formed a large quantity of karst caves serving as hydrocarbon reservoir. However, drilling in Tahe area showed that many large karst caves, small pores and fractures are filled by calcite, resulting in decrease in their reservoir ability. Calcite filled in the karst caves has very light oxygen isotopic composition and87Sr/86Sr ratio. Itsδ18OPDBranges from −21.2‰ to 13.3‰with the average of −16.3‰ and its87Sr/86Sr ratio ranges from 0.709561 to 0.710070 with the average of 0.709843. The isotope composition showed that calcite is related to atmospheric precipitation. Theoretic analyses indicated that the dissolving and filling actions of the precipitation on carbonate rocks are controlled by both thermodynamic and kinetic mechanisms. Among them, the thermodynamic factor determines that the precipitation during its flow from the earth surface downward plays important roles on carbonate rocks from dissolution to saturation, further sedimentation, and finally filling. In other words, the depth of the karstification development is not unrestricted, but limited by the precipitation beneath the earth surface. On the other hand, the kinetic factor controls the intensity, depth, and breadth of the karstification development, that is, the karstification is also affected by topographic, geomorphologic, climatic factors, the degree of fracture or fault, etc. Therefore, subject to their joint effects, the karstification of the precipitation on the Ordovician carbonate rocks occurs only within a certain depth (most about 200 m) under the unconformity surface, deeper than which carbonate minerals begin to sedimentate and fill the karst caves that were formed previously.
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影响因子：
5.8
作者：
S. Sheppard;R. Nielsen;H. Taylor
通讯作者：
S. Sheppard;R. Nielsen;H. Taylor
DOI：
--
发表时间：
2007
期刊：
Acta Geological Sinica
影响因子：
--
作者：
Liu Cun-ge
通讯作者：
Liu Cun-ge
DOI：
--
发表时间：
2008
期刊：
Natural Gas Industry
影响因子：
--
作者：
Xiaolong Qin
通讯作者：
Xiaolong Qin
DOI：
10.3133/wri884153
发表时间：
1988
期刊：
Water-Resources Investigations Report
影响因子：
--
作者：
L. Plummer;D. L. Parkhurst;G. W. Fleming;S. Dunkle
通讯作者：
L. Plummer;D. L. Parkhurst;G. W. Fleming;S. Dunkle
影响因子：
1.8
作者：
C. Cai;Kaikai Li;Bin Li;Liulu Cai;Lei Jiang
通讯作者：
C. Cai;Kaikai Li;Bin Li;Liulu Cai;Lei Jiang