中国西北部塔里木盆地奥陶纪碳酸盐岩中由构造驱动的流体混合形成的下生岩溶洞穴

IF 2.7 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
AAPG Bulletin Pub Date : 2024-01-01 DOI:10.1306/08022321011
Lei Jiang, Anjiang Shen, Zhanfeng Qiao, Anping Hu, Zhaohui Xu, Heng Zhang, Bo Wan, Chunfang Cai
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引用次数: 0

摘要

构造作用促进的水文地质循环通常与碳酸盐岩中岩溶洞穴的形成有关,为沉积盆地提供了承载能源资源(即碳氢化合物和地热)的绝佳储层。由于构造作用发生的时间和相关流体的特征存在不确定性,因此很难预测深层地下的此类岩洞储层,这阻碍了相关的油气勘探。本研究通过对中国西北部塔里木盆地奥陶系岩洞储层中裂缝和洞穴充填碳酸盐的碳酸盐U-Pb年代学、地球化学和地震数据分析相结合,寻找与构造相关的流体活动的新证据。至关重要的是,碳酸盐 U-Pb 年龄证实了这些岩溶化事件与当地构造的同步和/或矿化后断层密切相关。断裂自生矿物中的地球化学特征进一步表明,偶发性发育的流星水与深层基底盐水混合。活跃的水文循环和流体混合甚至硫酸的形成可能显著提高了碳酸盐的溶解速率,从而促进了与深层断裂和断层密切相关的岩溶洞穴的形成。这项研究强调了低成因岩溶化在塔里木盆地奥陶纪单元岩洞碳酸盐岩储层形成过程中不可或缺的作用,其成果可为该盆地及全球其他类似盆地的油气勘探提供有益的指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hypogenic karstic cavities formed by tectonic-driven fluid mixing in the Ordovician carbonates from the Tarim Basin, northwestern China
Enhanced hydrogeologic circulations promoted by tectonics are commonly linked to karstic cavity formation in carbonate rocks, providing superb reservoirs for hosting energy resources (i.e., hydrocarbon and geothermal) in sedimentary basins. Predicting such cavern reservoirs in the deep subsurface is difficult mainly due to uncertainties in timing the tectonics and characterizing their associated fluids, which hamper the related hydrocarbon exploration. By combining carbonate U-Pb chronology, geochemistry, and seismic data analyses of fracture and cave-filling carbonates in cavern reservoirs from the Ordovician units of the Tarim Basin, northwestern China, the current study sought new evidence for fluid activities related to tectonics. Crucially, carbonate U-Pb ages confirm that these karstification events were closely related to syn- and/or postmineralization faulting by local tectonics. Geochemistry signatures in the authigenic minerals of fractures further suggest that the episodically developed meteoric water mixed with deep basinal brine. The carbonate dissolution rate might have been markedly enhanced by active hydrologic circulation and fluids mixing or even the formation of sulfuric acid, thus promoting the formation of karstic cavities that was closely related to the deep-rooted fractures and faults. This study highlights the indispensable role of hypogenic karstification in the formation of cavern carbonate reservoirs in the Ordovician units of the Tarim Basin and the outcome from this new contribution may provide useful guidelines for hydrocarbon exploration in the basin and other global analogues.
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来源期刊
AAPG Bulletin
AAPG Bulletin 工程技术-地球科学综合
CiteScore
6.60
自引率
11.40%
发文量
73
审稿时长
4.8 months
期刊介绍: While the 21st-century AAPG Bulletin has undergone some changes since 1917, enlarging to 8 ½ x 11” size to incorporate more material and being published digitally as well as in print, it continues to adhere to the primary purpose of the organization, which is to advance the science of geology especially as it relates to petroleum, natural gas, other subsurface fluids, and mineral resources. Delivered digitally or in print monthly to each AAPG Member as a part of membership dues, the AAPG Bulletin is one of the most respected, peer-reviewed technical journals in existence, with recent issues containing papers focused on such topics as the Middle East, channel detection, China, permeability, subseismic fault prediction, the U.S., and Africa.
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