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Geochemical and isotope analysis of produced water from the Utica/Point Pleasant Shale, Appalachian Basin.
Environmental Science: Processes & Impacts ( IF 5.5 ) Pub Date : 2020-04-23 , DOI: 10.1039/d0em00066c
T L Tasker 1 , N R Warner , W D Burgos
Affiliation  

While development of the Utica/Point Pleasant Shale (UPP) is extensive in Ohio (U.S.) and increasing in Pennsylvania and West Virginia, few studies report the chemistry of produced waters from UPP wells. These data have important implications for developing best management practices for handling and waste disposal, or identifying the fluid in the event of accidental spill events. Here, we evaluated the elemental and isotope chemistry of UPP produced waters from 26 wells throughout Ohio, Pennsylvania, and West Virginia to determine any unique fluid chemistries that could be used for forensic studies. Compared to the Marcellus, UPP produced waters contain higher activities of total radium (226Ra + 228Ra) and higher 228Ra/226Ra ratios. As with the Marcellus Shale, elemental ratios (Sr/Ca) and isotope ratios (87Sr/86Sr) can distinguish UPP produced waters from many conventional oil and gas formations. Sr/Ca and 87Sr/86Sr ratios can fingerprint small fractions (∼0.1%) of UPP produced water in freshwater. However, because Marcellus and UPP produced waters display similar major elemental chemistry (i.e., Na, Ca, and Cl) and overlapping ratios of Sr/Ca and 87Sr/86Sr, 228Ra/226Ra ratios may be the best tracer to distinguish these waters.

中文翻译:

阿巴拉契亚盆地Utica / Point Pleasant页岩产水的地球化学和同位素分析。

虽然Utica / Point Pleasant页岩(UPP)的开发在俄亥俄州(美国)广泛发展,而在宾夕法尼亚州和西弗吉尼亚州则在增加,但很少有研究报道过UPP井的采出水的化学性质。这些数据对于开发处理和废物处置的最佳管理方法,或在意外泄漏事件中识别液体具有重要意义。在这里,我们评估了从整个俄亥俄州,宾夕法尼亚州和西弗吉尼亚州的26口井中UPP产生的水的元素和同位素化学,以确定可用于法医研究的任何独特的流体化学。与Marcellus相比,UPP产生的水的总镭(226Ra + 228Ra)活度更高,且228Ra / 226Ra比更高。与Marcellus页岩一样,元素比率(Sr / Ca)和同位素比率(87Sr / 86Sr)可以将UPP生产的水与许多常规的石油和天然气地层区分开。Sr / Ca和87Sr / 86Sr的比率可以识别淡水中UPP采出水的一小部分(约0.1%)。但是,由于Marcellus和UPP生产的水显示出相似的主要元素化学性质(即Na,Ca和Cl),并且Sr / Ca和87Sr / 86Sr的重叠比,所以228Ra / 226Ra比可能是区分这些水的最佳示踪剂。
更新日期:2020-04-23
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