Tracing enhanced oil recovery signatures in casing gases from the Lost Hills oil field using noble gases
Tracing enhanced oil recovery signatures in casing gases from the Lost Hills oil field using noble gases
复制标题
DOI：
10.1016/j.epsl.2018.05.028
复制
发表时间：
2018-08-15
影响因子：
5.3
通讯作者：
Ballentine, C. J.
中科院分区：
文献类型：
--
作者：
Barry, P. H.;Kulongoski, J. T.;Ballentine, C. J.
提高石油采收率（EOR）和水力压裂实践是提高油气开采效率的常用方法;然而，对这些实践的环境影响仍然知之甚少。EOR在整个加州的油田中特别普遍，在这些油田中，水资源的需求量很高，并且大量采出水的处置可能影响地下水质量。因此，有必要更好地了解注入（EOR）流体在加州和其他地下石油系统的命运，以及对附近含水层系统的任何潜在影响。稀有气体可用作示踪剂，以了解碳氢化合物的生成、迁移和储存条件，以及地下存在的油和水的相对比例。此外，可以容易地识别注入（EOR）流体的惰性气体特征诊断。我们报告的稀有气体同位素和浓度数据套管气体从石油生产威尔斯在失落的丘陵油田，西北部的贝克斯菲尔德，加州州，和注入气体数据从Fruitvale油田，位于城市内的贝克斯菲尔德。套管和注入气体数据用于：1）建立原始烃惰性气体特征和控制惰性气体分布的过程，2）表征注入流体的惰性气体特征，3）追踪地下的注入流体，以及4）构建模型以估计EOR效率。稀有气体的结果范围从原始的显着修改EOR，并可以最好地解释使用石油和原生/地层流体之间的溶解度交换模型，然后在生产时的气体出溶。该模型对油气在储层条件下的排烃、运移和储存过程中的油水相互作用以及随后通过提高采收率进行的任何修改都很敏感。(C)2018 Elsevier B. V.版权所有。
Enhanced oil recovery (EOR) and hydraulic fracturing practices are commonly used methods to improve hydrocarbon extraction efficiency; however, the environmental effects of such practices remain poorly understood. EOR is particularly prevalent in oil fields throughout California where water resources are in high demand and the disposal of large volumes of produced water may affect groundwater quality. Consequently, it is essential to better understand the fate of injected (EOR) fluids in California, and other subsurface petroleum systems, as well as any potential effect on nearby aquifer systems. Noble gases can be used as tracers to understand hydrocarbon generation, migration, and storage conditions, as well as the relative proportions of oil and water present in the subsurface. In addition, a noble gas signature diagnostic of injected (EOR) fluids can be readily identified. We report noble gas isotope and concentration data in casing gases from oil production wells in the Lost Hills oil field, northwest of Bakersfield, California, and injectate gas data from the Fruitvale oil field, located within the city of Bakersfield. Casing and injectate gas data are used to: 1) establish pristine hydrocarbon noble-gas signatures and the processes controlling noble gas distributions, 2) characterize the noble gas signature of injectate fluids, 3) trace injectate fluids in the subsurface, and 4) construct a model to estimate EOR efficiency. Noble gas results range from pristine to significantly modified by EOR, and can be best explained using a solubility exchange model between oil and connate/formation fluids, followed by gas exsolution upon production. This model is sensitive to oil-water interaction during hydrocarbon expulsion, migration, and storage at reservoir conditions, as well as any subsequent modification by EOR. (C) 2018 Elsevier B.V. All rights reserved.