Evaluating the impact of artificial maturation on the petrophysical and geochemical properties of unconventional shale formations by integrating dielectric and NMR measurements

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Geology Pub Date : 2024-03-15 DOI:10.1016/j.coal.2024.104492
Amjed Hassan , Mahmoud Elsayed , Ali Oshaish , Salah Al-Ofi , Ammar El-Husseiny , Israa S. Abu-Mahfouz , Mohamed Mahmoud , Mohamed Abouelresh , Hussein Attia
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Abstract

This paper addresses challenges in characterizing unconventional shale reservoirs. For the first time, the nuclear magnetic resonance (NMR) and dielectric responses are integrated to characterize intact, saturated, and kerogen-rich subsurface shale samples at various maturation stages. The NMR and dielectric were measured separately using independent pieces of equipment, and all NMR and dielectric measurements were carried out at surface conditions. A comprehensive assessment is provided to address the changes induced by maturation through combined geochemical and petrophysical analyses. Shale samples from the Upper Cretaceous sequence of Jordan were characterized using Rock-Eval analysis, before and after maturation treatments. The total organic carbon (TOC) was decreased from 17.4 to 13.8 and 11.3 wt% and the pyrolyzed sulfur content was decreased from 3.32 to 0.25 and 0.15 3.18%, after maturing the samples at 250 °C for 1 and 5 days, respectively. The study employed NMR to track changes in pore structure via T2 relaxation time and measured dielectric properties and conductivity dispersion across frequencies from 10 MHz to 1 GHz using a wideband open-ended coaxial probe. After the maturation treatments, the dielectric constant of saturated shale samples doubled, and the conductivity increased by over three times. These changes in dielectric properties can be attributed to increased fluid-rock interfacial polarization and the formation of new pore spaces during maturation. NMR findings also indicated the emergence of a new pore system within the organic matter and the development of new fractures, resulting in a 6 to 12% increase in total porosity. The results obtained indicate that maturation-induced microstructural changes have a more significant influence on the dielectric responses than alterations on total organic carbon.

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通过整合介电测量和核磁共振测量评估人工成熟对非常规页岩层岩石物理和地球化学性质的影响
本文探讨了非常规页岩储层的表征难题。本文首次将核磁共振(NMR)和介电反应结合起来,对处于不同成熟阶段的完整、饱和和富含角质的地下页岩样本进行了表征。核磁共振和介电分别使用独立的设备进行测量,所有核磁共振和介电测量都是在地表条件下进行的。通过综合地球化学和岩石物理分析,对成熟引起的变化进行了全面评估。使用 Rock-Eval 分析方法对约旦上白垩统序列的页岩样本在熟化处理前后的特征进行了分析。样品在 250 °C 下熟化 1 天和 5 天后,总有机碳 (TOC) 分别从 17.4% 降至 13.8% 和 11.3%,热解硫含量分别从 3.32% 降至 0.25% 和 0.15 3.18%。研究采用核磁共振技术通过弛豫时间跟踪孔隙结构的变化,并使用宽带开口同轴探针测量了介电性能和电导率色散,频率范围从 10 MHz 到 1 GHz。经过熟化处理后,饱和页岩样品的介电常数增加了一倍,电导率增加了三倍多。介电性质的这些变化可归因于成熟过程中流体-岩石界面极化的增加和新孔隙的形成。核磁共振研究结果还表明,有机质中出现了新的孔隙系统,并形成了新的裂缝,从而使总孔隙度增加了 6% 至 12%。研究结果表明,与有机碳总量的变化相比,成熟引起的微观结构变化对介电响应的影响更为显著。
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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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