用电镜方法研究拉伸条件下岩石空腔的织构变化

IF 0.8 Q3 ENGINEERING, PETROLEUM
Georesursy Pub Date : 2023-06-30 DOI:10.18599/grs.2023.2.16
B. Osovetsky, K. P. Kazymov, I. Kolychev, Yan V. Savitckii, S. Galkin
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引用次数: 1

摘要

以伏尔加-乌拉尔地区的一个维列斯克时代的石油矿床为例,岩石的岩性被区分开来,其特征是孔隙空间的结构根本不同。对选定的岩心样品进行了体积压缩(拟三轴)条件下岩石应力状态变化的实验。实验中产生的压力与水力裂缝出现的中心距离处的过程发展有关。采用无损检测方法对岩心样品暴露前后进行了研究。通过标准和层析方法对样品结构的研究不允许我们在样品加载期间建立显着变化。同时,试验也证实了岩石渗透性的增加。考虑到这一点,根据作者使用电子显微镜专门开发的技术对样品进行了研究。显微研究的使用使得在x射线断层扫描无法达到的水平上获得关于空隙空间变化的定量信息成为可能。结果发现,无论是潜在储层还是不透水岩石,原有裂缝的长度和开度都有所增加,这可以认为是形成了额外的有效流体过滤通道。所进行的实验改变了水力裂缝发育过程的观念,可用于地质和工艺计算。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of texture changes in the emptiness of rocks under the tension conditions by electron microscopy methods
On the example of an oil deposit of the Vereisk age which is one of the deposits in the Volga-Urals, lithotypes of rocks are distinguished, characterized by a fundamentally different structure of the void space. For selected lithotypes experiments were carried out on core samples with a change in the stress state of rocks under conditions of volumetric (pseudo-triaxial) compression. The pressure created in the experiments is identified with the development of processes at a distance from the epicenter of the hydraulic fractures appearance. Core samples were studied before and after exposure by non-destructive testing methods. The study of the sample structures by standard and tomographic methods did not allow us to establish significant changes during loading of the samples. At the same time, some increase in rock permeability was established in experiments. With this in mind, the samples were studied according to a technique specially developed by the authors using electron microscopy. The use of microscopic studies made it possible to obtain quantitative information about the change in the void space at a level inaccessible to X-ray tomography. As a result, it was found that both for potential reservoirs and for impermeable rocks, there is an increase in the length and opening of pre-existing fractures, which can be considered as the formation of additional effective fluid filtration channels. The experiments performed have changed the idea of ​​the process of hydraulic fracture development and can be used in geological and technological calculations.
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来源期刊
Georesursy
Georesursy ENGINEERING, PETROLEUM-
CiteScore
1.50
自引率
25.00%
发文量
49
审稿时长
16 weeks
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