超深层白云岩气藏孔喉结构的应变特征

IF 4.3 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
ACS Omega Pub Date : 2025-07-27 DOI:10.1021/acsomega.5c00719
Yuxiang Zhang*, Haijun Yan, Yunsheng Wei, Zhenglin Cao, Jianlin Guo, Hui Deng, Yu Luo, Yandong Jiang, Junlei Wang and Nan Qin, 
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引用次数: 0

摘要

对埋藏深、应力高、裂缝和大孔隙发育的超深白云岩的应变特征研究较少。通过建立应力实验和压裂实验,采用计算机断层扫描(CT)技术,对比研究了应力和压裂作用对不同类型超深白云岩孔喉结构的影响。在应力试验中,考虑了流固耦合对孔隙空间的影响。研究表明,与浅、中碳酸盐岩储层不同,当应力高但低于岩石屈服应力且处于流动状态时,所研究的超深白云岩压缩恢复后具有较高的渗透率。当应力较高时,岩样内部发生脆性变形,大孔隙中的白云石颗粒被压碎分离,随气体流动堵塞中间孔隙;两个相邻的中孔合并为一个大孔。这样,岩样的平均孔径增大,大孔体积所占比例增大。大孔隙的增加对提高储层渗透率起主导作用。在高应力作用下,白云岩晶体边缘被压开,导致晶间裂缝更加发育,裂缝宽度增大,裂缝间连通性增强。除了应力的作用外,压裂产生的裂缝还会极大地扩展并连接已有裂缝,从而提高储层的连通性,这是导致压裂后储层渗透率提高的主要因素。另外,通过三轴力学试验获得了岩石力学参数。经过多次应力循环的白云岩试样微裂缝和大孔隙更为发育,抗轴压能力减弱,更容易破裂。该研究可为超深层白云岩的高效开发提供理论依据和指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Strain Characteristics of Pore-Throat Structures in an Ultradeep Dolomite Gas Reservoir

There is little research on the strain characteristics of ultradeep dolomite rocks with deep burial, high stress, and developed fractures and macropores. This article comparatively studies the influence of stress and fracturing on the pore-throat structure of different types of ultradeep dolomite rocks by setting up stress experiments and fracturing experiments and using computed tomography (CT) scanning. In the stress experiment, the fluid–solid coupling effect on pore space was considered. The study shows that unlike shallow to medium carbonate reservoirs, when the stress is high but lower than the rock yield stress and in a flowing state, the studied ultradeep dolomite rock has a higher permeability after recovery from compression. When the stress is high, brittle deformation occurs inside the rock sample, and dolomite particles in the macropores are crushed and detached, blocking the middle pores with the gas flow; the two adjacent mesopores are merged into one macropore. In this way, the average pore size of the rock sample increases and the proportion of macropore volume increases. The increase in macropores plays a leading role in improving the reservoir’s permeability. The edges of dolomite crystals are compressed open under high stress, resulting in more developed intercrystalline fractures, larger fracture widths, and strengthened communication between fractures. Besides the effect of stress, the fractures generated by fracturing greatly expand and connect the existing fractures, and then improve the connectivity of the reservoir, which is the main factor leading to the improvement of reservoir permeability after fracturing. In addition, rock mechanical parameters were obtained through triaxial mechanics experiments. Dolomite rock samples that have undergone multiple cycles of stress cycling have more developed microfractures and macropores and weakened axial compression resistance and are more prone to be fractured. This study can provide a theoretical basis and guidance for the efficient development of ultradeep dolomite.

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来源期刊
ACS Omega
ACS Omega Chemical Engineering-General Chemical Engineering
CiteScore
6.60
自引率
4.90%
发文量
3945
审稿时长
2.4 months
期刊介绍: ACS Omega is an open-access global publication for scientific articles that describe new findings in chemistry and interfacing areas of science, without any perceived evaluation of immediate impact.
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