油气藏评价与开发 >
2025 , Vol. 15 >Issue 2: 227 - 236
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2025.02.007
深/浅部煤储层孔裂隙结构及三维空间分布差异特征
收稿日期: 2024-10-21
网络出版日期: 2025-04-01
基金资助
国家自然科学基金项目“煤层气低产储层靶向改造增产关键理论及技术基础”(42230814);河南省高等学校重点项目计划“煤层气井煤粉沉降规律及处理系统研究”(25B170010)
Characteristics of pore-fracture structure and three-dimensional spatial distribution differences in deep and shallow coal reservoirs: A case study of Junggar Basin
Received date: 2024-10-21
Online published: 2025-04-01
深/浅部煤储层孔隙-裂隙结构差异特征对煤层气开采具有较大影响，针对这些结构特征差异进行的研究可为探索其物性特征，寻找煤层气勘探开发有利区提供部分理论依据。以准噶尔盆地深/浅部煤储层的煤岩样品作为研究对象，对深/浅部样品进行扫描电子显微镜、低温N2吸附、高压压汞和CT（计算机断层成像）扫描等测试。测试结果表明，从浅部到深部的煤岩样品的渗透率逐渐降低，总孔体积逐渐降低，微孔与大孔分布频率逐渐降低；浅层样品孔隙-裂隙发育较好，中孔与大孔阶段孔隙分形维数值低，孔隙发育的均质性强，大孔隙与微裂隙相互连通；深部煤岩样品孔隙-裂隙发育相对较为孤立，在中孔与大孔阶段孔隙发育情况较复杂，孔隙-裂隙多被矿物充填。通过最大球算法对样品构建孔隙网络模型，阐明了样品连通孔裂隙的分布规律、形态与结构在三维空间的发育情况，并对等效孔隙、孔喉参数等结构参数和连通情况进行统计和分析，发现浅层样品连通孔隙度和总孔隙度优于深层样品，浅部样品孔隙-裂隙数量多，在微裂隙尺度占有优势，喉道短，孔喉半径大，发育密集，配位数高，连通性好，有利于气体在储层中流动。研究成果对于准噶尔盆地开发深/浅部煤层气采用适配性技术提供了实验数据支撑，对现场开发具有一定的指导意义。
关键词： 准噶尔盆地; 深部煤层气; 孔隙特征; 物性特征; CT（计算机断层成像）扫描
王鹏翔 , 张洲 , 余婉莹 , 邹强 , 杨正滔 . 深/浅部煤储层孔裂隙结构及三维空间分布差异特征[J]. 油气藏评价与开发, 2025 , 15(2) : 227 -236 . DOI: 10.13809/j.cnki.cn32-1825/te.2025.02.007
The differences in pore-fracture structures between deep and shallow coal reservoirs significantly affect coalbed methane extraction. Research on these structural differences provides theoretical support for exploring their physical properties and identifying favorable zones for coalbed methane exploration and development. This study analyzed coal samples from deep and shallow coal reservoirs in the Junggar Basin. These samples were tested using scanning electron microscopy, low-temperature N2 adsorption, high-pressure mercury injection, and CT scan. The results showed that, from shallow to deep coal samples, the permeability, total pore volume, and distribution frequency of micropores and macropores gradually decreased. The shallow coal samples exhibited well-developed pores and fractures, with low fractal dimensions in the mesopore and macropore stages, strong homogeneity in pore development, and interconnection between macropores and microfractures. In contrast, the deep coal samples showed relatively isolated pore-fracture development, more complex pore development in the mesopore and macropore stages, and significant mineral filling within pores and fractures. A pore network model for the samples was established using the maximal sphere algorithm to analyze the distribution pattern, morphology, and three-dimensional structural development of the connected pores and fractures. The equivalent pores, throat parameters, and other structural parameters, along with the connectivity, were statistically analyzed. The results revealed that shallow coal samples showed higher connectivity and total porosity compared to the deep samples. The shallow samples exhibited more pores and fractures, with a dominance at the microfracture scale. Additionally, they exhibited shorter throats, larger pore-throat radii, denser pore development, higher coordination numbers, and better connectivity, which facilitated gas flow in the reservoir. The research findings provide experimental data support for the development of deep and shallow coalbed methane in the Junggar Basin using adaptive technologies, and offer valuable guidance for on-site development.
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