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黏土矿物类型和分布对工程多孔岩石物理化学和地质力学性能的影响。

Effects of type and distribution of clay minerals on the physico-chemical and geomechanical properties of engineered porous rocks.

机构信息

Department of Petroleum Engineering, Abadan Faculty of Petroleum, Petroleum University of Technology (PUT), Abadan, Iran.

Rock Mechanics Division, School of Engineering, Tarbiat Modares University, Tehran, Iran.

出版信息

Sci Rep. 2023 Apr 10;13(1):5837. doi: 10.1038/s41598-023-33103-4.

DOI:10.1038/s41598-023-33103-4
PMID:37037888
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10086063/
Abstract

The study of the properties of engineered rocks is of great importance to researchers in engineering sciences such as petroleum, mining, and civil engineering owing to their wide application in these fields. In the present study, a physico-chemical and geomechanical investigation was carried out on the effects of different clay minerals on porous rocks. Various chemical products formed during chemical interactions between cement, clay minerals, and water can change the pore structure and thus the rock characteristics. The results of the current study showed that increasing the clay content could remarkably reduce the porosity and permeability of the rock by an average of 86% and 6.76%, respectively. In this regard, samples containing kaolinite were further influenced due to their new pore structure. Moreover, a power relationship was found between sonic velocity and porosity, which can be used to predict rock properties. Chemical analysis indicated an amplification in quantities of chemical products, particularly calcium silicate hydrate and portlandite, due to an increase in clay content. The impacts of porosity and cementation quality as two main factors on rock strength have also been studied. The outcomes revealed that a reduction in porosity could compensate for detrimental effects of poor bond quality and consequently improved UCS by up to 30% in samples containing kaolinite, while decreasing the degree of cementation prevailed over the porosity reduction in specimens including illite and resulted in a 14% decrease in UCS. The effects of porosity and bond quality on UCS would cancel each other out in samples containing bentonite. It is worth noting that when it comes to changes in geomechanical characteristics, the dominant factor (i.e., porosity reduction or cementation quality) determines the ultimate effect of clay minerals on the properties of engineered porous rocks.

摘要

研究工程岩石的性质对于石油、采矿和土木工程等工程科学领域的研究人员非常重要，因为它们在这些领域有广泛的应用。在本研究中，对不同粘土矿物对多孔岩石的影响进行了物理化学和地质力学研究。水泥、粘土矿物和水之间的化学相互作用形成的各种化学产物会改变孔隙结构，从而改变岩石特性。目前的研究结果表明，粘土含量的增加会使岩石的孔隙度和渗透率分别平均降低 86%和 6.76%。在这方面，由于新的孔隙结构，含高岭石的样品受到进一步影响。此外，还发现声速与孔隙度之间存在幂函数关系，可用于预测岩石特性。化学分析表明，由于粘土含量的增加，化学产物的数量增加，特别是硅酸钙水合物和氢氧化钙。还研究了孔隙度和胶结质量作为两个主要因素对岩石强度的影响。结果表明，孔隙度的降低可以弥补胶结质量差的不利影响，从而使含高岭石样品的 UCS 提高高达 30%，而在含伊利石的样品中，降低胶结程度比降低孔隙度更为重要，导致 UCS 降低 14%。在含膨润土的样品中，孔隙度和胶结质量对 UCS 的影响会相互抵消。值得注意的是，当涉及到地质力学特性的变化时，主导因素（即孔隙度降低或胶结质量）决定了粘土矿物对工程多孔岩石性质的最终影响。

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