Archie's cementation factors for natural rocks: Measurements and insights from diagenetic perspectives

IF 2.7 2区 地球科学 Q1 GEOLOGY
Xiaoqing Yuan , Qinhong Hu , Xianglong Fang , Qiming Wang , Yong Ma , Yukio Tachi
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引用次数: 0

Abstract

Archie's cementation factor, m, is a critical parameter for petrophysical studies, and the value is influenced by several factors such as the shape, type, and size of grains, degrees of diagenesis, and associated pore structure. Using integrated experimental and theoretical approaches, the goal of this study is to obtain the cementation factor of rocks (both reservoir rock and caprock) and assess the impact of diagenetic processes on the values of the cementation factor. Thirteen samples of geologically diverse rocks (six mudstones, four fossiliferous limestones, two marbles, and one sandstone) were selected to achieve these research objectives. Two approaches, the diffusion of gas tracers and the Bosanquet formula calculation using pore-throat sizes from mercury intrusion porosimetry analyses, were used to derive the cementation factors of these rock samples. These rocks were categorized into two groups based on the correlation between average pore-throat diameter and diffusivity, and an exponential-law relationship between the cementation factor and porosity was determined for these sample groups. In addition, thin-section petrography and field emission-scanning electron microscopy observations were utilized to investigate diagenetic processes, with four diagenetic patterns being established: (1) strong compaction, strong cementation, and weak dissolution-diagenesis pattern; (2) weak compaction, medium cementation, and weak dissolution-diagenesis pattern; (3) weak compaction, medium cementation, and strong dissolution-diagenesis pattern; and (4) fracture-matrix pattern. The results indicated that diagenetic processes and microfractures contribute to the variability in the cementation factors of these rock samples.

天然岩石的阿奇胶结系数:成岩学角度的测量和见解
Archie胶结系数m是岩石物理研究的一个关键参数,其值受多种因素影响,如颗粒的形状、类型和大小、成岩程度以及相关的孔隙结构。本研究采用实验和理论相结合的方法,旨在获得岩石(储层岩石和盖层岩石)的胶结因子,并评估成岩过程对胶结因子值的影响。为了实现这些研究目标,我们选择了 13 块地质不同的岩石样本(6 块泥岩、4 块含化石的灰岩、2 块大理岩和 1 块砂岩)。通过气体示踪剂扩散和利用汞侵入孔隙模拟分析得出的孔喉尺寸进行博桑凯公式计算这两种方法,得出了这些岩石样本的胶结系数。根据平均孔喉直径与扩散率之间的相关性,将这些岩石分为两组,并确定了这些样品组的胶结系数与孔隙度之间的指数规律关系。此外,还利用薄片岩相学和场发射扫描电子显微镜观察研究成岩过程,确定了四种成岩模式:(1)强压实、强胶结和弱溶解-成岩模式;(2)弱压实、中等胶结和弱溶解-成岩模式;(3)弱压实、中等胶结和强溶解-成岩模式;以及(4)断裂-基质模式。结果表明,成岩过程和微裂隙导致了这些岩石样本胶结因子的变化。
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来源期刊
Sedimentary Geology
Sedimentary Geology 地学-地质学
CiteScore
5.10
自引率
7.10%
发文量
133
审稿时长
32 days
期刊介绍: Sedimentary Geology is a journal that rapidly publishes high quality, original research and review papers that cover all aspects of sediments and sedimentary rocks at all spatial and temporal scales. Submitted papers must make a significant contribution to the field of study and must place the research in a broad context, so that it is of interest to the diverse, international readership of the journal. Papers that are largely descriptive in nature, of limited scope or local geographical significance, or based on limited data will not be considered for publication.
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