利用多分形法量化碱性湖页岩在水合热解过程中的孔隙异质性

Yanxin Liu, Hong Zhang, Zhengchen Zhang, Luda Jing, Kouqi Liu
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摘要

碱湖页岩有别于海相页岩层,作为重要的烃源岩和石油储层,表现出明显的多分形特征和演化规律。本研究结合含水热解实验、氮吸附分析和多分形理论,研究了富含碱性矿物的页岩成熟过程中孔隙异质性和多分形维度的影响因素。利用偏最小二乘法(PLS)分析进行比较研究,阐明了矿物成分对各自多分形维度的不同影响。研究结果表明,在碱性湖页岩的整个成熟过程中,孔隙特征发生了动态演变,并划分为三个不同的阶段。起初,在第一阶段(200 °C至300 °C),ΔD和H均呈现递增趋势,分别从1.2699升至1.3和从0.8615升至0.8636。随后,在第二和第三阶段,ΔD 和 D 值出现波动,而 H 值则明显下降至 0.85。此外,参数 D1 在所有阶段都呈递减轨迹,从 0.859 降至 0.829,表明孔隙结构特征在整个成熟过程中不断演变。与其他页岩品种相比,碱性湖页岩独特的碱性环境和矿物成分在其成熟过程中产生了不同的成岩作用。因此,这种差异导致孔隙异质性和多分形特征呈现出截然不同的演化轨迹。具体来说,碱性湖页岩的多分形特征主要受石英、钾长石、粘土矿物和碱性矿物的影响。
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Quantifying the Pore Heterogeneity of Alkaline Lake Shale during Hydrous Pyrolysis by Using the Multifractal Method
Distinguishing itself from marine shale formations, alkaline lake shale, as a significant hydrocarbon source rock and petroleum reservoir, exhibits distinct multifractal characteristics and evolutionary patterns. This study employs a combination of hydrous pyrolysis experimentation, nitrogen adsorption analysis, and multifractal theory to investigate the factors influencing pore heterogeneity and multifractal dimension during the maturation process of shale with abundant rich alkaline minerals. Utilizing partial least squares (PLS) analysis, a comparative examination is conducted, elucidating the disparate influence of mineralogical composition on their respective multifractal dimensions. The findings reveal a dynamic evolution of pore characteristics throughout the maturation process of alkaline lake shale, delineated into three distinct stages. Initially, in Stage 1 (200 °C to 300 °C), both ΔD and H demonstrate an incremental trend, rising from 1.2699 to 1.3 and from 0.8615 to 0.8636, respectively. Subsequently, in Stages 2 and 3, fluctuations are observed in the values of ΔD and D, while the H value undergoes a pronounced decline to 0.85. Additionally, the parameter D1 exhibits a diminishing trajectory across all stages, decreasing from 0.859 to 0.829, indicative of evolving pore structure characteristics throughout the maturation process. The distinct alkaline environment and mineral composition of alkaline lake shale engender disparate diagenetic effects during its maturation process compared with other shale varieties. Consequently, this disparity results in contrasting evolutionary trajectories in pore heterogeneity and multifractal characteristics. Specifically, multifractal characteristics of alkaline lake shale are primarily influenced by quartz, potassium feldspar, clay minerals, and alkaline minerals.
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