页岩断裂特征及发育控制因素研究

IF 0.6 4区 工程技术 Q4 ENERGY & FUELS
Li Wang, Zhehao Zhang, Jie Pan, Yan Xuguang, Xinxin Zhao, Hujun Gong
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引用次数: 0

摘要

本研究以四川盆地东南部页岩裂缝特征及其发育主控因素为重点,旨在深入了解页岩气藏裂缝网络及其对油气勘探的影响。通过对顶山-东溪、松坎地层中的龙马溪地层页岩进行地质调查和岩心样品分析,采用裂缝测量法、方差投影法和电子显微镜法对页岩裂缝的特征和主要控制因素进行了深入研究。结果表明:裂缝倾角主要以高角裂缝和直立裂缝为主,其中志留系直立裂缝占 57.35%,三叠系高角裂缝占 43.85%。裂缝填充物主要为方解石和黄铁矿,其中方解石和裂缝密度分析表明,志留系裂缝线密度主要为3-8线/m,占70.5%;微裂缝的发育在页岩气储运中也起着重要作用,微裂缝类型多样,包括开口缝和填充缝,为页岩气勘探提供了重要的储气空间;页岩裂缝发育程度与岩层矿物成分、有机碳含量和厚度有关。页岩裂缝的发育程度与矿物成分、有机碳含量和岩层厚度密切相关。脆性矿物成分和有机碳含量高的页岩裂缝发育程度较高,而岩层厚度越大,裂缝密度越低。这些研究结果表明,页岩裂缝的发育程度和类型在不同地质时期和构造区块之间存在显著差异,其复杂性和多样性对页岩气的储存和运输具有重要影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Research on Shale Fracture Characteristics and Developmental Controlling Factors

Research on Shale Fracture Characteristics and Developmental Controlling Factors

This study focuses on the shale fracture characteristics and their developmental master factors in the southeastern Sichuan Basin, aiming to gain a deeper understanding of the fracture network in shale gas reservoirs and its impact on hydrocarbon exploration. Through geological investigation and core sample analysis of Longmaxi Formation shales within the Dingshan-Dongxi and Songkan formations, the characteristics and main controlling factors of shale fractures were deeply studied by using fracture measurements, chi-square projection method and electron microscopy. The results show that: the inclination of cracks is mainly dominated by high-angle cracks and upright cracks, with the upright cracks of the Silurian system accounting for 57.35%, and the high-angle cracks of the Triassic system accounting for 43.85%. The fracture filler is mainly calcite and pyrite, in which the calcite and the analysis of fracture density shows that the density of Silurian fracture lines is mainly 3-8 lines/m, accounting for 70.5% of the total number; the development of microfractures also plays an important role in shale gas storage and transportation, and there are various types of microfractures, including open and filled seams, which provide an important storage space for shale gas exploration; the degree of development of shale fractures is related to the mineral components, organic carbon content and thickness of the rock formation. The degree of shale fracture development is closely related to the mineral fraction, organic carbon content and formation thickness. Shales with high brittle mineral content and organic carbon content have a higher degree of fracture development, while the greater the thickness of the formation, the lower the fracture density. These findings indicate that the development degree and types of shale fractures vary significantly among different geological periods and tectonic blocks, and that their complexity and diversity have important implications for shale gas storage and transportation.

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来源期刊
Chemistry and Technology of Fuels and Oils
Chemistry and Technology of Fuels and Oils 工程技术-工程:化工
CiteScore
0.90
自引率
16.70%
发文量
119
审稿时长
1.0 months
期刊介绍: Chemistry and Technology of Fuels and Oils publishes reports on improvements in the processing of petroleum and natural gas and cracking and refining techniques for the production of high-quality fuels, oils, greases, specialty fluids, additives and synthetics. The journal includes timely articles on the demulsification, desalting, and desulfurizing of crude oil; new flow plans for refineries; platforming, isomerization, catalytic reforming, and alkylation processes for obtaining aromatic hydrocarbons and high-octane gasoline; methods of producing ethylene, acetylene, benzene, acids, alcohols, esters, and other compounds from petroleum, as well as hydrogen from natural gas and liquid products.
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