页岩储集层脆性研究进展

发布时间：2018-04-30 13:08

本文选题：页岩 + 储集层　；参考：《新疆石油地质》2017年01期

【摘要】：脆性是选择页岩储集层有利压裂层段的关键指标,常用评价方法包括矿物法和弹性参数法。中国南方海相页岩具有沉积环境多样、岩相类型复杂、埋深范围大等特点,通过实例分析了现有评价方法存在的理论缺陷和适用性限制。根据页岩岩石力学性质的研究认识,重点总结了矿物组成、有机质、层理和围压对脆性的影响,并阐释了页岩脆性与可压裂性的关系。综合分析指出:矿物法有更强的实用性,但是对脆性矿物的界定模糊,弹性参数法可以有效实现测井和地震预测,但是无法反映围压的影响,难以表征深层和浅层页岩脆性差异。结合中国南方海相页岩的岩相类型和埋深范围,基于不同矿物组分的脆性差异,提出以石英、白云石和黄铁矿作为脆性矿物;基于围压对脆性的影响,提出在弹性参数的基础上增加强度或断裂韧性作为围压指示因子,以适应深层页岩脆性评价。深入认识矿物组成、有机质、层理和围压对脆性的影响,以及脆性与可压裂性的关系,有助于页岩岩相的精细表征和"甜点"优选。
[Abstract]:Brittleness is the key index for selecting favorable fracturing zone of shale reservoir. The commonly used evaluation methods include mineral method and elastic parameter method. Marine shale in southern China is characterized by a variety of sedimentary environments, complex lithofacies types and a wide range of buried depth. The theoretical defects and applicability limitations of existing evaluation methods are analyzed through examples. Based on the study of the mechanical properties of shale rocks, the effects of mineral composition, organic matter, bedding and confining pressure on brittleness are summarized, and the relationship between shale brittleness and fracturing property is explained. The comprehensive analysis shows that the mineral method is more practical, but the definition of brittle minerals is vague, the elastic parameter method can effectively realize logging and earthquake prediction, but it can not reflect the influence of confining pressure. It is difficult to characterize the difference of brittleness between deep and shallow shale. According to the lithofacies type and buried depth range of marine shale in southern China, based on the brittleness difference of different mineral components, quartz, dolomite and pyrite are proposed as brittle minerals, and the influence of confining pressure on brittleness is considered. In order to adapt to the deep shale brittleness evaluation, increasing strength or fracture toughness on the basis of elastic parameters is proposed as the confining pressure indicator factor. A thorough understanding of the effects of mineral composition, organic matter, bedding and confining pressure on brittleness, and the relationship between brittleness and fracturability is helpful to the fine characterization of shale facies and the selection of "desserts".
【作者单位】：中国石油勘探开发研究院;国家能源页岩气研发(实验)中心;中国石油大学地球科学学院;
【基金】：国家973项目(2013CB228001) 国家科技重大专项(2011ZX05018-001)
【分类号】：TE311

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