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四川威远及云南昭通区块龙马溪组优质页岩组构差异性与矿物纳米力学特征
Fabric difference and mineral nanomechanics characteristics of high-quality shale in Longmaxi Formation, Weiyuan block in Sichuan Basin and Zhaotong block in Yunnan Province
杨恒林1 张俊杰2 王高成2 付 利1 孙清华1 田中兰1
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DOI:
作者单位:1. 中国石油集团钻井工程技术研究院 2. 中国石油浙江油田公司
中文关键字:早志留世 优质页岩 组构差异性 矿物组分 胶结结构 弹性模量
英文关键字: Early Silurian; High-quality shale; Fabric difference; Mineral composition; Cementation structure; Elastic modulus
中文摘要:四川威远及云南邵通区块志留系下统龙马溪组龙一1 亚段富有机质黑色页岩是页岩气开发的主要目的层,评价其可
压裂性即可知其储层的可改造性。通过X 射线衍射、扫描电子显微镜和纳米压入技术分别获取了龙一1 亚段矿物组分含量、胶结
结构以及不同矿物弹性模量,揭示其脆性特征差异性,并分析了页岩中黏土矿物含量以及胶结类型对页岩裂缝非稳态扩展的影响
机理。结果表明:①龙一1 亚段黏土矿物含量自上而下逐渐降低,脆性逐渐增强;②胶结类型由黏土矿物基底胶结结构逐渐演变
为硅质等颗粒支撑结构;③页岩中硅质和有机质弹性模量分别为78.4 ~ 91.8 GPa 和6.1 ~ 9.3 GPa。结论认为:①页岩基质脆性
可以视为压裂过程中页岩裂缝具有发生非稳态扩展的能力,龙一11 和龙一12 层页岩黏土矿物含量质量分数低于30%,胶结类型为
颗粒支撑结构,压裂过程中裂缝发生非稳态扩展,易产生网状裂缝;②页岩的黏土矿物含量和石英等矿物颗粒支撑结构控制裂缝稳态—非稳态扩展,龙一1
4 层黏土矿物含量质量分数高于40%,大排量压裂过程中裂缝易沿着层理面稳态延伸。

DOI: 10.12055/gaskk.issn.1673-3177.2018.01.003



英文摘要:L11, organic-rich black shales of the Lower Silurian Longmaxi Formation, Weiyuan block in Sichuan Basin and Zhaotong
block in Yunnan Province, is the main target layer for developing shale gas in southern Sichuan Basin. So, it is necessary to identify its
fracturability. In this paper, the mineral composition, cementation structure, and elastic modulus were figured out by X-ray diffraction
(XRD), scanning electron microscope (SEM) and nanoindentation technology (NIT), in order to reveal the diversity of brittleness characteristics.
Moreover, the content of clay minerals and the influential mechanisms of cementation types on the unsteady propagation of
shale fractures were analyzed. Results show that: (1) the content of clay minerals decreases whereas the brittleness increases, from top
to bottom; (2) the cementation type is evolved gradually from the cementation structure with clay minerals as the basement to the one
with the silica and other particles as the support; and (3) the elastic modulus of silica and organic matter are 78.4–91.8 GPa and 6.1–9.3
GPa, respectively. As concluded, shale fractures have the capability of unsteady propagation during fracturing due to brittleness of
shale matrix. The mass fraction of clay mineral content is less than 30% in L11
1 and L11
2 shales, and the cementation is of particle support
structure, so unsteady propagation of induced fractures and fracture networks tend to be formed easily. Moreover, the steady–unsteady
propagation of fractures is controlled by the content of clay minerals and the support structure of mineral particles (e.g. quartz).
The mass fraction is more than 40% in L11
4 shale, so the fractures tend to propagate steadily along bedding plane in the process of
fracturing at high flow rate.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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