[an error occurred while processing this directive] 高校地质学报 2015, 21(1) 117- DOI:   10.16108/j.issn1006-7493.20141   ISSN: 1006-7493 CN: 32-1440/P

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本文关键词相关文章
泥页岩储层
矿物成分
脆性特征
X 射线衍射
中侏罗统
柴达木盆地北缘
本文作者相关文章
PubMed
柴北缘中侏罗统湖相泥页岩储层矿物组成与脆性特征
原园,姜振学,喻宸,郭天旭,申玉山,赵若彤
摘要

运用X 射线衍射技术,对柴北缘中侏罗统46块岩心泥页岩样品和15块露头泥页岩样品进行了定性和定量分析。结果
表明研究区泥页岩矿物成分中黏土矿物含量最高,介于33%~79.7%之间,平均54.3%;其次为石英,含量介于14.5%~
57.8%之间,平均35.4%;碳酸盐矿物含量较少,总量一般介于0~13%之间,个别样品大于15%,露头样品与岩心样品矿物
成分有差别。黏土矿物组合特征反映出研究区进入中成岩阶段,对应有机质演化的成熟阶段,具有适宜页岩油气形成的成
熟度条件。扫描电镜显示,研究区泥页岩发育3种孔隙类型。与海相页岩相比,柴北缘中侏罗统泥页岩黏土矿物含量高但
敏感性矿物含量低,石英、长石等脆性矿物含量偏低但达到湖相泥页岩开发标准,脆性指数平均为42.6%,整体上具有较
好的脆性和可压性,有利于该区湖相页岩的压裂改造。

关键词 泥页岩储层   矿物成分   脆性特征   X 射线衍射   中侏罗统   柴达木盆地北缘  
Mineral Compositions and Brittleness of the Middle Jurassic Iacustrine Shale Reservoirin Northern Qaidam Basin
YUAN Yuan, JIANG Zhenxue, YU Chen, GUO Tianxu, SHEN Yushan, ZHAO Ruotong
Abstract:

X-ray diffraction (XRD) was used to qualitatively and quantitatively analyze Middle Jurassic lacustrine shale samples from
the northern Qaidam Basin. Results revealed that clay minerals were dominant with a range of 33%~79.7% and averaged in 54.3%.
Quartz mineral ranged from 14.5% to 57.8% with an average of 35.4%. Carbonate mineral ranged from 0 to 15%. Clay mineral
compositions show a middle diagenetic stage, corresponding to a mature evolutionary stage of hydrocarbons with a suitable maturity
condition for shale oil and gas formation. Three types of pores were found in the study area including intragranular pore, intergranular
pore, and marco fracture. Compared with marine shales, Middle Jurassic lacustrine shales in the northern Qaidam Basin have higher
content of clay minerals, less sensitive mineral, and relatively lower content of brittle minerals such as quartz and feldspar but can meet
criteria for the lacustrine shale gas reservoir exploitation. The average index of mineral brittleness was 42.6% suggesting a good

property of brittleness and compressibility which is good for fracturing.

Keywords: shale reservoir   mineral compositions   brittleness   X-ray diffraction   Middle Jurassic   Northern Qaidam Basin  
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DOI: 10.16108/j.issn1006-7493.20141
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