摘要
应用X射线衍射(XRD)分析技术对湖南涟源凹陷石炭系测水组泥页岩进行矿物组成与脆性特征研究。结果表明,涟源凹陷石炭系测水组泥页岩中矿物成分复杂,石英含量最高,平均72.61%,粘土矿物含量次之,平均19.46%,含有少量的长石、白云石、黄铁矿和方解石,平均质量分数分别为4.02%,4.75%,2.01%和1.66%。总体来说,该地区石炭系测水组页岩的矿物组成特征与北美woodforth页岩比较相似。涟源凹陷测水组页岩中脆性矿物丰富、含量高,脆性指数平均0.8。研究表明涟源凹陷测水组泥页岩整体上具有良好的脆性特征,有利于该区页岩气的压裂改造。
The m ineral com position and brittleness chatacteristics of the C eshui form ation in Lianyuan depression were studied by X-ray diffraction (XRD) in this paper. The results showed that the C eshui Form ation in Lianyuan depression has com plexed m ineral com position.The quartz content is most abundant, average of 72.61% , respectively the m inor com ponent is clay, average of 19.46% . In addition, there are other sm all am ount of mineral com ponents,including pyrite, feldspar, dolom ite,w ith an average content of 4.02% ,4.7 5% ,2.0 1% and 1.66% . In general, the m ineral com position characteristics of the Ceshui Form ation in Lianyuan sag are sim ilar to Woodforth shale in the North Am erica. The C eshui Form ation shale in Lianyuan sag has high contents of brittle m inerals. The average value of brithleness index is 8. It is suggested that the C eshui Form ation organtic-rich in Lianyuan sag has favourable brittleness characteristics, and is beneficial to fracturing of shale gas.
作者
王强
白云山
苗凤彬
WANG Qiang;BAI Yun-Shan;MIAO Feng-Bin(Wuhan Center of China Geological Survey, Wuhan430205 , China)
出处
《华南地质与矿产》
CAS
2016年第2期166-171,共6页
Geology and Mineral Resources of South China
基金
中国地调局地质矿产调查评价专项项目"湘中坳陷页岩气资源远景调查"(编号:12120114049701)
关键词
涟源凹陷
测水组
矿物组成
脆性特征
页岩气
Lianyuan depression
Ceshui Form ation
shalem ineral compostion
brittleness characteristics
shale gas
