2016年2期

湖南涟源凹陷下石炭统测水组泥页岩矿物组分与脆性特征研究

发布时间:2016-09-05阅读次数:

【期数】2016-2

【作者】王 强,白云山,苗凤彬

【机构】中国地质调查局武汉地质调查中心,武汉,430205

【关键词】涟源凹陷;矿物组成;脆性特征;页岩气

【中文摘要】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,平均含量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。

【英文摘要】The mineral composition and brittleness chatacteristics of the ceshui formation in Lianyuan depression were studied by X-ray diffraction(XRD) in this paper. The results showed that the ceshui formation in Lianyuan depression has complexed mineral composition.The quartz content is most abundant, average of 72.61%, respectively the minor component is clay,average of 19.46%. In addition, there are other small amount of mineral components, including pyrite, feldspar, dolomite,with an average content of 4.02%、4.75%、2.01% and 1.66%. In general, the mineral composition characteristics of the Ceshui formation in Lianyuan sag are similar to Woodforth shale in the North America. The ceshui formation shale in Lianyuan sag has high contents of brittle minerals. The average value of brithleness index is 8. It is suggested that the ceshui formation organtic-rich in Lianyuan sag has favourable brittleness characteristics, and is beneficial to fracturing of shale gas.

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