2016年2期

湘中涟源凹陷中二叠统小江边组页岩气勘探前景分析

发布时间:2016-09-05阅读次数:

【期数】2016-2

【作者】白云山1,王强1,苗凤彬1,曾雄伟1,曾 平2,路 鹏2

【机构】1.中国地质调查局武汉地质调查中心,武汉 430205;2.湖南省煤田地质局第一勘探队,耒阳 421800

【关键词】湘中;涟源凹陷;中二叠统;小江边组;页岩气

【中文摘要】对湘中涟源凹陷中二叠统小江边组页岩气有利层位进行了地球化学、物性特征分析,结合地质保存条件对小江边组含气页岩层进行综合解析。主要物化指数:TOC介于0.61% ~ 3.98%之间,平均值为1.64%;Ro值范围为1.61% ~ 2.31%,均值为1.88%;有机质类型为Ⅰ型、Ⅱ1型,具有良好的生油生气潜力;脆性矿物含量60% ~ 86%,脆性矿物含量较高;其有效孔隙度为2.81% ~ 4.11%,渗透率为0.00267 ~ 0.00299 mD;厚度主要范围为40 ~ 130 m。小江边组具一定的埋深,主要分布于中部构造带宽缓向斜中,具有较好的页岩气开发前景。

【英文摘要】The analyses on characteristics of physical properties and geochemistry were taken on the favorable horizon of the shale gas of the Permian Xiaojiangbian Formation of the Lianyuan Depression in Central Hunan Province, and a comprehensive interpretation was made together with the geological conditions. The results show that the total organic content(TOC) is between 0.61% ~ 3.98%, with the average of 1.64%; organic material maturity(Ro)varies between 1.61% ~ 2.31%,with the average of 1.88%; the main organic type is I andⅡ1, with a good potential for oil and gas. Brittleness mineral accounts for 60% ~ 86%, which could be considered high;The effective porosity is 2.81% ~ 4.11%, and the permeability is 0.00267 ~ 0.00299 mD.The thickness varies between 40m ~ 130m. The Xiaojiangbian Formation buried in depth, mainly distributes in the trapped syncline of the central structural belt,with bright prospects of shale gas development .

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