| 江苏省下志留统黑色页岩浅井钻探及其页岩气潜力分析 |
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| 引用本文： | 贾东,胡文瑄,姚素平,尹宏伟,李一泉,王文卉,周启友,吴晓俊.江苏省下志留统黑色页岩浅井钻探及其页岩气潜力分析[J].高校地质学报,2016,22(1):127. |
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| 作者姓名： | 贾东 胡文瑄 姚素平 尹宏伟 李一泉 王文卉 周启友 吴晓俊 |
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| 摘 要： | 近年来上扬子地区下志留统龙马溪组页岩气勘探开发取得重大突破,属于同一大地构造单元的下扬子地区,其页岩气资源潜力和勘探前景问题日益受到关注。在下扬子地区与龙马溪组层位相当的高家边组,由于地表风化程度较强和出露情况较差等因素,其黑色页岩的分布范围和沉积厚度不甚清楚,直接影响了对下扬子地区页岩气勘探潜力的评价和预测。为此本次研究选择在江苏省南京汤山和句容仑山两地实施黑色页岩浅井钻探。基于5口钻井的岩芯提取,从黑色页岩厚度、地化、岩矿和生物地层学等多个方面揭示了下扬子地区五峰组—高家边组黑色页岩基本特征。分析结果表明:该地区黑色页岩与上扬子焦石坝地区有很好的对比性,至少有4个笔石化石带相互一致。五峰组—高家边组黑色笔石页岩厚度在汤山地区大于80.5 m,仑山地区至少39.5 m,有机质丰度较高,多数TOC含量1.2%~4%,显示了较强的生烃能力。镜质体反射率(Ro)主要在1.5%~2.6%之间,热演化程度以高—过成熟为主,进入生气阶段。黑色页岩有机质以干酪根Ⅰ、Ⅱ1型为主。因此,认为下扬子地区下志留统黑色页岩具有良好的页岩气资源潜力。
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| 关 键 词： | 下扬子地区 页岩气 下志留统黑色页岩 浅井钻探 潜力 |
Shallow Borehole Drilling of the Lower Silurian Black Shale in Jiangsu Province and the Shale Gas Potential Analysis |
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| JIA Dong,HU Wenxuan,YAO Suping,YIN Hongwei,LI Yiquan,WANG Wenhui,ZHOU Qiyou,WU Xiaojun.Shallow Borehole Drilling of the Lower Silurian Black Shale in Jiangsu Province and the Shale Gas Potential Analysis[J].Geological Journal of China Universities,2016,22(1):127. |
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| Authors: | JIA Dong HU Wenxuan YAO Suping YIN Hongwei LI Yiquan WANG Wenhui ZHOU Qiyou WU Xiaojun |
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| Abstract: | The shale gas exploration of the Longmaxi formation in the Lower Silurian in the upper Yangtze region obtained great
breakthrough in recent years. More and more attention is focused on the shale gas resource potential and exploration prospect in the
lower Yangtze zone, which is in the same tectonic block with the upper Yangtze. The Gaojiabian formation in the lower Yangtze is the
equivalent layer of the Longmaxi formation in the upper Yangtze. Due to the strong erosion on the surface and the bad exposure, the
distribution and the thickness of the black shale rock are unclear, which restrict the evaluation and prospection of the shale gas
exploration potential. In this respect, this study performed the shallow well drilling project for the black shale in the Tangshan in
Nanjing and Lunshan in Jurong. On basis of the analysis of the cores from these 5 boreholes, this study revealed the characteristics of
the black shale, including the thickness, geochemical features, petrology, and biostratigraphy. The results suggest that the black shale
is well comparable with the Jiaoshiba in the upper Yangtze and that at least 4 graptolite fossil zones are consistent with each other. The
thickness of the Wufeng-Gaojiabian black graptolite shale is larger than 80.5 m in Tangshan zone, and larger than 39.5 m in Lunshan.
The organic abundance is relatively high. The TOC content is from 1.2% to 4%, which implies relative strong hydrocarbon generation
capacity. The Ro ranges from 1.5% to 2.6%, which indicates the thermal evolution degree is high-over mature. The hydrocarbon
entered the gas generation stage. The organic pattern of the black shale is mainly kerogen Ⅰ and Ⅱ1. Therefore, we considered the
lower Silurian shale has good shale gas resource potential in the lower Yangtze zone. |
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| Keywords: | Lower Yangtze shale gas Lower Silurian black shale shallow borehole drilling potential |
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