黔西南地区二叠系梁山组页岩气勘探潜力研究

Study on Permian Liangshan Formation Shale Gas Exploration Potential in Southwestern Guizhou Area

二叠系梁山组是黔西南地区页岩气资源调查评价工作过程中发现的重要页岩层系,发育于梁山组底部的黑色页岩为该层系的有利勘探目标层段。通过对区域地质调查、钻井、岩心样品等资料的分析,利用扫描电镜、XRD、等温吸附等手段对所采样品进行测试分析,结合实验结果和所掌握资料综合研究分析,发现梁山组黑色页岩沉积厚度大(最厚可达168.8m)、有机质丰度较高(TOC值为0.14%~4.10%)、热演化程度适中(Ro值为0.95%~2.71%)、有机质类型以Ⅱ型为主、微裂缝发育、脆性矿物丰富、埋深适中。与成功勘探开发页岩气的北美页岩相比,梁山组页岩气成藏条件良好,是较理想的页岩气勘探目的层系。黔西的六盘水-晴隆地区较大的页岩沉积厚度及明显的含气显示特征,预示着该区二叠系梁山组具有较大的页岩气勘探潜力。

The Permian Liangshan Formation is an important shale set found during the process of shale gas resources investigation and assessment in southwestern Guizhou area. The black shale developed at the bottom of Liangshan Formation is favorable exploration tar- get in the set. Based on the analysis of regional geological surveying, drilling, core samples data, carried out test and analysis of sam- ples taking using SEM, XRD, and isothermal adsorption means. Combined with tested results, integratively studied and analyzed grasped data have found that the black shale has large thickness （maximum 168.8m） , higher organic matter abundance （TOC 0. 14% -4. 10% ） , thermal evolution degree moderate （Ro 0. 95% -2. 71% ） , type of organic matter mainly type II, microfissures well developed, brittle minerals abundant and buried depth moderate. Compared with the shale gas successfully exploiting north American shale, the Liangshan Formation has excellent shale gas reservoiring condition, thus an ideal shale gas exploration target set. The larger shale depositional thickness and obvious gas indication features from the Lupanshui - Qinglong district in western Guizhou area have indicated the Permian Liangshan Formation in the area has superior shale gas exploration potential.