| 南盘江坳陷东兰地区下石炭统鹿寨组页岩气成藏条件及有利区预测 |
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| 引用本文： | 王劲铸,李小刚,徐正建,辛云路,李昭,李仪汶.南盘江坳陷东兰地区下石炭统鹿寨组页岩气成藏条件及有利区预测[J].地球科学,2021,46(5):1814-1828. |
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| 作者姓名： | 王劲铸 李小刚 徐正建 辛云路 李昭 李仪汶 |
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| 作者单位： | 中国地质调查局油气资源调查中心,北京 100083;重庆科技学院复杂油气田勘探开发重庆市重点实验室,重庆 401331;成都理工大学油气藏地质及开发工程国家重点实验室,四川成都 610059;重庆科技学院复杂油气田勘探开发重庆市重点实验室,重庆 401331 |
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| 基金项目： | 中国地质调查局项目DD20160182油气藏地质及开发工程国家重点实验室（成都理工大学）开放基金资助项目PLC2020020重庆市自然科学基金面上项目cstc2020jcyj-msxmX0487国家自然科学基金青年项目42002167 |
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| 摘 要： | 南盘江坳陷是四川盆地外围海相页岩气勘探战略突破区，具有巨大的勘探潜力，但其页岩气勘探起步晚、勘探方向不明确，严重制约了该区页岩气勘探开发.本次研究以南盘江坳陷东北缘东兰地区野外考察为基础，结合有机地球化学、全岩X衍射、扫描电镜等分析手段，分析了下石炭统鹿寨组泥页岩分布特征、源岩地球化学、储层物性特征、页岩气保存等成藏条件.研究表明:南盘江坳陷东北缘下石炭统鹿寨组泥页岩沉积厚度主要为250~350 m，埋深主要介于1 000~3 000 m；页岩有机碳含量多数大于2.0%，有机质主要为Ⅱ1~Ⅱ2型干酪根，处于高成熟-过成熟阶段，具备良好的供烃能力；页岩储层中脆性矿物含量高，孔隙空间发育良好，吸附性好，页岩气储集能力良好；页岩粘土矿物相对较高，成岩期压实、胶结作用较强，使页岩层自封闭性增强，保存条件较好；多期构造运动对后期页岩气保存与否具有决定性作用.对比国内外典型页岩气田成藏条件特征，认为南盘江坳陷东北缘下石炭统鹿寨组具备有利的页岩气成藏条件，提出南盘江坳陷东兰地区东北部为页岩气有利勘探区.
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| 关 键 词： | 页岩气 鹿寨组 成藏条件 有利区 南盘江坳陷 油气地质 |
| 收稿时间： | 2020-09-06 |
Shale Gas Accumulation Conditions and Favorable-Zone Prediction in Lower Carboniferous Luzhai Formation in Donglan Area of Nanpanjiang Depression,China |
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| Wang Jinzhu,Li Xiaogang,Xu Zhengjian,Xin Yunlu,Li Zhao,Li Yiwen.Shale Gas Accumulation Conditions and Favorable-Zone Prediction in Lower Carboniferous Luzhai Formation in Donglan Area of Nanpanjiang Depression,China[J].Earth Science-Journal of China University of Geosciences,2021,46(5):1814-1828. |
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| Authors: | Wang Jinzhu Li Xiaogang Xu Zhengjian Xin Yunlu Li Zhao Li Yiwen |
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| Abstract: | Nanpanjiang depression, proved to be one of the strategic exploration zones of marine shale gas in periphery of Sichuan basin, possesses a huge shale gas potential. However, the shale gas exploration in Nanpanjiang depression has been restricted seriously, mainly for the late start of shale gas exploration and non-clear target selection. Based on the field investigation and previous studies in northeastern Nanpanjiang depression, the Lower Carboniferous Luzhai shale distribution was ascertained. According to the organic geochemistry, X-ray diffraction, and scanning electron microscopy (SEM), the source rock geochemical characteristics, shale reservoir characteristics, and shale gas preservation conditions were analyzed. The study shows that the thickness of Luzhai shale in northeastern Nanpanjiang depression is mainly 250-350 m, and the burial depth of the shale is mainly 1 000-3 000 m. The TOC values of the Luzhai shale are mainly >2.0%, and the kerogen types are mainly Type Ⅱ1-Ⅱ2. The organic matters in shale mainly reach the high-to over-mature stage, suggesting that the shale should possess an excellent source rock potential. The contents of brittle minerals in the Luzhai shale are relatively high, and the pore spaces in the shale and the adsorption capacities of shale are well developed, indicating a well-developed shale gas reservoir. The high content of clay minerals and relatively strong compaction and cementation in the shale strengthened the relatively strong self-seal capacity of shale, indicating good preservation conditions for shale gas. Multi-episodes tectonic movements played an important role on the shale gas preservation. Compared with accumulation conditions of the typical shale gas in domestic and foreign basins, the Luzhai shales in the northeastern Nanpanjiang depression possess favorable accumulation conditions for shale gas, suggesting the northeastern part of Donglan area in the Nanpanjiang depression should be a favorable shale gas exploration zone in South China. |
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