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| 黔南地区下寒武统牛蹄塘组页岩气顶底板特征研究 |
| 门玉澎1,2,闫剑飞1,2,戚明辉3,熊国庆1,2,马龙1,2,杨菲1,2,康建威1,2 |
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(1. 中国地质调查局成都地质调查中心, 四川 成都 610081;
2. 沉积盆地与油气资源重点实验室, 四川 成都 610081;
3. 四川省科源工程技术测试中心, 四川 成都 610071) |
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| 摘要: |
| 下寒武统牛蹄塘组顶底板条件是评价区域页岩气保存条件的重要因素之一。本研究在对黔南地区地表剖面和钻井资料分析的基础上，将该区域牛蹄塘组底板按岩性分为溶孔白云岩区、硅质岩-白云岩混合区和硅质岩区三个岩性组合类型区。硅质岩区具有超低孔、超低渗、高突破压力的特征，对页岩气的封存效果好，底板条件好；硅质岩-白云岩混合区由于白云岩具有溶蚀孔洞且低突破压力的特征，对上部页岩气封堵效果较差，底板条件较差；溶孔白云岩之上存在的暴露不整合面是页岩气散失重要通道，底板条件差。顶板按岩性分为泥岩区和灰岩区，其中泥岩区具有低孔、低渗、高突破压力的特征，顶板条件好，灰岩区次之。以底板为主控因素，综合顶板条件，综合研究结果认为岑巩-三都以东地区顶底板条件好，瓮安-福泉以西顶底板条件较差。黔南地区经历多期次构造运动，泥岩、硅质岩、灰岩在构造抬升改造后易产生裂缝，使得其对页岩气封盖能力变差，提出瓮安-福泉以东构造稳定区是牛蹄塘组页岩气顶底板条件较有利区。 |
| 关键词: 黔南 页岩气 顶底板 突破压力 硅质岩 |
| DOI：10.19826/j.cnki.1009-3850(2020)01-0053-07 |
| 附件 |
| 投稿时间：2019-10-09修订日期：2020-01-10 |
| 基金项目:中国地质调查局“贵州凯里-都匀地区页岩气地质调查冶（DD20190722）资助。 |
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| Effects of bottom and top layers of Niutitang Formation on preservation of shale gas in southern Guizhou |
| MEN Yupeng1,2, YAN Jianfei1,2, QI Minghui3, XIONG Guoqing1,2, MA Long1,2, YANG Fei1,2, KANG Jianwei1,2 |
(1. Chengdu Center, China Geological Survey, Chengdu, Sichuan 610081, China;
2. Key Laboratory of Sedimentary Basin and Oil and Gas Resources, Ministry of Natural Resources, Chengdu, Sichuan 610081, China;
3. Sichuan Keyuan Engineering Technology Testing Center, Chengdu, Sichuan 610081, China) |
| Abstract: |
| Lithology of the bottom and top layers of the Lower Cambrian Niutitang Formation plays an important role in evaluating the preservation conditions of shale gas in southern Guizhou. Based on outcrops and drilling data of the bottom layers of the Niutitang Formation, the studied area can be divided into the dolomitic rock zones, the mixed siliceous-dolomitic rock zones and the siliceous rock zones. Due to its ultra-low porosity, ultra-low permeability and high breakthrough pressure, siliceous rock is the best bottom layers for the preservation of shale gas. According to outcrops and drilling data of the top layers of the Niutitang Formation, the studied area can be divided into mudstone zones and limestone zones. The mudstone zones with low porosity, low permeability and high breakthrough pressure, so they are better than the limestone zones in the preservation of shale gas. Eastern Cengong-Sandu region is the most favorable area for exploring shale gas because of its siliceous rock bottom layers and mudstone top layers. |
| Key words: shale gas bottom layer top layer breakthrough pressure siliceous rock |