桂中坳陷中泥盆统罗富组富有机质泥页岩特征及意义

Shale gas characteristics of organic-rich shale in Luofu Formation in Guizhong Depression

张子亚 魏家琦 石砥石 覃英伦 赵应权 庞春雨 刘洋

ZHANG Ziya WEI Jiaqi SHI Dishi QIN Yinglun ZHAO Yingquan PANG Chunyu LIU Yang

1. 中国地质调查局油气资源调查中心, 北京 100083; 2. 中国地质调查局非常规油气地质重点实验室, 北京 100029; 3. 成都理工大学沉积地质研究院, 成都 610059

1. Oil & Gas Survey Center, China Geological Survey, Beijing 100083, China; 2. Key Laboratory of Non-conventional Oil and Gas Geology, China Geological Survey, Beijing 100029, China; 3. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China

通过全岩X衍射、黏土矿物X衍射、有机地球化学特征分析，研究桂中坳陷中泥盆统罗富组富有机质泥页岩特征。该泥页岩主要发育于台盆环境，岩性主要为黑色泥页岩、碳质页岩、硅质页岩和硅质泥页岩；鹿寨南部有机碳含量最高超过2.55%，合山-上林一线西北部最高超过3.0%；有机质类型为Ⅰ-Ⅱ1型为主的混合型，生烃潜力较大，热演化程度高，具备页岩气藏发育的良好地质条件。页岩气富集因素分析表明，南丹-天峨一线与合山附近区域页岩气聚集条件较优越，是桂中坳陷中泥盆统罗富组页岩气勘探开发的有利区域。

The characteristics of organic-rich shale in the Middle Devonian Luofu Formation in the Guizhong Depressionwere studied using whole rock and clay mineral X-ray diffraction, and organic geochemical analyses. The shale was deposited as a black mud shale, carbonaceous shale, siliceous shale and siliceous mud shale. The organic carbon content in the southern Luzhai is higher than 2.55%, and the highest value in the northwest of Heshan-Shanglin is above 3.0%. The organic matter is mainly mixed types I and Ⅱ1, which showed a great hydrocarbon generation potential and a high thermal evolution degree. The analysis of shale gas enrichment factors indicated that the regions close to Nandan-Tian'e and Heshan were favorable for shale gas accumulation, which were exploration targets in the Middle Devonian Luofu Formation in the Guizhong Depression.

国家科技重大专项“页岩气资源评价方法与勘查技术攻关”（2016ZX05034）和中国地质调查局二级项目“滇黔桂地区上古生界海相页岩气基础地质调查项目”（121201021000150011）联合资助。

https://doi.org/10.11781/sysydz201901016