桂中坳陷中泥盆统罗富组富有机质泥页岩特征及意义

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—Ⅱ_1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。

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

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.