阿尔及利亚页岩油气资源潜力分析

An analysis of shale gas and oil resource potential for Algeria

阿尔及利亚具有良好的页岩油气资源潜力,是值得关注的重要领域,但页岩油气相关研究较为薄弱。根据地质条件的差异性,将撒哈拉地台分为西部盆地群和东部盆地群,对比分析页岩油气分布特征,刻画主要盆地页岩气资源特征;利用页岩气有利区多因素叠加法,分析页岩油气资源分布有利区。研究认为,阿尔及利亚主要发育下志留统Tannezuft页岩和中上泥盆统Frasnian页岩两套富有机质页岩,两套富有机质页岩厚度展布呈现为"西厚东薄"的特征,与之相应有机质成熟度也表现为"西高东低",有机质丰度则呈现"东高西低"。下志留统Tannezuft页岩与我国南方中上扬子地区志留系龙马溪组页岩类似,具有分布范围广、富有机质页岩厚度大、有机质含量高、成熟度适中的特征,页岩气分布有利区主要位于廷杜夫盆地中部、贝沙尔盆地、蒂米蒙盆地北部、韦德迈阿盆地西部、古德米斯盆地中部、伊利兹盆地中部,页岩油分布有利区主要位于蒂米蒙盆地南部、韦德迈阿盆地北部、古德米斯盆地北部;中上泥盆统Frasnian页岩具有分布局限、富有机质页岩厚度大、有机质含量高、成熟度较低的特征,页岩中上泥盆统Frasnian页岩气分布有利区主要位于廷杜夫盆地-雷甘盆地中部、贝沙尔盆地-蒂米蒙盆地-阿赫奈特盆地中部、伊利兹盆地,页岩油分布有利区主要位于韦德迈阿盆地-莫伊代尔盆地中部、古德米斯盆地。页岩气分布有利区全区分布,页岩油分布有利区则主要位于东部盆地群。

Algeria has a good shale oil and gas resources potential,which is an important area of shale exploration,but related research is relatively weak.According to the difference of geological conditions,the Sahara platform is divided into western basins and eastern basins,analyzed and compared the characteristics of shale oil and gas distribution,described the characteristics of shale gas resources in the main basin.By the multi-factor superposition method of shale gas favorable area,analyzed the favorable distribution of shale oil and gas resources.The study found that the Algerian development two sets of rich organic shale(Silurian Tannezuft shale and the upper middle Devonian Frasnian shale),and the thickness distribution appears as the ' western thick and eastern thin',the corresponding organic matter maturity expressed as ' western high and eastern low',organic matter abundance is ' eastern high and western low'.The Lower Silurian Tannezuft shale is similar to the shale of the Longtaxi Formation in the middle and upper Yangtze region of China.It has characteristics of wide range distribution,rich organic shale thickness,high organic matter content,moderate maturity,and the shale gas distribution favorable area is located in Central Tindouf Basin,Bechar Basin,Northern Timimoun Basin,Western Oued Mya Basin,Central Ghadames Basin,Central IlliziBasin,and the shale oil distribution favorable area is located in Southern Timimoun Basin,Northern Oued Mya Basin,Northern Ghadames Basin.The upper middle Devonian Frasnian shale has characteristics of limited distribution,rich organic shale thickness,high organic matter content,low maturity,and the shale gas distribution favorable area is located in Central Tindouf Basin-Reggane Basin,Central Bechar BasinTimimoun Basin-Ahnet Basin,Illizi Basin,and the shale oil distribution favorable area is located in Central Oued Mya Basin-Mouydir Basin,Ghadames Basin.The shale gas favorable area distributed in all region,the shale oil favorable area mainly distributed in eastern basins.