内蒙古二连盆地上古生界油气勘探前景

Exploration prospect of hydrocarbon of Neopaleozoic in Erlian basin,Inner Mongolia,China

二连盆地晚古生代海相-海陆交互相碎屑岩和碳酸盐岩沉积建造广泛发育，主体未遭受区域变质，暗色泥岩和碳酸盐岩类烃源岩发育良好。地质调查和烃源岩初步分析评价结果表明，该区发育泥鳅河组、本巴图组、阿木山组、寿山沟组、哲斯组、林西组6套烃源岩系和多套有利的生储盖组合，其中的暗色泥岩／灰岩可达到中等-好烃源岩标准，有机质类型属于Ⅱ，Ⅲ型，热演化程度总体处于成熟-凝析油湿气阶段，具有较大的油气资源潜力，可作为二连盆地油气勘探的重要新层系。

In Erlian basin,Neopaleozoic nlarine-paralic elastic and carbonate sedimentary formation developed well. The host formation has no regional metamorphism. The dark mudstone and carbonate source rock well developed. Based on the geological research and the primary analysis and evaluation of source rock, six source formations （Niqiuhe, Benbatu, Amushan,Shoushangou, Zhesi, Linxi） and several profitable source-reservoir-caprock assemblages are determined. The source rock standard of the dark mudstone（lime- stone） is moderate-good. The organic material is classified in Ⅱ2-Ⅲ type. Thermal evolution degree is mature-condensate oil and humidity. The dark mudstone （limestone） is in high potential of hydrocarbon and can be taken as the new crucial exploration formarion in Erlian basin.