二连盆地巴音都兰凹陷烃源岩评价及油源研究

Source Rocks and Oil-Source Rock Correlation in the Bayindulan Sag of Erlian Basin

腾格尔组和阿尔善组是二连盆地巴音都兰凹陷主要的生烃层位。对巴72×井烃源岩评价表明,阿尔善组和腾格尔组烃源岩有机质丰度整体达到中等—好级别,有机质类型以Ⅰ—Ⅱ1型和Ⅱ1—Ⅱ2型为主,但烃源岩成熟度不高,整体处于未成熟—低成熟热演化阶段。原油色谱—质谱图和生标参数对比均表明,阿尔善组原油主要来源于该组烃源岩,为该组自生油气。

Tenggeer formation and Aershan formation are the main source rock in the Bayindulan sag. Eval uation on the source rocks of B72 × well indicates that the organic matter abundance in the source rock of Tenggeer formation and Aershan formation belongs to the medium-good source rock. Its organic matter is mainly Ⅰ-Ⅱ1 type and Ⅱ1 type, but the maturity of hydrocarbon-source rocks is not high, which are wholly on the stage of immature-low mature thermal evolution. The comparisons between the GC-MS map and biomarker parameters demonstrate that the crude oil of Aershan Formation is mainly from its source rock, and belongs to primary petroleum.