大牛地气田太原组沉积模式

DEPOSITONAL MODELS OF TAIYUAN FORMATION IN DANIUDI GAS FIELD, ORDOS BASIN

关于鄂尔多斯盆地北部上古生界石炭系太原组的沉积特点,目前存在着多种不同的观点。为满足大牛地气田勘探开发的需要,通过运用高分辨率层序地层学理论和方法,在根据大量钻井资料对大牛地气田上古生界高精度层序地层划分的基础上,系统分析了石炭系太原组地层的沉积特点,并对其沉积演化特征进行了归纳总结,进而建立了太原组海陆过渡相的沉积模式:无障壁海岸—障壁海岸—三角洲平原沉积。

There is still much disagreement over the depositional characteristics of the Carboniferous Taiyuan Formation of Upper Paleozoic in the northern Ordos Basin. In view of the needs of exploration and development in Daniudi gas field, the principles and methodologies of high resolution sequence stratigraphy are used to systematically study the depositional characteristics of the Carboniferous Taiyuan Formation based on highly accurate division of sequences in the Upper Paleozoic in Daniudi gas field with large amount of drilling data. Its features of depositional evolution are summarized and a depositional model of transitional facies is built, i.e. barrierless shore-barrier shore-delta plain.