惠安堡-马家滩上古生界烃源岩及含油气系统

Upper paleozoic source rocks and related petroleum systems in Huianbu and Majiatan areas

目的建立鄂尔多斯盆地西缘惠安堡—马家滩地区上古生界含油系统,为寻找油气聚集区提供理论依据。方法采用岩石热解、储集层评价、沉积环境划分等方法对研究区上古生界埋藏史、热演化史进行恢复。结果研究区的成藏模式包括源内式、近源式及远源式3种,具有多源、多灶、多阶段生烃、多期成藏的特点,为复合含油气系统。结论二叠系的煤系烃源岩已进入生气阶段;早白垩世末是上古生界最重要的排气期及天然气运聚期,是复合含油气系统的关键时刻。

Aim To set up the petroleum system of Upper Paleozoic in the west margin of Ordos Basin.To prove the method for finging out hydrocarbon accumulation zone.Methods Use the way of Rock-Eval pyrolysis,reservoirs,sedimentary environment,etc.to recover the burial history and thermal history for Upper Paleozoic.Results The reservoir formation model includes such 3 types as in-source,near-source and remote-source.This petroleum system has such characteristics as multiple sources,gas generation and accumulation in multiple stages,and belongs to a compound petroleum system.Conclusion C-P coal argillaceous rocks form its source rock,and has turned into gas-generation stage.The end of early Cretaceous is the most important stage for gas expelled,migration and accumulation,and is the key period of this compound petroleum system.