塔里木盆地东北缘孔雀河地区烃源岩演化特征及成藏条件研究

对孔雀河地区3套烃源岩地球化学、热演化参数统计分析表明：寒武系-奥陶系烃源岩分布广、有机质丰度高，演化程度为过成熟；石炭系-三叠系烃源岩主要分布在草湖凹陷，有机质丰度低，热演化程度为中-晚期；侏罗系烃源岩全区分布，有机质丰度高，除英吉苏凹陷部分区域进入生油门限，其它大部分区域热演化程度为未熟-低熟，生排烃量有限。通过对全区13口井单井盆地模拟研究，总结了孔雀河地区3套烃源的3种埋藏热演化模式，即持续深埋型、二次深埋型和早期深埋、晚期浅埋型，和2种生排烃模式，即多段式、单段式。通过生排烃模拟表明，本区生排烃量主要以寒武系-奥陶系烃源岩的生排烃量为主，其它2套烃源岩生烃区域局限且生烃量有限。指出孔雀河地区成藏组合研究应围绕寒武系-奥陶系这套主力生烃源岩生排烃史进行，其具有自生自储、下生上储2种成藏组合模式。综合研究认为寻找寒武系-奥陶系烃源岩主要生排烃期形成的古油藏、分析不同期次构造运动对古油藏破坏程度和研究不同期次断裂系统对油气的疏导、调整作用和对油气分布规律的控制是进一步深化该区勘探的关键。

THERMAL EVOLUTION CHARACTERISTICS OF HYDROCARBON SOURCE ROCKS AND POOL-FORMING CONDITIONS IN THE KONGQUE RIVER AREA,NORTHEASTERN FRINGE OF TARIM BASIN

The geochemical and thermal evolution parametric statistics analyses of three sets of source rocks in the Kongque river area reveal: wide-spreading,high abundance of organic matter and post-mature evolution are the characteristics of the Cambrian-Lower Ordovician hydrocarbon source rocks;the spreading area of the Carboniferous to Triassic hydrocarbon source rocks is very limited,the abundance of organic matter is low and the thermal evolution is during the middle-late periods;the Jurassic hydrocarbon source rocks are wide-spreading and have high abundance of organic matter and immature thermal evolution in the major area,the generation potential of hydrocarbons is limited.From the basin modeling of 13 wells in the area,it has been concluded that there are three kinds of thermal evolutionary patterns,namely,continuous deep burial,secondary deep burial,early-stage deep burial,and late-stage shallow burial,and two kinds of hydrocarbon generation patterns: one-step style and multistage style.There are two kinds of pool-forming associations: self-generation and accumulation,lower generation-upper accumulation.An integrated study shows that the main task for further exploration is to find early-paleo-oil-reservoirs and analyze their destruction in different stages and the controlling rule of rift systems over petroleum distribution.