塔里木盆地北部沙雅隆起含油气系统及勘探靶区选择

PETROLEUM SYSTEM AND EXPLORATION STRATEGY IN SHAYA UPLIFT OF THE NORTHERN TARIM BASIN

沙雅隆起含油气系统可划分为两种类型:南部海相烃源含油气系统和北部陆相烃源含油气系统。两种含油气系统关键时刻、油气藏圈闭类型及发育层位均有各自不同的特点。处于海相含油气系统分布区的塔河地区主要勘探层位集中在侏罗纪以下层位,主要勘探目标是早奥陶世地层不整合-岩溶缝洞型圈闭、石炭纪披覆背斜圈闭、三叠纪背斜-断块圈闭、盐边低幅度背斜圈闭及早石炭世内部岩性-构造复合圈闭等;处于陆相含油气系统分布区的雅克拉—轮台地区的主要勘探层位是侏罗纪以上层位,主要勘探目标是晚第三纪、晚白垩世—老第三纪的构造圈闭、侏罗纪和早白垩世地层圈闭。在亚南断裂与轮台断裂间应重视对下部下古生界碳酸盐岩潜山-披覆背斜圈闭的勘探。

There are two petroleum systems in Shaya uplift: southern one with marine source rocks and the other with terrestrial source rocks in the north. The two systems showed different characteristics in terms of key time, trap types of oil and gas pools, and occurrence. The major plays occurred in sequences older than the Jurassic in marine petroleum system, such as in Tahe area. The exploration targets are dominated by the Lower Ordovician buried hills or overturn anticline, the Triassic anticline  fault block and low amplitude anticline around salt dome, and the Carboniferous composite stratigraphic and structural traps. The major exploration targets in terrestrial petroleum system, such as in Yakela and Luntai areas, are mainly occurred in the Tertiary and Late Cretaceous structural traps and the Jurassic and Early Cretaceous stratigraphic traps. However, some attention should be paid to the Lower Paleozoic buried hills and overturn anticline in the area between Yanan fault and Luntai fault.