摘要
塔里木盆地北部塔河大油田是我国第一个古生界大油田。它是1990～1997年发现的,2002年已控制含油气面积约1000km2,已获探明油气储量为2.5×108t。它的发现对塔里木盆地乃至全国寻找这一类型油气田具有重要指导意义,笔者论述了塔里木大油田的沉积是属古克拉通盆地坳陷型的海相碳酸盐岩;它处于克拉通古隆起—沙雅隆起上,而且断裂和区域性不整合十分发育,有利于油气富集;由于它南邻满加尔生油坳陷,成为油气运移的指向区;经海西期两次构造运动造就了本区奥陶系古岩溶十分发育,形成了孔-洞-缝良好的储集体。并有4期油气运聚和成藏过程等是形成大油气的基本条件。预测该油田可形成8×108～10×108t的特大型油田。
The Tahe oilfield in the northern part of the Tarim basin is China's first largest Paleozoic oilfield.It was discovered from1990to1997.By2002a petroleum-bearing area of^1000km2was controlled,with explored reserves of250million tons.Its discovery has great significance for guiding the search for this type of oilfield in the Tarim basin and even the whole of China.The author thinks that sediments in the Tarim oilfield are depression-type marine carbonate rocks in the ancient cratonic basin.It is located in a cratonic paleo-uplift-Shaya uplift,where faults and regional unconformities are very well developed,which are favorable for the concentration of oil and gas.As it adjoins the Manjiar oil-generating depression on the south,it is a good vector area for oil and gas migration.Two Hercynian tectonic movements resulted in the development of Ordovician paleokarst,thus giving rise to reservoirs with good pores,caves and fissures.Moreover,the occurrence of four phases of oil and gas migration and accumulation is the basic condition for the formation of a large oil/gas field.This oilfield is expected to become an exceedingly large oilfield with oil reserves of800million to1billion tons.
出处
《中国地质》
CAS
CSCD
2003年第3期315-319,共5页
Geology in China
