千米桥潜山构造凝析气藏的初步分析

千米桥潜山构造位于黄骅坳陷北大港构造带,千米桥潜山构造是在中生代的褶皱-逆冲作用的基础上经历伸展正断作用后形成的.该油气藏为凝析油气藏,油源主要来自板桥凹陷沙河街组三段烃源岩.油气藏含蜡量高,甲烷碳同位素具反转现象,说明其为多期成藏的产物.气侵作用是千米桥潜山气藏形成的主要原因,烃源岩在成熟阶段早期生成的原油以油相形式运移,首先进入千米桥潜山奥陶系储集层中,成熟阶段中期,以气相形式运移形成气藏.

ANALYSIS OF CONDENSATE GAS POOLS IN QIANMIQIAO BURIED HILL

Qianmiqiao buried hill in Banqiao structural belt of Huanghua Depression was formed by stretch-faulting on the basis of fold-obduction.The hydrocarbon pool of the study area is a condensed oil-gas pool, the source rock is the third member of Shahejie Formation. The wax content of the crude oil is high, its methane carbon isotope could be reversed,indicating its multi-stage pool-forming origin. Gas invasion was the main cause of the pool's formation. Crude oil generated in early maturation stage migrated into the Ordoviciom reservoir of the buried hill first,then gas generated in mid maturation stage migrated in gas phase into the reservoir and formed the pool.