千米桥潜山凝析气藏是20世纪末大港油田发现的规模较大的中等凝析油含量的凝析气藏,含油气目的层为奥陶系峰峰组和上马家沟组。该藏投入试采之后,初期产量较高,但压力和产量递减较快、各井间流体组成差异较大(主要表现在各井出水量及水气比变化规律不同)。通过对产出水的矿化度和水气比变化规律分析和溶解水与溶解气比实验研究证明,千米桥潜山生产井板深8井产出水以凝析水为主,而板深7井则存在游离形式的底水。

Qianmiqiao buried hill was found in the end of 20th century in Dagang oil field, which is a big north inclination monoanticline structure limited by three boundary faults with moderate condensate oil content. The target zones are Fengfeng group and Majiagou group of Ordovician system. At the beginning, the yield was higher, but the pressure and production were lapsed sharply. There are more differences among wells . The liquid compose was studied from the content of condensate oil, WGR and dissolved WGR experience.