桥口凝析气藏类型及定容衰竭开采特征

桥口凝析气藏位于东濮凹陷黄河南中央隆起带北端，含气层段主要为沙三中亚段和沙三下亚段，具有甲烷含量高、中间烃（C2～C6）含量中偏低、C7＋含量低，挥发油的烃组成具有轻质弱挥发油和较高的体积膨胀能力；综合分析认为，桥口凝析气藏总体上属于中高含甲烷（C1）、中低含中间烃（C2～C6）、中低重质烃的典型凝析气藏，仅在沙三下亚段含气层段中的第6含气层组存在弱挥发性轻质原油，沙三中亚段则存在弱挥发性轻质原油流体；最后分析了桥口凝析气藏的定容衰竭开采特征。

Types of Qiaokou Condensate Gas Reservoirs and Characteristics of Constant-volume and Blowdown

Qiaokou cndensate gas reservoirs are located in the north of central uplift of Dongpu Depression to the south of Yellow River, where gas-bearing zones are in the middle and lower members of Es_3, methane content is high, intermediate hydrocarbon (C_2~C_6) content is middle and slightly lower. C_(7+)content is low, the hydrocarbon composition of volatile oil has the capacity of light and weak for generall volatile oil and high expansion volume. Its integral analysis shows that Qiaokou condensate gas reservoirs are generally the typical gas condensate reservoirs with high content of methane (C_1), intermediate hydrocarbon (C_2~C_6) content is mid-low, and heavy hydrocarbon is mid-low, there exists weak volatile light oil in the sixth gas-bearing zone in the lower member of Es_3, and in the mid member of Es_3 there exist a weak volatile light oil fluid and eventually the characteristics of constent-volume and blowdown of Qiaokou gas condensate reservoir are analyzed.