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千米桥潜山构造位于黄骅坳陷板桥构造带，位于该构造的板深7井在奥陶系试油，日产凝析油143．36t，日产天然气275309m^3。这一重大发现标志着大港油田古潜山的油气勘探获得了重大突破。研究结果表明：千米桥潜山具多期成藏的特点；板深4井油气藏受到扩散作用的影响；气侵是形成千米桥潜山凝析油气藏的根本条件，千米桥潜山属于气侵型凝析气藏；气侵还是造成板深7、板深8、板深4井高含蜡的主要原因。

Condensate Reservoir Formation in Qianmiqiao Buried Hill Structure

Qianmiqiao buried hill structure belongs to Banqiao structural belt in Huanghua Depression.Through testing,a condensate production of 143.36t/d and natural gas production of 275309m 3/d was found in Ordovician in well Banshen-7 located at the structure.Such a significant discovery indicates that an important breakthrough has been obtained in the exploration of buried hills in Dagang Oil Field.Through research it is shown that the reservoir in Qianmiqiao buried hill was formed in stages;the reservoir drilled by well Banshen-4 was influenced by diffusional effect;gas invasion is the basic condition of forming Qianmiqiao buried hill condensate reservoir which belongs in the gas-invaded condensate reservoir;and the gas invasion is the major reason of causing the high paraffin-content in wells Banshen-7,8,and 4.