黄骅坳陷南区油气分布规律及其成藏机制

从渤海湾盆地黄骅坳陷南区油气聚集特征出发,通过研究其成藏条件及主干断层各时期的发育特点,系统分析了油源断层对油气聚集的作用机理.研究认为,长期发育的油源断裂及主伸展层中的次级断层活跃期的"地震泵"作用是黄骅坳陷南区油气聚集的主要成藏动力."地震泵"源控制油气的平面分布位置,而"地震泵"源及主伸展层产生的"次级地震泵"源则联合控制油气运聚层位.地震泵作用区附近的储集层及圈闭是最有效的油气聚集部位,孔二段油藏主要分布于孔西断层西南部尾端、孔西及风化店断层中部断距骤减处、孔东断层两端断距及走向发生突变处等,孔一段上段为主伸展层,聚集了大量的油气.图5表1参25

Distribution and accumulation of the oil and gas in southern Huanghua Depression

On the basis of oil and gas distribution in southern Huanghua Depression, the hydrocarbon accumulation conditions and developing characteristics of the main faults in different stages are researched. The mechanism of source faults accumulating hydrocarbon is analyzed. The seismic pumping mechanism of long-term developing source faults is the main driving force of hydrocarbon accumulation. The sources of seismic pumping control the horizontal distribution of hydrocarbons, while the sources of seismic pumping and the secondary seismic pumping sources produced by the main tensional layer control the lengthways accumulation of oil and gas. The reservoir sands or oil traps near the seismic pumping region might be the most efficient fields for hydrocarbon accumulation. Hydrocarbons sourced from the second member of the Kongdian Formation are mainly distributed at the southwestern tail of the Kongxi fault and the fault rapidly decreased displacement or the abruptly changed strike of the Kongxi, Fenghuadian and Kongdong faults. The main tensional layer of the upper part of the first member,Kongdian Formation accumulates large quantities of oil and gas.