泌阳凹陷北部斜坡带王集油田核三下段成藏规律

【摘要】 王集油田位于泌阳凹陷北部斜坡带中段,由于断裂系统发育、多物源砂体相互叠置、地震资料品质较差等因素制约了该区深层系滚动勘探开发。本文通过开展小层细分对比、精细构造解释及新老钻井动静大衣态分析等手段加强了地震地质综合研究,发现与浅层一样,深层油气同样富集在王集宽缓鼻状构造背景之上,但成藏条件明显不同:①深层源于西北张厂三角洲砂体与北东向断裂容易形成复合圈闭,导致油气主要赋存于鼻状构造西翼及轴部南段;②剖面"椅式"、平面"弧形"的北东向断裂系统由于倾角变缓处使断层能够有效封堵,形成油气富集带。根据这一研究成果部署勘探,不但新钻井效果显著,滚动探井成功率高达79%,发现一批新油层,而且老井重新评价,解放了一批油层,新增探明储量430万t,含油面积6.9km2,有效的指导了深层系滚动勘探开发。更多还原

【Abstract】 Rolling exploration for the deep layers at Wangji Oilfield,which located in the middle of the north sloping zone in Biyang Oilfield,is subject to the complicated faults,laminating depositing sources,bad seismic quality and other geological factors.Through intensified and integrated geological and geophysical studies such as stratigraphic correlation,fine structure interpretation,static and dynamic analysis on new and vintage wells,it is ascertained that the hydrocarbons are enriched in the nose-liked structures,the same as the shallow layers at the area.However,the hydrocarbon enrichment pattern is totally different.Firstly,the traps are composite due to NW Zhangchang delta and NE faults, resulting in that the hydrocarbon accumulates at the west wing and the north axis of the nose-liked structure.Secondly,due to the gentle dip,the NE faults that are chair-shaped in seismic section while arc in flat sheet,are effective to seal off the hydrocarbon migration,generating a hydrocarbon enrichment zone.The exploration strategy based on these reservoir accumulation patterns is appropriate in enhancing the success ratio of newly rolling exploratory wells and in finding the neglectful oil horizons in vintage wells.更多还原