渤海湾盆地富油气凹陷隐蔽油气藏勘探

EXPLORATION OF SUBTLE RESERVOIR IN PROLIFIC DEPRESSION OF BOHAI BAY BASIN

富油气凹陷的理论实质就是在那些烃源岩发育、资源丰度高、油气十分富集的凹陷中 ,树立满凹含油的思想 ,寻找不仅包括正向构造带中的油气藏 ,更重要的是寻找负向构造带中的油气藏 ,特别是各种隐蔽性油气藏。区内隐蔽油气藏的类型多种多样 ,不仅有岩性油气藏、地层油气藏 ,还有火成岩油气藏及潜山油气藏等 ,储量十分丰富 ,占研究区已探明总储量的近 4 0 。已发现的东营、沾化、辽西、辽东、大民屯、饶阳、歧口板桥等富油气凹陷中 ,资源丰度高、规模大的隐蔽油气藏十分发育 ,勘探潜力巨大。深潜山、洼陷带浊积岩体、陡坡带砂砾岩体、沙河街组三段及中生代火山岩、缓坡带水进超覆三角洲砂体。

The theory of prolific depression is essentially to let us have an idea of 'depression fully filled with oil and gas' namely,the depression with rich source rocks,high resource abundances,enriched-oil and gas,and to search for not only reservoirs in positive structural zone,but also more important to search for reservoirs in negative structural zone as well,and to search for different subtle reservoirs in particular. There are various subtle reservoirs such as lithologic reservoir,stratigraphic reservoir,especially as well as volcanic rock reservoir and buried hill reservoir etc.,the reserves of which making up almost 400/0 of the total proved reserves in the study area.The prolific depression in Dongyang,Zhanhua,Western and Eastern Liaoning,Damintun,Raoyang,Qikou and Banqiao etc.have been discovered with high resource abundances,and large well-developed subtle reservoirs with great potential for the exploration of oil and gas. Deep buried hill,turbidite body in the sag zone,sand body in the steep gradient zone,the third member from Shahejie - Formation and the Mesozic volcanic rock,water encroachment overlapping delta sand body in the gentle slope zone as well as complex subtle blocks etc.are believed to be major projecting areas for the exploration of oil and gas in prolific subtle reservoirs.