东营凹陷中央构造带东部沙一段油气藏成藏规律研究

Study on hydrocarbon accumulation in East s_1 of the central structure belt in Dongying depression

对东营凹陷中央构造带东部沙一段进行研究,分析了该区东辛油田沙一段油藏的成藏控制因素、油气藏分布特点,总结油气藏成藏规律。认为东辛油田沙一段三面邻洼的优越油气源条件为其成藏提供了良好的物质基础,中央构造带独特的塑性拱张背斜为油气运移提供了良好的运移通道,复杂多样的构造样式形成了多种圈闭类型,稳定发育的湖相碳酸盐岩为油气聚集提供了储集空间,多套良好的封盖层则有利于油气的保存,而局部断裂活动对沙一段油气藏具有明显的破坏作用,油气藏的形成与断层封闭性关系密切。

This paper studies the East s_1 of the central structure belt in Dongying depression,analyzes the con- trolling factors of hydrocarbon accumulation and reservoir distribution features in s_1 of Dongxin Oilfield,and sum- marizes the law of hydrocarbon accumulation.Source sags located on three sides around s_1 of Dongxin Oilfield had provided material supply for hydrocarbon accumulation,the unique plastic arch anticline in the central struc- ture belt had provided path for hydrocarbon migration,complicated and diversified structural styles had generated various trap types,extensive lacustrine carbonate rock had provided reservoir space for hydrocarbon accumula- tion,multi -seal had contributed to hydrocarbon preservation,local fracturing movement had played an adverse role to s,reservoir,and hydrocarbon accumulation is closely related to fault seal ability.