东营凹陷北带沙四下凝析油气成藏模式与主控因素

The Reservoir Formation Model and Main Controlling Factors of Condensate Oil/Gas Reservoir of the Lower Segment of Es_4 in the Northern Part of the Dongying Sag

本文在已经确立了东营北带沙四下亚段凝析油气藏烃源岩的基础上,通过结合热演化史、古地温史,分析储层流体包裹体的均一温度,确定该区沙四下凝析油气藏存在三个成藏期次,分别为沙三~沙二沉积时期的古油藏形成初期、沙一段沉积末期至馆陶组沉积时期的古油藏形成期、明化镇组沉积时期至今的古油藏裂解及凝析气藏形成期。结合构造发育史建立了沙四下亚段凝析油气藏成藏模式;并分析了本区成藏主控因素。

Based on research on the hydrocarbon sources of condensate oil and gas reservoirs in the lower segment of Es4,in combination with the thermal evolution history and paleo-temperatures of source rocks,through liquid inclusion analysis and homogenous temperature research,it is found that there are three key episodes of oil and gas accumulation in the study area,including the initial stage of formation of plaeo-oil reservoirs starting in the period of depositional stage of Es3 to Es2;the second stage of conformation of plaeo-oil reservoir at the late stage of depositional stage of Es1 to Ng;the process of paleo-oil reservoirs cracking and formation of condensate oil and gas reservoirs since the depositional stage of the Minghuazhen Formation of Neogene.In combination with the development of construction,the formation model of condensate oil gas reservoirs in the lower segment of Es4 was established,and main controlling factors of the reservoirs in the study area were analyzed.