【作者】 王友净； 林承焰； 董春梅； 薛玖火；

【Author】 WANG You-jing;LIN Cheng-yan;DONG Chun-mei;XUE Jiu-huo;College of Geo-resources and Information,China University of Petroleum;

【机构】 中国石油大学地球资源与信息学院；

【摘要】 目的以典型的地层不整合稠油油藏乐安油田为例,分析缓坡带稠油油藏的沉积特征。方法在岩心观察的基础上,从区域地质、地震相、岩相、微观特征等方面综合分析。结果缓坡带储层特征和原油性质受沉积特征、不整合、基底大断层、火山活动及埋藏浅等因素控制,乐安油田E_S4油藏段显示出高黏、强敏感性特征;E_S4上、下亚段对应于两个层序,其岩石矿物学特征不同,沉积特明显不同;沙四上亚段显示出滨浅湖滩坝的沉积特征,而沙四下亚段为水下冲积扇沉积,储量占95%。结论东营凹陷在下第三纪沙河街组沉积演化时期于南部缓坡带形成了各种成因类型的砂体,沉积特征控制着储层的含油气性;受多种因素的控制,原油性质显示出高黏特性。更多还原

【Abstract】 Aim Taken the typical stratigraphic unconformity heavy oil reservoir-Le’an Oilfield as an example,this paper analyzed the sediment characteristics of heavy oil reservoir at the gentle slope zone.Methods Analyzed synthetically from areal geology,seismic facies,lithology facies,micro-characteristics based on core observation.Results The factors including sediment character,unconformity,big basement fault,volcano activity and shallow embedding synthetically control the reservoir character and oil property.This reservoir shows high viscosity and strong sensitivity.The upper,lower formation of Es₄ correspond two sequences respectively,which have different lithology mineral and sediment character.The upper formation of Es₄ develops beach and bar facies,but the lower develops the submarine alluvial fan.The reserves of the lower formation of Es₄ account for 95 percent.Conclusion It was formed all kinds of cause type sandbodies during the Lower Tertiary period of Shahejia sediment evolution on the gentle slope zone of Dongying Depression.The sediment character controls the hydrocarbon potential of reservoir rock.Controlled by all kinds of the factors,the crude oil property shows the property of high viscosity.更多还原