乐安油田草4块沙三段—沙二段储层沉积特征与非均质性研究
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摘要
利用地震、钻井、测井、岩心资料,对乐安油田草4块沙三段—沙二段储层的沉积特征与非均质性及隔层和夹层对特稠油油藏开发的影响进行了研究,发现储层沉积特征和非均质性是影响该单元特稠油构造-地层油藏开发生产的重要因素。研究区沙三段—沙二段为辫状河三角洲前缘亚相沉积,水下分流河道和河口坝是储层分布的主体相带。储层层内、层间非均质性强,平面非均质性较弱,砂体连通性较好。隔层和夹层主要为沉积成因,纵向上沙三段隔层和夹层较沙二段不发育,构造高部位因剥蚀造成隔层缺失,水下分流河道部位因冲刷造成隔层不发育。隔层和夹层的平面、垂向分布特征对特稠油油藏注蒸汽热采具有直接影响,沙三段2和3小层的顶底隔层发育,其内部的夹层不发育,应作为主要的提高采收率热采层段。
The reservoir sedimentary characteristics and heterogeneity of the second and third members of Shahejie formation in block Cao4, Le'an oilfield have been studied herein based on seismic, drilling, logging and coring data. The results show that, reservoir sedimentary characteristics and heterogeneity dominate the structural-stratigraphic reservoir production of super -heavy oil significantly. The second and third members of Shahejie formation in studied area belong to braided river delta deposits with chief facies belts of distributary channel and mouth bar. Their inner and inter heterogeneity are very strong with interbeds caused by sedimentation. The third member of Shahejie formation is less developed than the second one in the vertical direction. And, interbeds in the highs lack because of denudation and in the distributary channel for erosion. Both the planar and vertical distribution of interbeds controls the thermal production of super-oil reservoir by steam injection directly. The second and third members of Shahejie formation become the favorable targets for limited interbeds inside and steady barrier beds both on the top and bottom.
The reservoir sedimentary characteristics and heterogeneity of the second and third members of Shahejie formation in block Cao4, Le'an oilfield have been studied herein based on seismic, drilling, logging and coring data. The results show that, reservoir sedimentary characteristics and heterogeneity dominate the structural-stratigraphic reservoir production of super -heavy oil significantly. The second and third members of Shahejie formation in studied area belong to braided river delta deposits with chief facies belts of distributary channel and mouth bar. Their inner and inter heterogeneity are very strong with interbeds caused by sedimentation. The third member of Shahejie formation is less developed than the second one in the vertical direction. And, interbeds in the highs lack because of denudation and in the distributary channel for erosion. Both the planar and vertical distribution of interbeds controls the thermal production of super-oil reservoir by steam injection directly. The second and third members of Shahejie formation become the favorable targets for limited interbeds inside and steady barrier beds both on the top and bottom.
引文
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[3]贾光华,李秀华,李小梅.东营凹陷南坡东段沙三段沉积体系分析及油气成藏规律研究[J].油气地质与采收率,2004,11(6):16-18,30.
[4]范代读,邱桂强,李从先.东营三角洲的古流向研究[J].石油学报,2000,21(1):29-33.
[5]王友净,宋新民,顾斐,等.高尚堡深层北区沙三段二、三亚段沉积特征与砂体结构[J].油气地质与采收率,2010,17(2):14-16.
[6]吴胜和,熊琦华.油气储层地质学[M].北京:石油工业出版社,1998.
[7]裘怿楠,陈子琪.油藏描述[M].北京:石油工业出版社,1996.
[8]单敬福,纪友亮.大庆油田葡萄花油层组储层非均质性主控因素分析[J].沉积与特提斯地质,2006,26(4):95-99.
[9]杨少春.储层非均质性定量研究的新方法[J].石油大学学报:自然科学版,2000,24(1):53-56.
[10]董贵能,姜在兴,张本琪.济阳坳陷埕东地区新近系馆上段下部三角洲沉积特征[J].油气地质与采收率,2007,14(3):22-25.
[11]于翠玲,林承焰.储层非均质性研究进展[J].油气地质与采收率,2007,14(4):15-18.
[12]唐清山,施晓蓉.高升油田高3块隔夹层特征及对稠油热采的影响[J].特种油气藏,1995,2(1):24-30.
[13]王国鹏,何光玉.双河油田厚油层内夹层分布特征[J].石油勘探与开发,1995,22(2):55-58.
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