萨北油田萨葡油层三角洲砂体非均质性表征
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摘要
开发实践表明,油田进入高含水期后,三角洲前缘相储层内依然存在一定未动用或含油饱和度较高的部位,这些剩余油的存在主要是由于储层的非均质性造成的。喇萨杏油田的河流-三角洲沉积储层中发育着多种三角洲前缘相体,不但规模形态变化复杂,而且成因类型多样,内前缘相发育有枝状三角洲砂体、过渡状三角洲砂体、坨状三角洲砂体、坨状三角洲河口区沉积砂体;外前缘相发育有主体带发育的稳定外前缘相席状砂、过渡状分布的外前缘相席状砂、不稳定分布的外前缘相席状砂。油田开发地质工作者经过多年的探索研究,对这套大型河流—三角洲沉积储层中的各类三角洲砂体,逐步形成了一套成熟的针对不同类型三角洲砂体非均质描述技术方法,并在不同的开发阶段有效地指导了油田的开发方针的指定。本次研究重点针对萨北油田北三区萨尔图葡萄花油层三角洲沉积储层,研究过程中以岩心及密井网测井曲线为主要手段,以层次分析思想为指导,依据三角洲储层沉积理论,在储层精细对比的基础上,开展了单砂体识别、划分、内部夹层的描述和三维地质模型建立等研究,实现了由大到小,逐级描述三角洲砂体储层非均质性的目的,将储层描述发展到更深层次。目的是在原有储层描述的基础上,进一步深化储层认识,为进一步挖掘这类储层的开发潜力提供更深入的地质依据。
The development practices show that there still exists certain unworkable or oil saturation oil in the deltaic front facies reservoir after entering the high water cut stage,which exists because of the heterogeneity of reservoir. Fluvial-deltaic deposits of La-Sa-Xing oilfield develop several deltaic front facies sandbodies,which are not only complex in shape but also many kinds of origins. In inner front facies develops the branched deltaic sandbody,transition deltaic sandbody,mass deltaic sandbody,mass deltaic river mouth depositional sandbody; In outer front facies develop the stable outer front facies sheet sand with developed main body facies belt,transition outer front sheet sand and unstable outer front sheet sand. The geological workers of oil field development have developed a set of description technique of sand body heterogeneity for different types of deltas in studying the large fluvial-deltaic depositional deltaic sandbodies,which has effectively guided the development principle formulation of the oil field in different development stages. The emphasis of the research is to recognize and classify the single sandbody,describe the interbedded layer and establish the 3D geological model aiming at the deltaic reservoir of Putaohua formation in N3 area of Sabei oil field by core and logging curve analysis of dense well pattern based on the deltaic depositional theory and formation correlation. The research realizes the aim of describing heterogeneous reservoir of deltaic sandbody,and bring the reservoir description technique into a high level,providing the geological basis for tapping the potentials of this kind of reservoir.
The development practices show that there still exists certain unworkable or oil saturation oil in the deltaic front facies reservoir after entering the high water cut stage,which exists because of the heterogeneity of reservoir. Fluvial-deltaic deposits of La-Sa-Xing oilfield develop several deltaic front facies sandbodies,which are not only complex in shape but also many kinds of origins. In inner front facies develops the branched deltaic sandbody,transition deltaic sandbody,mass deltaic sandbody,mass deltaic river mouth depositional sandbody; In outer front facies develop the stable outer front facies sheet sand with developed main body facies belt,transition outer front sheet sand and unstable outer front sheet sand. The geological workers of oil field development have developed a set of description technique of sand body heterogeneity for different types of deltas in studying the large fluvial-deltaic depositional deltaic sandbodies,which has effectively guided the development principle formulation of the oil field in different development stages. The emphasis of the research is to recognize and classify the single sandbody,describe the interbedded layer and establish the 3D geological model aiming at the deltaic reservoir of Putaohua formation in N3 area of Sabei oil field by core and logging curve analysis of dense well pattern based on the deltaic depositional theory and formation correlation. The research realizes the aim of describing heterogeneous reservoir of deltaic sandbody,and bring the reservoir description technique into a high level,providing the geological basis for tapping the potentials of this kind of reservoir.
引文
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[11]张昌民.储层研究中的层次分析方法.石油与天然气地质。1992,13(3):344～350
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[13]张一伟,熊琦华,王志章等。陆相油藏描述[M]。北京:石油工业出版社,1997
[14]郑荣才等.高分辨率层序分析在油藏开发工程中的应用[J].沉积学报,2003,21(4):654～662
[15]郑荣才,彭军,吴朝容.陆相盆地基准面旋回的级次划分和研究意义[J].沉积学报,2001,19(2):249～245
[16]张昌民,林克湘,徐龙,等.储层砂体建筑结构分析.江汉石油学院学报,1994, 16( 2):l～7
[17]吕晓光等。高含水后期油田细分单砂层的地质研究[J]。新疆石油地质。1993。14(4):345～349
[18]吕晓光等。应用密井网资料建立单砂层级别储层精细地质模型[J]。97成油体系研讨会论文集。地震出版社,
[2]刘孟慧,赵澄林等编译.第二届国际储层表征技术研讨会译文集.北京:石油大学出版社,1990:1～35。
[3]裘亦楠。中国陆相储层沉积学进展[J]。沉积学报。1992,10(3):16～24
[4]赵瀚卿,付志国,吕晓光,田东辉,王广运。大型河流──三角洲沉积储层精细描述方法[J]。石油学报,2000,21(4):110～113
[5]阎伟林,吕晓光等。An application of petrophysical facies study and artificial neural network in log interpretation at high water cut stage[J]。1996北京水驱开发油田国际测井研讨会宣读论文。
[6]裘亦楠。储层沉积学工作流程[J]。石油勘探与开发。1990,17(1):85～90
[7]赵翰卿,付志国,刘波。应用精细地质研究准确鉴别古代河流砂体[J]。石油勘探与开发。1995,22(2):68～70
[8]刘泽容等.油藏描述原理与方法技术.北京:石油工业出版社,1993 9:68～70。
[9]于翠玲,林乘焰。储层非均质性研究进展[J]。油气地质与采收率。2007,14(4):16～22
[10]裘亦楠,陈子琪。油藏描述[M]。北京:石油工业出版,1996.326～344
[11]张昌民.储层研究中的层次分析方法.石油与天然气地质。1992,13(3):344～350
[12]梅志超,林晋炎。湖泊三角洲的地层模式和骨架砂体的特征[J]。沉积学报,1991,9(4):1～11
[13]张一伟,熊琦华,王志章等。陆相油藏描述[M]。北京:石油工业出版社,1997
[14]郑荣才等.高分辨率层序分析在油藏开发工程中的应用[J].沉积学报,2003,21(4):654～662
[15]郑荣才,彭军,吴朝容.陆相盆地基准面旋回的级次划分和研究意义[J].沉积学报,2001,19(2):249～245
[16]张昌民,林克湘,徐龙,等.储层砂体建筑结构分析.江汉石油学院学报,1994, 16( 2):l～7
[17]吕晓光等。高含水后期油田细分单砂层的地质研究[J]。新疆石油地质。1993。14(4):345～349
[18]吕晓光等。应用密井网资料建立单砂层级别储层精细地质模型[J]。97成油体系研讨会论文集。地震出版社,