三岔—贺旗地区长6-长8期沉积体系研究
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摘要
三岔—贺旗地区位于鄂尔多斯盆地天环坳陷南部,2004年该地区被长庆油田列为甩开勘探的主要地区,期望在三叠系延长组长6—长8油层组的勘探上有所突破。但延长组长6—长8油层组物源的、沉积体系等基础地质问题认识上仍没有达成共识,对西部物源的认识争议最多,特别对沉积砂体的展布及三角洲的范围仍不明确。
本文以现代沉积学原理为基础,通过对研究区钻井岩心观察以及测井相分析,并通过典型岩心的镜下微观特征观察和大量物性资料的统计与分析,重点研究该地区延长组长6—长8油层组的沉积相类型、特征和砂体的展布规律,及该区的物性特征,取得的主要成果和认识概括为以下几方面:
1.以轻、重矿物组合的平面变化为主,结合粒度统计资料、区域沉积背景及野外实测古水流方向来分析研究区在长6、长8油层组沉积期的物源方向,认为研究区目的层主要沉积物来源于盆地的西南缘古陆。
2.根据野外和钻井岩心观察以及测井相分析,认为三岔—贺旗地区三叠系延长组长.6—长8油层组主要发育辫状河三角洲沉积体系及湖泊沉积体系。按岩电特征、沉积构造、古生物特征、剖面结构和测井相特征,进一步划分出三角洲前缘和半深湖—深湖2种亚相以及水下分流河道、分流间湾、席状砂、水下天然堤4种微相,其中三角洲前缘水下分流河道砂体为骨架相,也是研究区最主要的储集层。
3.综合对三岔.贺旗地区物性分析,在长6—长8油层组各小层之间,长8_1,长6_1物性最好,长8_2、长6_3、长6_2物性次之,长7油层组的三个层段长7_1、长7_2和长7_3物性最差。
4.依据沉积相的研究成果,并结合储层的物性参数、砂岩厚度和分布范围、含油饱和度及所收集到少量的试油资料,对长8_2、长8_1、长6_3、长6_2和长6_1层段的有利区块进行了预测。
Sancha - Heqi area is located in the Ordos Basin Tianhuan depression south of the region in 2004 were classified as Changqing Oilfield exploration off the main area, at the Triassic Yanchang Series expect Chang 6 - Chang 8 on oil exploration group has the breakthrough. However, Chang 6 - Chang 8 Group chief source reservoir , the deposition system, basic understanding of geological problems is still no consensus which on the western source of the most controversial, especially on the deposition of sand body distribution and the scope of the delta is still unclear.
In this paper, the principle of modern sediment study, based on drilling through the core of the study area with observation and analysis of log and core through the typical characteristics of the micro-endoscopic observation and substantial information on the physical properties of the statistics and analysis, key research in the area of Yanchang Series Chang 6 - Chang 8 are sedimentary fades types, characteristics and distribution of sandbody laws and characteristics of the area were made aware of the major achievements and summarized as the following:
1. To light and heavy mineral assemblage of the main level changes, combined with particle size statistics, regional deposition measured ancient background and direction of flow field analysis of the study area to Chang 6 at long, long period of Chang 8 layers of sedimentary source direction, consider the purpose of the study area layer of sediment from the main basin of the southwestern margin of Pangea.
2. According to field observation and drilling and logging of core analysis, consider Sancha - Heqi area Yanchang Series Chang 6 - Chang 8 group of major oil development braided river delta and lacustrine depositional system system. By the electric characteristics of rocks, sedimentary structures, palaeontological features, profiles of the characteristics of the structure and logging, and further delineation of the delta front and semi-deep lake - deep lake subfacies, as well as two kinds of underwater distributary channel, separate inter-Bay, I like sand , four kinds of underwater natural levee microfacies, one of the underwater delta front distributary channel sandbody phase for the skeletons, the study area is the most important reservoir.
3. General of Sancha - Heqi area properties analysis, Chang 6 - Chang 8 small layer between the group, the best properties is Chang 8_1 and Chang 6_1, and Chang 8_2, Chang 6_3 Chang 6_2 is worse the physical properties and long oil group 7 duration of the three layers Chang 7_1, Chang 7_2 ,Chang 7_3 is worst properties.
4. Sedimentary facies based on the results of research, combined with the physical properties of reservoir parameters and the distribution of sandstone thickness, oil saturation and collected information on a small number of test oil, the Chang 8_2 Chang 8_1 Chang 6_3 Chang 6_2 and Chang 6_1-storey favorable section of a prediction block.
本文以现代沉积学原理为基础,通过对研究区钻井岩心观察以及测井相分析,并通过典型岩心的镜下微观特征观察和大量物性资料的统计与分析,重点研究该地区延长组长6—长8油层组的沉积相类型、特征和砂体的展布规律,及该区的物性特征,取得的主要成果和认识概括为以下几方面:
1.以轻、重矿物组合的平面变化为主,结合粒度统计资料、区域沉积背景及野外实测古水流方向来分析研究区在长6、长8油层组沉积期的物源方向,认为研究区目的层主要沉积物来源于盆地的西南缘古陆。
2.根据野外和钻井岩心观察以及测井相分析,认为三岔—贺旗地区三叠系延长组长.6—长8油层组主要发育辫状河三角洲沉积体系及湖泊沉积体系。按岩电特征、沉积构造、古生物特征、剖面结构和测井相特征,进一步划分出三角洲前缘和半深湖—深湖2种亚相以及水下分流河道、分流间湾、席状砂、水下天然堤4种微相,其中三角洲前缘水下分流河道砂体为骨架相,也是研究区最主要的储集层。
3.综合对三岔.贺旗地区物性分析,在长6—长8油层组各小层之间,长8_1,长6_1物性最好,长8_2、长6_3、长6_2物性次之,长7油层组的三个层段长7_1、长7_2和长7_3物性最差。
4.依据沉积相的研究成果,并结合储层的物性参数、砂岩厚度和分布范围、含油饱和度及所收集到少量的试油资料,对长8_2、长8_1、长6_3、长6_2和长6_1层段的有利区块进行了预测。
Sancha - Heqi area is located in the Ordos Basin Tianhuan depression south of the region in 2004 were classified as Changqing Oilfield exploration off the main area, at the Triassic Yanchang Series expect Chang 6 - Chang 8 on oil exploration group has the breakthrough. However, Chang 6 - Chang 8 Group chief source reservoir , the deposition system, basic understanding of geological problems is still no consensus which on the western source of the most controversial, especially on the deposition of sand body distribution and the scope of the delta is still unclear.
In this paper, the principle of modern sediment study, based on drilling through the core of the study area with observation and analysis of log and core through the typical characteristics of the micro-endoscopic observation and substantial information on the physical properties of the statistics and analysis, key research in the area of Yanchang Series Chang 6 - Chang 8 are sedimentary fades types, characteristics and distribution of sandbody laws and characteristics of the area were made aware of the major achievements and summarized as the following:
1. To light and heavy mineral assemblage of the main level changes, combined with particle size statistics, regional deposition measured ancient background and direction of flow field analysis of the study area to Chang 6 at long, long period of Chang 8 layers of sedimentary source direction, consider the purpose of the study area layer of sediment from the main basin of the southwestern margin of Pangea.
2. According to field observation and drilling and logging of core analysis, consider Sancha - Heqi area Yanchang Series Chang 6 - Chang 8 group of major oil development braided river delta and lacustrine depositional system system. By the electric characteristics of rocks, sedimentary structures, palaeontological features, profiles of the characteristics of the structure and logging, and further delineation of the delta front and semi-deep lake - deep lake subfacies, as well as two kinds of underwater distributary channel, separate inter-Bay, I like sand , four kinds of underwater natural levee microfacies, one of the underwater delta front distributary channel sandbody phase for the skeletons, the study area is the most important reservoir.
3. General of Sancha - Heqi area properties analysis, Chang 6 - Chang 8 small layer between the group, the best properties is Chang 8_1 and Chang 6_1, and Chang 8_2, Chang 6_3 Chang 6_2 is worse the physical properties and long oil group 7 duration of the three layers Chang 7_1, Chang 7_2 ,Chang 7_3 is worst properties.
4. Sedimentary facies based on the results of research, combined with the physical properties of reservoir parameters and the distribution of sandstone thickness, oil saturation and collected information on a small number of test oil, the Chang 8_2 Chang 8_1 Chang 6_3 Chang 6_2 and Chang 6_1-storey favorable section of a prediction block.
引文
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[19]张抗.鄂尔多斯断块构造与资源.西安:陕西科技出版社,1989
[20]K.E.彼得斯、J.M.莫尔多万.生物标记化合物指南.姜乃煌等译.北京:石油工业出版社 1995:
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[22]肖慈旬等译.测井地质在油气勘探中的应用.北京:石油工业出版社,1991
[23]Schmid,S.;Worden,R.H.;Fisher,Q.J.Diagenesis and reservoir quality of the Sherwood Sandstone (Triassic),Corrib Field,Slyne Basin,west of Ireland[J].Marine and Petroleum Geology Volume:21,Issue:3,March,2004,pp.299-315
[24]El Albani,Abderrazzak,Cloutier,et al.Early diagenesis of the Upper Devonian Escuminac Formation in the Gaspe Peninsula,Quebec:sedimentological and geochemical evidence[J]Sedimentary Geology Volume:146,Issue:3-4,January 15,2002,pp.209-223
[25]陈钢花.陕甘宁盆地三叠系延长组测井—沉积微相研究.中国海上油气(地质),2002
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[29]史基安,王金鹏,毛明陆等.鄂尔多斯盆地西峰油田三叠系延长组长6—8段储层砂岩成岩作用研究[J].沉积学报,2003,30(4):40-42
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[31]温爱琴,范久霄.鄂尔多斯盆地镇泾地区三叠系烃源岩地化特征及勘探前景.河南石油,2003(17):16-17
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[33]柳益群.陕甘宁盆地东部上三叠统含油长石砂岩的成岩特点及孔隙演化[J].沉积学报,1996,14(3):87-96
[34]付金华,邓秀芹等著.天环坳陷石油勘探目标评价.长庆油田分公司勘探开发研究院,2003
[35].王多云,史基安等著.陇东地区长6—长8优质储层形成机理及有利区预测.长庆油田勘探开发研究院,2002:1-80
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[2]赵澄林.沉积学原理[M].北京:石油工业出版社,2001:1-5
[3]李德生.重新认识鄂尔多斯盆地油气地质学[J].石油勘探与开发.2004:12(31):2-5
[4]杨俊杰.鄂尔多斯盆地构造演化与油气分布规律[M].北京石油工业出版社,2002:1-45
[5]杨雷,梅志超,熊伟.陕北地区延长组层序地层划分与含油气性[J].古地理学报,2001,3(3):83-88
[6]彭艳琴,李文厚等.陇东地区上三叠统延长组早中期物源分析与沉积体系[J],煤田地质与勘探,2006,02,34(1):3-4
[7]赵宏格,刘池洋.物源分析方法及研究进展[J].沉积学报,2003,9,21(3):1-2
[8]罗静兰,李忠心,史成恩.鄂尔多斯盆地西南部上三叠统延长组长8_长6油层组的沉积体系与物源方向[J].地址通报,2008,1,27(1):1-2
[9]罗静兰等 鄂尔多斯盆地周缘及西峰地区延长组长8_长6沉积物源[J].中国科学,D辑,第37卷:1-3
[10]罗静兰等.西峰油田长8沉积相研究.西北大学地质系内部资料.2005 1-20
[11]郭正权.鄂尔多斯盆地侏罗系古地貌油田形成条件与分布规律.中国石油勘探.2001,4:3-20
[12]李克勤.中国石油地质志十二卷,1988:1-30
[13]Petter,P,E,Pettijion F,J.著,陈发景等译,古流与盆地分析[M]北京:石油工业出版社.1991:1-30
[14]宋凯、吕剑文、杜金良等.鄂尔多斯盆地中部上三叠统延长组物源方向分析与三角洲沉积体系[J].古地理学报.2002:4(3):59-66
[15]梅志超.沉积相与古地理重建[M].西安:西北大学出版社,1994:235-239
[16]蔺宏斌,姚泾利.鄂尔多斯盆地南部延长组沉积特征与物源探讨[J].西安石油学院报.2000 15(5):7-9
[17]赵重远等.鄂尔多斯盆地西南缘地质构造演化,西北大学盆地研究所,1990
[18]张抗.论贺兰裂堑.鄂尔多斯盆地西缘地区石油地质论文集.1985.
[19]张抗.鄂尔多斯断块构造与资源.西安:陕西科技出版社,1989
[20]K.E.彼得斯、J.M.莫尔多万.生物标记化合物指南.姜乃煌等译.北京:石油工业出版社 1995:
[21]马正.应用自然电位测井曲线解释沉积环境.石油与天然气地质.1982,3(1):25-9
[22]肖慈旬等译.测井地质在油气勘探中的应用.北京:石油工业出版社,1991
[23]Schmid,S.;Worden,R.H.;Fisher,Q.J.Diagenesis and reservoir quality of the Sherwood Sandstone (Triassic),Corrib Field,Slyne Basin,west of Ireland[J].Marine and Petroleum Geology Volume:21,Issue:3,March,2004,pp.299-315
[24]El Albani,Abderrazzak,Cloutier,et al.Early diagenesis of the Upper Devonian Escuminac Formation in the Gaspe Peninsula,Quebec:sedimentological and geochemical evidence[J]Sedimentary Geology Volume:146,Issue:3-4,January 15,2002,pp.209-223
[25]陈钢花.陕甘宁盆地三叠系延长组测井—沉积微相研究.中国海上油气(地质),2002
[26]李兴国著.陆相储层沉积微相与微型构造.北京:石油工业出版社,2000
[27]陈安宁,韩永林.鄂尔多斯盆地晚三叠世大型三角洲沉积[J].低渗透油气田,2002,7(2):1-4.鄂尔多斯盆地陇东地区三叠系延长组长6_长8储层评价及有利区带预测
[28]蒋凌志,顾家裕等.中国含油气盆地碎屑岩低渗透储层的特征及形成机理[J].沉积学报2004,3(22):13-17
[29]史基安,王金鹏,毛明陆等.鄂尔多斯盆地西峰油田三叠系延长组长6—8段储层砂岩成岩作用研究[J].沉积学报,2003,30(4):40-42
[30]朱筱敏,刘成林.苏里格地区上古生界有效储层的确定[J].天然气工业,2006,26(9):1-3
[31]温爱琴,范久霄.鄂尔多斯盆地镇泾地区三叠系烃源岩地化特征及勘探前景.河南石油,2003(17):16-17
[32]邓隆武.储层沉积学.石油工业出版社,1998
[33]周荣安.长庆油田产能建设生产测井解释及方法研究.1999
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