近岸水下扇砂砾岩沉积特征及扇体分布规律
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摘要
近岸水下扇是在陆相湖盆陡坡带发育的一种重要油气储层类型,沉积特征复杂,扇体多期叠置。在系统观察岩心和精细地层对比的基础上,结合地震、测井等资料,详细分析了东营凹陷北部陡坡带胜坨地区坨123断块沙四段近岸水下扇砂砾岩体的沉积特征和扇体分布规律。研究表明,近岸水下扇岩性以砂砾岩、含砾砂岩为主,粒度特征、电性特征、沉积构造、地震反射特征综合反映了以重力流为主的沉积环境,可细分为扇中主体、扇中侧缘、扇中前缘、扇端、湖相泥、滑塌浊积砂等6种沉积微相类型。单期扇体顺物源方向均呈一定角度插入湖相地层,扇中主体部位不同期次扇体间沉积界面缺失,扇体直接叠置形成巨厚砂砾岩体,扇中前缘及扇端部位不同期次扇体间的泥岩隔层相对完整。扇体规模自下而上逐渐减小,向北部物源方向退积。
The nearshore subaqueous fan is a type of important hydrocarbon reservoir,which developed in the steep slope zone of continental faulted basin.The fan bodies were formed by multiphase fans,and the depositional characteristics are very complicated.Based on core observation and stratigraphic correlation and combined with seismic data and well logging data,the depositional characteristics of glutenite and fan distribution laws in nearshore subaqueous fan are analyzed for the fourth member of Shahejie Formation of Tuo 123 block in Shengtuo Area of northern steep slope zone of Dongying Depression.The study shows that the lithology of nearshore subaqueous fan is mainly the glutenite and pebbled sandstone.The grain size characteristics,logging responses,sedimentary structure and seismic reflections indicated the depositional environment with density current feature.The single-stage fan can be divided into six kinds of depositional microfacies,including main body of middle fan,front of middle fan,lateral margin of middle fan,outer fan,lacustrine mud and turbidite sand body.The single-stage fan body went into the lacustrine sedimentation with same angle along the provenance orientation.The fan bodies in the region of main part of middle fan override directly to form the thick glutenite bodies because of the absent of the depositional interface in the different stage fan bodies.The mudstone intercalations among the different-stage fans are intact in the region of the front of middle fan and outer fan.The distribution scale of the fan bodies tapered off in ascending order and retrograded to northern provenance step by step.
The nearshore subaqueous fan is a type of important hydrocarbon reservoir,which developed in the steep slope zone of continental faulted basin.The fan bodies were formed by multiphase fans,and the depositional characteristics are very complicated.Based on core observation and stratigraphic correlation and combined with seismic data and well logging data,the depositional characteristics of glutenite and fan distribution laws in nearshore subaqueous fan are analyzed for the fourth member of Shahejie Formation of Tuo 123 block in Shengtuo Area of northern steep slope zone of Dongying Depression.The study shows that the lithology of nearshore subaqueous fan is mainly the glutenite and pebbled sandstone.The grain size characteristics,logging responses,sedimentary structure and seismic reflections indicated the depositional environment with density current feature.The single-stage fan can be divided into six kinds of depositional microfacies,including main body of middle fan,front of middle fan,lateral margin of middle fan,outer fan,lacustrine mud and turbidite sand body.The single-stage fan body went into the lacustrine sedimentation with same angle along the provenance orientation.The fan bodies in the region of main part of middle fan override directly to form the thick glutenite bodies because of the absent of the depositional interface in the different stage fan bodies.The mudstone intercalations among the different-stage fans are intact in the region of the front of middle fan and outer fan.The distribution scale of the fan bodies tapered off in ascending order and retrograded to northern provenance step by step.
引文
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[2]孔凡仙.东营凹陷北带砂砾岩扇体勘探技术与实践[J].石油学报,2000,21(5):27-31.Kong Fanxian.Exploration technique and practice of sandy-conglomeratic fans in the northern part of Dongying Depression[J].Acta Petrolei Sinica,2000,21(5):27-31.
[3]张萌,田景春.“近岸水下扇”的命名、特征及其储集性[J].岩相古地理,1999,19(4):42-52.Zhang Meng,Tian Jingchun.The nomenclature,sedimentarycharacteristics and reservoir potential of nearshore subaqueous fans[J].Sedimentary Facies and Palaeogeography,1999,19(4):42-52.
[4]鄢继华,陈世悦.东营凹陷北部陡坡带近岸水下扇沉积特征[J].石油大学学报:自然科学版,2005,29(1):12-16.Yan Jihua,Chen Shiyue.Sedimentary characteristics of nearshoresubaqueous fans in steep slope of Dongying Depression[J].Journal ofthe University of Petroleum,China:Edition of Natural Science,2005,29(1):12-16.
[5]赵俊青,纪友亮,夏斌,等.近岸水下扇沉积体系高精度层序地层学研究[J].沉积学报,2005,23(3):490-497.Zhao Junqing,Ji Youliang,Xia Bin,et al.High-resolution sequenceresearch on nearshore subaqueous fan system[J].ActaSedimentologica Sinica,2005,23(3):490-497.
[6]鲜本忠,王永诗.基于小波变换基准面恢复的砂砾岩期次划分与对比[J].中国石油大学学报:自然科学版,2008,32(6):1-5.Xian Benzhong,Wang Yongshi.Division and correlation of glutenitesedimentary cycles based on base-level restoration using wavelettransform[J].Journal of China University of Petroleum:Edition ofNatural Science,2008,32(6):1-5.
[7]刘家铎,田景春,何建军,等.近岸水下扇沉积微相及储层的控制因素研究:以沾化凹陷罗家鼻状构造沙四段为例[J].成都理工学院学报,1999,26(4):365-369.Liu Jiaduo,Tian Jingchun,He Jianjun,et al.A study of sedimentarymicrofacies and controlling factors of the reservoirs of the nearshoresubaqueous fan:taking the fourth member of the Shahejie Formation inthe Luojia Nose,Zhanhua Depression for an example[J].Journal ofChengdu University of Technology,1999,26(4):365-369.
[8]袁向春,钟建华,高喜龙,等.埕岛东斜坡水下扇沉积特征[J].石油与天然气地质,2003,24(2):146-151.Yuan Xiangchun,Zhong Jianhua,Gao Xilong,et al.Study ofsedimentary characteristics of subaqueous fan in eastern slope ofChengdao[J].Oil&Gas Geology,2003,24(2):146-151.
[9]初丽兰,纪友亮,张瑞峰,等.饶阳凹陷马西地区近岸水下扇沉积特征及含油性[J].石油地质与工程,2009,23(3):16-19,22.ChuLilan,JiYouliang,ZhangRuifeng,etal.Sedimentary characteristicsand oil-bearing feature of nearshore subaqueous fan at Maxi Area,Raoyang Depression[J].Petroleum Geology and Engineering,2009,23(3):16-19,22.
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