苏北盆地溱潼凹陷戴一段沉积-层序特征及其对岩性勘探的指示意义
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摘要
为厘清溱潼凹陷戴一段岩性勘探有利层段及区带这一关键地质问题,应用高分辨率层序地层学、沉积学等基础理论、技术方法,综合地震、钻井岩心及测井资料,对溱潼凹陷戴一段进行了沉积-层序研究,识别出层序界面及洪泛面两类转换面,并进一步划分为1个长期、5个中期旋回层序,深凹带5个中期旋回层序发育齐全,中-外坡逐渐减少至2个,明确了泰州凸起是戴一段的主物源方向,戴一段发育扇三角洲沉积体系,沉积相带展布受物源、基准面升降共同控制。沉积-层序综合研究表明纵向上戴一段MSC1、MSC2、MSC3时期泥岩隔层发育、储盖组合有利,是岩性勘探最有利层段;平面上相带的展布决定了岩性勘探的有利区带,西斜坡的蔡家堡-陈家舍、帅西、帅垛及帅北地区处于多期扇体前缘砂岩尖灭区,是岩性/构造-岩性圈闭勘探的重点区域。
By using high resolution sequence stratigraphy and sedimentology as tools upon the basis of seismic,coreing and well logging data,we carefully studied the first member of Dainan formation in the Qingtong sag in order to find out the favorable layers for lithology exploration.Two kinds of transitional surface,i.e.the sequence boundary and flooding boundary are recognized.The exploration target layer may be divided into one long-term cycle and five intermediate cycles which may be reduced from five to two from the deep sag to the slop surrounded.The Taizhou uplift was the main source of sediments then and theDainanFormation is a kind of fan deltaic deposits.The distribution of sedimentary facies belts are controlled by both the sediment source and base level changes.In the vertical direction,however,mudstone interlayers were deposited in the stages of MSC1,MSC2,MSC3 as favorable cap rocks.All the data indicates that the 1 st member of the Dainan formation is the most favorable exploration interval.Spatially,facies belt distribution is the key controlling factoron hydrocarbon accumulation.Caijiabao-Chenjiashe,Shuaixi,Shuaiduo and Shuaibei blocks on the west slope where fan front sandbodies frequently pinchout are the most favorable region for lithological and/or structural-lithological traps.
By using high resolution sequence stratigraphy and sedimentology as tools upon the basis of seismic,coreing and well logging data,we carefully studied the first member of Dainan formation in the Qingtong sag in order to find out the favorable layers for lithology exploration.Two kinds of transitional surface,i.e.the sequence boundary and flooding boundary are recognized.The exploration target layer may be divided into one long-term cycle and five intermediate cycles which may be reduced from five to two from the deep sag to the slop surrounded.The Taizhou uplift was the main source of sediments then and theDainanFormation is a kind of fan deltaic deposits.The distribution of sedimentary facies belts are controlled by both the sediment source and base level changes.In the vertical direction,however,mudstone interlayers were deposited in the stages of MSC1,MSC2,MSC3 as favorable cap rocks.All the data indicates that the 1 st member of the Dainan formation is the most favorable exploration interval.Spatially,facies belt distribution is the key controlling factoron hydrocarbon accumulation.Caijiabao-Chenjiashe,Shuaixi,Shuaiduo and Shuaibei blocks on the west slope where fan front sandbodies frequently pinchout are the most favorable region for lithological and/or structural-lithological traps.
引文
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[11]王金铎,许淑梅,季建清,等.车镇凹陷北部陡坡带砂砾岩体识别与储层物性预测[J].海洋地质与第四纪地质,2008,28(2):93-98.[WANG Jinduo,XU Shumei,Ji Jianqing,et al.Recognition sand-gravel body and forecasting its petroleum-bearing feature in northern steep slope of Chezhen sag[J].Marine Geology&Quaternary Geology,2008,28(2):93-98.]
[12]地质矿产部华东石油地质局地质研究大队.苏北盆地新生界油气普查勘探阶段性总结报告[R].南京:中国石化华东分公司,1987:114-115.[Geological Research Group of East China Petroleum Geological Survey,Ministry of Geology and Mineral Resources.The exploration stage summary report of Cenozoic in Subei basin[R].Nanjing:Sinopec East China Branch,1987:114-115.]
[13]郑荣才,文华国,李凤杰.高分辨率层序地层学[M].北京:地质出版社,2010:213-216.[ZHENG Rongcai,WEN Huaguo,LI Fengjie.High-resolution Sequence Stratigraphy[M].Beijing:Geological Publishing House,2010:213-216.]
[14]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):249-255.[ZHENG Rongcai,PENG Jun,WU Chaorong.Grade division of baselevel cycles of terrigenous basin and its implications[J].Acta Sedimentologica Sinica,2001,19(2):249-255.]
[15]高志勇,郑荣才,罗平.陆相高分辨率层序地层中洪泛面特征研究[J].成都理工大学学报:自然科学版,2007,34(1):47-56.[GAO Zhiyong,ZHENG Rongcai,LUO Ping.A study of the flooding surface in the high-resolution stratigraphic sequence of continental deposit[J].Journal of Chengdu University of Technology:Science&Technology Edition,2007,34(1):47-56.]
[16]Cross T A,Lessenger M A.High-resolution stratigraphic correlation from the perspective of base-level cycles and sediment accommodation[C]∥Proceeding of Northwestern European Sequence Stratigraphy Congress.1994:105-123.
[17]刘宝珺.沉积岩石学[M].北京,地质出版社,1980:265-267.[LIU Baojun.Sedimentary Petrology[M].Beijing,Geological Publishing House.1980:265-267.]
[18]臧素华,花彩霞.金湖凹陷金南-腰滩地区戴南组-段高分辨率层序构型及砂体展布特征[J].高校地质学报,2013,19(3):536-543.[ZANG Suhua,HUA Caixia.The sequence architecture and characteristics of sandbody distribution of the first member of the Dainan formation in Jinnan-Yaotan block of Jinhu depreesion[J].Geological Journal of China Universities,2013,19(3):536-543.]
[19]吴伟,臧素华,郭春雷,等.金湖凹陷三河深凹带戴一段近岸水下扇的发现及其地质意义[J].油气藏评价与开发,2015,3(5):7-11.[WU Wei,ZANG Suhua,GUO Chunlei,et al.Discovery and geological significance of coastal subaqueous fan in lower Dainan formation of Sanhe deep hollow zone in Jinhu sag[J].Reservoir Evaluation and Development,2015,5(3):7-11.]
[2]刘伟.苏北溱潼凹陷戴南组一段次生孔隙形成与分布特征[J].岩相古地理,1997,17(2):24-31.[LIU Wei.Formation and distribution of the secondary porosity in the first member of the Dainan formation in the Qintong depression,northern Jiangsu[J].Sedimentary Facies and Palaeogeography,1997,17(2):24-31.]
[3]阎丽妮.苏北溱潼凹陷草舍转换带扇三角洲沉积特征研究[J].科技创新导报,2009,17(2):128-135.[YAN Lini.Research of fan delta sedimentary characteristics in Caoshe transformation zone Qintong depression,northern Jiangsu basin[J].Science and Technology Innovation Herald,2009,17(2):128-135.]
[4]隋风贵.断陷湖盆陡坡带砂砾岩扇体成藏动力学特征[J].石油与天然气地质,2003,24(4):335-340.[SUI Fenggui.Characteristics of reservoiring dynamic on the sand-conglomerate fanbodies in the steep-slope belt of continental fault basin:a case study on Donying depression[J],Oil&Gas Geology,2003,24(4):335-340.]
[5]隋风贵,操应长,刘惠民,等.东营凹陷北带东部古近系近岸水下扇储集物性演化及其油气成藏模式[J].地质学报,2010,82(4):246-256.[SUI Fenggui,CAO Yingchang,LIU Huimin,et al.Physical properties evolution and hydrocarbon accumulation of Paleogene nearshore subaqueous fan in the eastern north margin of the Dongying depression[J].Acta Geologica Sinica,2010,82(4):246-256.]
[6]张喜林,朱筱敏,钟大康,等.苏北盆地高邮凹陷古近系戴南组沉积相及其对隐蔽油气藏的控制[J].古地理学报,2005,7(2):207-218.[ZHANG Xilin,ZHU Xiaomin,ZHONG Dakang,et al.Sedimentary facies and its controlling on subtle oil and gas reservoirs of the Dainan formation of Paleogene in Gaoyou sag,Subei basin[J].Journal of Palaeogeography,2005,7(2):207-218.]
[7]阮伟,Ronald J Steel,黄洁.碎屑岩深水扇研究[J].海洋地质与第四纪地质,2010,30(1):39-46.[RUAN Wei,Ronald J Steel,HUANG Jie.The new advance in clastic deep-water fan[J].Marine Geology&Quaternary Geology,2010,30(1):39-46.]
[8]尹艳树,吴胜和,毛立华等.水下扇储层沉积微相建模——以濮城油田沙三中亚段油藏为例[J].海洋地质与第四纪地质,2005,25(4):125-130.[YIN Yanshu,WU Shenghe,MAO Lihua,et al.Stochastic modeling of microfacies of underwaterfan:An example from the 610layersof Es23in the Pucheng oil field,Dongpu depression[J].Marine Geology&Quaternary Geology,2005,25(4):125-130.]
[9]程立华,陈世悦,吴胜和,等.断陷盆地陡坡带扇三角洲模拟及沉积动力学分析[J].海洋地质与第四纪地质,2005,25(4):29-34.[CHENG Lihua,CHEN Shiyue,WU Shenghe,et al.The simulation and sedimentray dynamic analysis of fan delta in the steep slope of fault basin[J].Marine Geology&Quaternary Geology,2005,25(4):29-34.]
[10]李珊珊,彭松,陶倩倩,等.涠西南凹陷南斜坡晚始新世扇三角洲复杂储层预测关键技术及油气地质意义.[J].海洋地质与第四纪地质,2017,37(2):160-167.[LI Shanshan,PENG Song,TAO Qianqian,et al.Key techniques for prediction of late Eocene fan deltaic reservoir complex on southern slope of Weixinan depression and their petroleuim geological significance[J].Marine Geology&Quaternary Geology,2017,37(2):160-167.]
[11]王金铎,许淑梅,季建清,等.车镇凹陷北部陡坡带砂砾岩体识别与储层物性预测[J].海洋地质与第四纪地质,2008,28(2):93-98.[WANG Jinduo,XU Shumei,Ji Jianqing,et al.Recognition sand-gravel body and forecasting its petroleum-bearing feature in northern steep slope of Chezhen sag[J].Marine Geology&Quaternary Geology,2008,28(2):93-98.]
[12]地质矿产部华东石油地质局地质研究大队.苏北盆地新生界油气普查勘探阶段性总结报告[R].南京:中国石化华东分公司,1987:114-115.[Geological Research Group of East China Petroleum Geological Survey,Ministry of Geology and Mineral Resources.The exploration stage summary report of Cenozoic in Subei basin[R].Nanjing:Sinopec East China Branch,1987:114-115.]
[13]郑荣才,文华国,李凤杰.高分辨率层序地层学[M].北京:地质出版社,2010:213-216.[ZHENG Rongcai,WEN Huaguo,LI Fengjie.High-resolution Sequence Stratigraphy[M].Beijing:Geological Publishing House,2010:213-216.]
[14]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):249-255.[ZHENG Rongcai,PENG Jun,WU Chaorong.Grade division of baselevel cycles of terrigenous basin and its implications[J].Acta Sedimentologica Sinica,2001,19(2):249-255.]
[15]高志勇,郑荣才,罗平.陆相高分辨率层序地层中洪泛面特征研究[J].成都理工大学学报:自然科学版,2007,34(1):47-56.[GAO Zhiyong,ZHENG Rongcai,LUO Ping.A study of the flooding surface in the high-resolution stratigraphic sequence of continental deposit[J].Journal of Chengdu University of Technology:Science&Technology Edition,2007,34(1):47-56.]
[16]Cross T A,Lessenger M A.High-resolution stratigraphic correlation from the perspective of base-level cycles and sediment accommodation[C]∥Proceeding of Northwestern European Sequence Stratigraphy Congress.1994:105-123.
[17]刘宝珺.沉积岩石学[M].北京,地质出版社,1980:265-267.[LIU Baojun.Sedimentary Petrology[M].Beijing,Geological Publishing House.1980:265-267.]
[18]臧素华,花彩霞.金湖凹陷金南-腰滩地区戴南组-段高分辨率层序构型及砂体展布特征[J].高校地质学报,2013,19(3):536-543.[ZANG Suhua,HUA Caixia.The sequence architecture and characteristics of sandbody distribution of the first member of the Dainan formation in Jinnan-Yaotan block of Jinhu depreesion[J].Geological Journal of China Universities,2013,19(3):536-543.]
[19]吴伟,臧素华,郭春雷,等.金湖凹陷三河深凹带戴一段近岸水下扇的发现及其地质意义[J].油气藏评价与开发,2015,3(5):7-11.[WU Wei,ZANG Suhua,GUO Chunlei,et al.Discovery and geological significance of coastal subaqueous fan in lower Dainan formation of Sanhe deep hollow zone in Jinhu sag[J].Reservoir Evaluation and Development,2015,5(3):7-11.]