海拉尔盆地乌尔逊凹陷北部高分辨率层序地层与储层预测
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摘要
海拉尔盆地乌尔逊凹陷北部断裂复杂,沉积成因类型多,油藏类型认识不清。应用高分辨率层序地层学原理和分析方法,以岩心、测井、地震资料为基础,通过研究区主要含油层段(南屯组二段、大磨拐河组一段)层序地层关键界面的识别与对比,逐级控制,建立了盆地高分辨率层序格架。研究表明,乌尔逊凹陷北部苏131、苏102断块油藏产油层段跨越两个三级层序界面,主要产油层段位于大磨拐河组一段三级层序底部,主要储层为低位域滑塌浊积岩储集体,而不是此前认为的南屯组二段三级层序顶部的扇三角洲前缘砂体。通过对研究区主要产油层段的层序地层位置重新厘定与对储集体成因类型详细分析,提出了乌尔逊凹陷北部地区油藏类型应该为构造-岩性油气藏的新认识,并分析了砂层组的时空展布特征,为该油田深入开发与扩边提供了依据。
The reservoir types are unclear in the northern Wuerxun Sag,the Hailar Basin,due to the complex fractures and various sedimentary genetic types.Based on the core,seismic and logging data,a high resolution sequence framework was established through the identification and comparison of key boundaries of the main oil-bearing formations,i.e.the second member of Nantun Formation(K1n2) and the first member of Damoguaihe Formation(K1d1).The pay zones cross two third-order sequence boundaries in the Su 131 and Su 102 fault-block reservoirs.The main reservoir is the low-system-tract slumped turbidite located at the bottom of the third-order sequence instead of the fan-delta front sand body located at the top of third-order sequence.Based on redefinition of the sequence-stratigraphic position of the main pay zone and analysis of reservoir genetic types,it is proposed that the reservoir in the northern Wuerxun Sag is of structural-lithologic type.In addition,the temporal and spatial distribution of sand units is analyzed.These understandings lay a solid basis for further development and extension of the oilfield.
The reservoir types are unclear in the northern Wuerxun Sag,the Hailar Basin,due to the complex fractures and various sedimentary genetic types.Based on the core,seismic and logging data,a high resolution sequence framework was established through the identification and comparison of key boundaries of the main oil-bearing formations,i.e.the second member of Nantun Formation(K1n2) and the first member of Damoguaihe Formation(K1d1).The pay zones cross two third-order sequence boundaries in the Su 131 and Su 102 fault-block reservoirs.The main reservoir is the low-system-tract slumped turbidite located at the bottom of the third-order sequence instead of the fan-delta front sand body located at the top of third-order sequence.Based on redefinition of the sequence-stratigraphic position of the main pay zone and analysis of reservoir genetic types,it is proposed that the reservoir in the northern Wuerxun Sag is of structural-lithologic type.In addition,the temporal and spatial distribution of sand units is analyzed.These understandings lay a solid basis for further development and extension of the oilfield.
引文
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[12]吴河勇,李子顺,冯子辉,等.海拉尔盆地乌尔逊-贝尔凹陷构造特征与油气成藏过程分析[J].石油学报,2006,27:1-6.Wu Heyong,Li Zishun,Feng Zihui,et al.Analysis on structuralfeatures and reservoir-forming process of Wuerxun and Beiersags in Hailaer basin[J].ACTA Petrolei Sinica,2006,27:1-6.
[13]刘志文.乌尔逊凹陷油气运移方向研究[J].断块油气田,2008,15(5):31-33.Liu Zhiwen.Migration direction of oil and gas in Wuerxun depres-sion[J].Fault Block Oil&Gas Field,2008,15(5):31-33.
[14]秦雁群,邓宏文,丁寒生.乌尔逊-贝尔凹陷构造调节带特征、成因机制及其地质意义[J].现代地质,2009,23(5):872-879.Qin Yanqun,Deng Hongwen,Ding Hansheng.Characteristic,geologic meaning and forming mechanisms of the structural ac-commodation zones in Wuerxun-Beier depression[J].Geosci-ence,2009,23(5):872-879.
[15]Cross T A.Stratigraphic controls on reservoir attributes in conti-nental strata[J].Earth Science Frontiers,2000,7(4):322-350.
[16]邓宏文.高分辨率层序地层学应用中的问题探析[J].古地理学报,2009,11(5):471-480.Deng Hongwen.Discussion on problems of applying high reso-lution sequence stratigraphy[J].Journal of Palaeogeography,2009,11(5):471-480.
[2]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 base-level cycles of terrigenous basin and its implications[J].ACTASedimentologica Sinica,2001,19(2):249-255.
[3]邓宏文.美国层序地层研究中的新学派——高分辨率层序地层学[J].石油与天然气地质,1995,16(2):89-97.Deng Hongwen.A new school of thought in sequence strati-graphic studies in U.S.A.:high-resolution sequence stratigra-phy[J].Oil&Gas Geology,1995,16(2):89-97.
[4]Lin Changsong,Zheng Herong,Ren Jianye,et al.The control ofsyn-depositional faulting on the Eogene sedimentary basin fillsof the Dongying and Zhanhua sags,Bohai Bay Basin[J].Sci-ence in China:Series D,2004,47(9):769-782.
[5]林畅松.沉积盆地的层序和沉积充填结构及过程响应[J].沉积学报,2009,27(5):849-862Lin changsong.Sequence and depositional architecture of sedi-mentary basin and process responses[J].ACTA Sedimentologi-ca Sinica,2009,27(5):849-862.
[6]王起琮.旋回层序地层的控制因素[J].石油与天然气地质,2009,30(5):648-656.Wang Qicong.Controlling factors of cyclic sequence stratigraphy[J].Oil&Gas Geology,2009,30(5):648-656.
[7]张成,李春柏,楚美娟,等.乌尔逊凹陷下白垩统高频层序特征及其控制因素分析[J].沉积学报,2005,23(4):657-663.Zhang Cheng,Li Chunbai,Chu Meijuan,et al.Analysis oncharacteristics and controls of high-frequency sequences of low-er cretaceous series in Wuerxun depression[J].ACTA Sedim-entologica Sinica,2005,23(4):657-663.
[8]刘志宏,任延广,李春柏,等.海拉尔盆地乌尔逊-贝尔凹陷的构造特征及其对油气成藏的影响[J].大地构造与成矿学,2007,31(2):151-156.Liu Zhihong,Ren Yanguang,Li Chunbai,et al.Structural fea-tures and their impacts on hydrocarbon accumulation in Urxun-Beier depression in Hailaer basin[J].Geotectonica Et Metallo-genia,2007,31(2):151-156.
[9]魏建设,庞雄奇,卢进才,等.乌尔逊-贝尔凹陷油气分布规律及其主控因素[J].天然气工业,2008,28(9):24-27.Wei Janshe,Pang Xiongqi,Lu Jincai,et al.Distribution patternsof oil and gas and their major controlling factors in Wuerxunand Beier sags[J].Natural Gas Industry,2008,28(9):24-27.
[10]冯志强,任延广,张晓东,等.海拉尔盆地油气分布规律及下步勘探方向[J].中国石油勘探,2004,9(4):19-24.Feng Zhiqiang,Ren Yanguang,Zhang Xiaodong,et al.Law ofoil and gas distribution in Hailaer basin and orientation for ex-ploration at next stage[J].China Petrleum Exploration,2004,9(4):19-24.
[11]李文学,李建民,谢朝阳.海拉尔复杂断陷盆地油气勘探与开发[M].北京:石油工业出版社,2006:1-112.Li Wenxue,Li Jianming,Xie Zhaoyang.Oil and gas explorationand development of Hailaer complex fault basin[M].Beijing:Petroleum Industry Press,2006:1-112.
[12]吴河勇,李子顺,冯子辉,等.海拉尔盆地乌尔逊-贝尔凹陷构造特征与油气成藏过程分析[J].石油学报,2006,27:1-6.Wu Heyong,Li Zishun,Feng Zihui,et al.Analysis on structuralfeatures and reservoir-forming process of Wuerxun and Beiersags in Hailaer basin[J].ACTA Petrolei Sinica,2006,27:1-6.
[13]刘志文.乌尔逊凹陷油气运移方向研究[J].断块油气田,2008,15(5):31-33.Liu Zhiwen.Migration direction of oil and gas in Wuerxun depres-sion[J].Fault Block Oil&Gas Field,2008,15(5):31-33.
[14]秦雁群,邓宏文,丁寒生.乌尔逊-贝尔凹陷构造调节带特征、成因机制及其地质意义[J].现代地质,2009,23(5):872-879.Qin Yanqun,Deng Hongwen,Ding Hansheng.Characteristic,geologic meaning and forming mechanisms of the structural ac-commodation zones in Wuerxun-Beier depression[J].Geosci-ence,2009,23(5):872-879.
[15]Cross T A.Stratigraphic controls on reservoir attributes in conti-nental strata[J].Earth Science Frontiers,2000,7(4):322-350.
[16]邓宏文.高分辨率层序地层学应用中的问题探析[J].古地理学报,2009,11(5):471-480.Deng Hongwen.Discussion on problems of applying high reso-lution sequence stratigraphy[J].Journal of Palaeogeography,2009,11(5):471-480.
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