海拉尔盆地乌尔逊凹陷南屯组沉积相分析
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摘要
综合应用岩心、录井、测井、地震等资料,以地震剖面的追踪和连井剖面对比为基础,通过井-震结合,分析研究区的主要目的层南屯组的层序地层和沉积体系、沉积相带等.通过阐明沉积体系类型和沉积相构成特征,揭示四级层序下沉积相的组合分布,对南屯组的有利沉积相类型进行统计分析.结果表明:南屯组地层是盆地断陷期的沉积充填,随着湖盆持续扩大,形成一套半深湖-深湖为主的地层层序,主要发育扇三角洲、辫状河三角洲、湖底扇、滨浅湖-深湖相沉积;南屯组一段主要岩性为灰色砂岩与深灰色粉砂质泥岩、泥岩互层,从下至上细分为3个四级层序,该沉积时期为区内第一次区域性大规模水进期,沉积厚度较大,区域明显受断裂构造控制,靠近同沉积断裂,可见明显的水进—水退旋回,主要物源方向为北西和北东方向.南屯组二段主要沉积一套灰色、绿灰色粉砂岩和泥质粉砂岩,局部夹有灰色、绿灰色砂砾岩、灰白色细砂岩和厚层灰黑色泥岩.从下至上细分为2个四级层序,主要物源方向为北东方向,次要物源方向为南西方向.
For the characteristics of downfaulted basin,we have to fractionize vertically the stratum to find the lithologic traps or other subtle reservoirs.We fractionized the sequence stratum,deposit system and sedimentary facies of Nantun formation in research area,based on the seismic cross-sections and well tie section planes,applying the rock core samples,logging,oil well logging and seismic material.The result indicated that Nantun formation,which include fan delta,braided river delta,lake bottom fan,shore shallow lake-deep lake facies while the lake expanded continually,were formed in down faulted time.The first section of Nantun formation includes gray sandstone,black gray mudstone and sandy mudstone.There are three inferior level sequences in it.It is the first large-scale water expansion time and formed thick stratum.The characteristics of water expanding and water reducing cycle can be seen in deposit break.Main deposit come from north-east and north-west.The second section of Nantun formation includes gray and green gray sandstone,mudstone,conglomerate and black gray mudstone.There are two inferior level sequences in it.Main deposit come from north-east and secondary deposit come from south-west.The detailed sedimentary facies styles,characteristics and distributed rule were obtained.Then some statistical analysis about advantageous facies were made.All these can be used to analyze the distribution of advantageous lithologic reservoirs.
For the characteristics of downfaulted basin,we have to fractionize vertically the stratum to find the lithologic traps or other subtle reservoirs.We fractionized the sequence stratum,deposit system and sedimentary facies of Nantun formation in research area,based on the seismic cross-sections and well tie section planes,applying the rock core samples,logging,oil well logging and seismic material.The result indicated that Nantun formation,which include fan delta,braided river delta,lake bottom fan,shore shallow lake-deep lake facies while the lake expanded continually,were formed in down faulted time.The first section of Nantun formation includes gray sandstone,black gray mudstone and sandy mudstone.There are three inferior level sequences in it.It is the first large-scale water expansion time and formed thick stratum.The characteristics of water expanding and water reducing cycle can be seen in deposit break.Main deposit come from north-east and north-west.The second section of Nantun formation includes gray and green gray sandstone,mudstone,conglomerate and black gray mudstone.There are two inferior level sequences in it.Main deposit come from north-east and secondary deposit come from south-west.The detailed sedimentary facies styles,characteristics and distributed rule were obtained.Then some statistical analysis about advantageous facies were made.All these can be used to analyze the distribution of advantageous lithologic reservoirs.
引文
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[4]董焕忠.海拉尔盆地乌尔逊凹陷北晚期构造变形与油气聚集[J].大庆石油学院学报,2010,34(6):32-37.
[5]解习农,任建业,焦养泉,等.断陷盆地构造作用与层序样式[J].地质论评,1996,42(3):239-244.
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[11]牟敦山,徐淑艳.乌尔逊凹陷南二段南北油气成藏条件差异性分析[J].大庆石油学院学报,2004,28(3):86-87.
[12]张德宝,陈宪保,韩信.方正断陷三维区新安村组沉积特征[J].大庆石油学院学报,2009,33(4):31-34.
[13]李惠勇,辛仁臣,周心怀,等.渤海海域黄河口凹陷B区东营组三段下部沉积特征[J].大庆石油学院学报,2007,31(2):1-3.
[14]王文广,辛仁臣,柳成志.黑龙江省及呼盟地区晚中生代(J3～K1)沉积盆地类型及演化[J].大庆石油学院学报,1997,21(4):1-5.
[15]田春志,辛仁臣,李慧勇.松辽盆地北部西部断陷沙河子组沉积特征[J].大庆石油学院学报,2002,26(2):1-4.
[2]杨憋新,戴跃进,李清仁,等.乌尔逊凹陷下切谷的特征及成因[J].大庆石油地质与开发,2003,22(5):11-12.
[3]马学辉,张海桥,宋吉杰.海拉尔盆地乌尔逊凹陷油气成藏期次研究[J].大庆石油地质与开发,2004,23(1):7-8.
[4]董焕忠.海拉尔盆地乌尔逊凹陷北晚期构造变形与油气聚集[J].大庆石油学院学报,2010,34(6):32-37.
[5]解习农,任建业,焦养泉,等.断陷盆地构造作用与层序样式[J].地质论评,1996,42(3):239-244.
[6]纪友亮,张世奇.陆相断陷湖盆层序地层学[M].北京:石油工业出版社,1996:22-43.
[7]孟庆新.乌尔逊凹陷乌南地区南屯组层序特征研究[D].大庆:东北石油大学,2010.
[8]Mcpherson J G,Shanmugam G,Motola R J.Fan deltas and braid deltas:Varieties of coarse-grained deltas[J].Geol.Soc.Amer.Bull,1987,99(3):331-340.
[9]徐怀大,魏魁生,洪卫东.层序地层学原理[M].北京:石油工业出版社,1993:49-55.
[10]李思田,林畅松.大型陆相盆地层序地层学研究[J].地学前缘,1995,2(3-4):133-136.
[11]牟敦山,徐淑艳.乌尔逊凹陷南二段南北油气成藏条件差异性分析[J].大庆石油学院学报,2004,28(3):86-87.
[12]张德宝,陈宪保,韩信.方正断陷三维区新安村组沉积特征[J].大庆石油学院学报,2009,33(4):31-34.
[13]李惠勇,辛仁臣,周心怀,等.渤海海域黄河口凹陷B区东营组三段下部沉积特征[J].大庆石油学院学报,2007,31(2):1-3.
[14]王文广,辛仁臣,柳成志.黑龙江省及呼盟地区晚中生代(J3～K1)沉积盆地类型及演化[J].大庆石油学院学报,1997,21(4):1-5.
[15]田春志,辛仁臣,李慧勇.松辽盆地北部西部断陷沙河子组沉积特征[J].大庆石油学院学报,2002,26(2):1-4.
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