渝南关坝地区上三叠统须家河组沉积特征
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摘要
以渝南关坝地区上三叠统须家河组露头为研究对象,进行岩石学、沉积学分析,结果表明,须二段、须四段和须六段以灰白色中–粗粒长石岩屑砂岩为主,分选中等–较好,磨圆为次棱角状–次圆状,孔隙式胶结,大型斜层理及底冲刷面等沉积构造发育;须三段和须五段以灰–灰黄色泥页岩为主,水平层理等沉积构造发育。垂向上,须家河组"二元结构"非常发育,底层沉积厚度远大于顶层;横向上,砂岩被底冲刷面分割为透镜体及楔状体,并连续叠置成巨厚层–厚层砂体。综合研究表明,研究区须家河组须二段、须四段和须六段为辫状河三角洲前缘沉积,须三段和须五段为前辫状河三角洲沉积。
By taking the outcrop of the upper Triassic Xujiahe formation in Guanba area of southern Chongqing as the research object,the petrological and sedimentological analyses were carried out.The results show that the 2~(nd),4~(th) and 6~(th) member of the upper Triassic Xujiahe formation are mainly composed of grey-white medium to medium-coarse feldspathic lithic sandstones,with medium-well sorting,sub sharp-sub circle roundness pore cementation,large-scale inclined beddings and erosional basal surfaces.The 3~(rd) and 5~(th) member of the upper Triassic Xujiahe formation are mainly composed of grey and grey-yellow mud shale with horizontal bedding.In vertical direction,the'dual structure'is very developed in the Xujiahe formation,characterized by the thickness of the bottom layer being much larger than the top layer.In horizontal direction,sandstones are divided by erosional basal surfaces to lens-shaped and wedge-shaped sand body,which form large sand bodies by continuous superimposition.The comprehensive study shows that the 2~(nd),4~(th) and 6~(th) members of Xujiahe formation in the study area are braided delta front sedimentation,and the 3~(rd) and 5~(th) members of Xujiahe formation are braided river delta sedimentation.
By taking the outcrop of the upper Triassic Xujiahe formation in Guanba area of southern Chongqing as the research object,the petrological and sedimentological analyses were carried out.The results show that the 2~(nd),4~(th) and 6~(th) member of the upper Triassic Xujiahe formation are mainly composed of grey-white medium to medium-coarse feldspathic lithic sandstones,with medium-well sorting,sub sharp-sub circle roundness pore cementation,large-scale inclined beddings and erosional basal surfaces.The 3~(rd) and 5~(th) member of the upper Triassic Xujiahe formation are mainly composed of grey and grey-yellow mud shale with horizontal bedding.In vertical direction,the'dual structure'is very developed in the Xujiahe formation,characterized by the thickness of the bottom layer being much larger than the top layer.In horizontal direction,sandstones are divided by erosional basal surfaces to lens-shaped and wedge-shaped sand body,which form large sand bodies by continuous superimposition.The comprehensive study shows that the 2~(nd),4~(th) and 6~(th) members of Xujiahe formation in the study area are braided delta front sedimentation,and the 3~(rd) and 5~(th) members of Xujiahe formation are braided river delta sedimentation.
引文
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[17]何鲤,段勇,罗潇,等.川西坳陷上三叠统层序地层划分新方案[J].天然气工业,2007,27(2):6–11.
[18]何鲤,李梅,熊亮,等.再谈四川盆地上三叠统层序地层划分方案[J].天然气工业,2011,31(6):28–33.
[19]刘兆生,李丽琴,王永栋.重庆合川地区晚三叠世须家河组孢粉组合[J].古生物学报,2015,54(3):279–304.
[20]戴朝成,郑荣才,任军平,等.四川前陆盆地上三叠统须家河组物源区分析及其地质意义[J].吉林大学学报(地球科学版),2014,44(4):1 085–1 096.
[2]曾青高,龚昌明,李俊良,等.川中地区须家河组气藏勘探成果及潜力分析[J].天然气工业,2009,29(6):13–18.
[3]邹才能,陶士振,张响响,等.中国低渗大气区地质特征、控制因素和成藏机制[J].中国科学(D辑),2009,39(11):1 607–1 624.
[4]郑荣才,李国阵,常海亮,等.四川盆地东部上三叠统须家河组层序–岩相古地理特征[J].中国地质,2015,42(4):1 024–1 036.
[5]邢长林,英亚歌.鄂尔多斯盆地陇东地区长8段储层特征与储层四性关系研究[J].石油地质与工程,2012,2(4):42–46.
[6]蒋解梅,王新征,李继山,等.东营凹陷沙四段滩坝砂微相划分与砂体横向预测[J].石油地质与工程,2007,21(4):12–15.
[7]郑荣才,李国辉,戴朝成,等.四川类前陆盆地盆–山耦合系统和沉积学响应[J].地质学报,2012,86(1):170–180.
[8]郑荣才,朱如凯,戴朝成,等.川东北前陆盆地须家河组盆–山耦合过程的沉积–层序特征[J].地质学报,2008,82(8):1 078–1 087.
[9]郑荣才,朱如凯,翟文亮,等.川西类前陆盆地晚三叠世须家河期构造演化及层序充填样式[J].中国地质,2008,35(2):246–255.
[10]戴朝成,郑荣才,朱如凯,等.四川盆地须家河组层序充填样式与油气地质特征[J].地质学报,2010,84(12):1 817–1 828.
[11]高红灿.四川盆地上三叠统须家河组层序–岩相古地理及砂体分布研究[D].四川成都:成都理工大学,2007.
[12]郑荣才,朱如凯,翟文亮,等.川西类前陆盆地晚三叠世须家河期构造演化及层序充填样式[J].中国地质,2008,35(2):246–255.
[13]戴朝成,郑荣才,朱如凯,等.四川盆地须家河组层序充填样式与油气地质特征[J].地质学报,2010,84(12):1 817–1 828.
[14]刘金华,张世奇,孙耀庭,等.川西前陆盆地上三叠统须家河组地层的划分对比及沉积演化[J].地层学杂志,2007,31(2):190–196.
[15]张健,李国辉,谢继容,等.四川盆地上三叠统划分对比研究[J].天然气工业,2006,26(1):12–15.
[16]罗启后.安县运动对四川盆地中西部上三叠统地层划分对比与油气勘探的意义[J].天然气工业,2011,31(6):21–27.
[17]何鲤,段勇,罗潇,等.川西坳陷上三叠统层序地层划分新方案[J].天然气工业,2007,27(2):6–11.
[18]何鲤,李梅,熊亮,等.再谈四川盆地上三叠统层序地层划分方案[J].天然气工业,2011,31(6):28–33.
[19]刘兆生,李丽琴,王永栋.重庆合川地区晚三叠世须家河组孢粉组合[J].古生物学报,2015,54(3):279–304.
[20]戴朝成,郑荣才,任军平,等.四川前陆盆地上三叠统须家河组物源区分析及其地质意义[J].吉林大学学报(地球科学版),2014,44(4):1 085–1 096.