沾河断陷下白垩统淘淇河组层序地层格架及有利生储盖组合
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摘要
通过对岩心、钻井及地震资料的研究,并结合粒度分析及地震相等分析手段,在沾河断陷下白垩统淘淇河组共确定出3种层序界面类型,识别出5个层序界面及4个三级层序。认为淘淇河组属于断陷盆地深陷扩张期—断坳转换期发育的一套沉积地层,从层序SQ1—SQ4断陷陡坡带、凹陷带及缓坡带分别发育冲积扇—扇三角洲、半深湖—深湖—湖底扇、扇三角洲—辫状河三角洲沉积体系,为盆地深陷期沉积产物;在层序SQ3—SQ4断陷陡坡带、凹陷带及缓坡带分别发育扇三角洲、湖泊、辫状河三角洲沉积,为断陷盆地断坳转换期的沉积产物。同沉积断裂的构造活动是控制层序发育及沉积演化的主要因素。综合分析表明,SQ1层序内部烃源岩发育、并具有较好的储集、运移及封盖条件,为研究区最有利的生储盖组合。
According to drilling core,bore well,seismic data,particle size analysis and seismic facies analysis,we confirmed three sequence types of the Low Cretaceous Taoqihe Formation in the Zhanhe rift,and identified five sequence boundaries and four three-order sequences.The Taoqihe Formation is a set of sedimentary formation which belonged to the period of basin large expanding and fault sag conversion in the rift basin.The sedimentary system of alluvial fan,half deep lake-deep lake-sublacutrine fan,and fan delta-braid river delta is developed in the acitc region,hollow zone,and slop region,respectively,from SQ1 to SQ2,which was a sedimentary product during the period of the basin large expanding.The sedimentary system of fan delta,lacustrine,and braid river delta is developed in the acitc region,hollow zone,and slop region,respectively,from SQ3 to SQ4,which was a sedimentary product during the period of the fault sag conversion.The tectonic activity of syndeposit fault is the main factor in controlling the development of sequence and sedimentary evolution.By comprehensive analysis,there is not only development of source rock,but also development of preferable reservoir rock,migration and seal condition in the SQ1,which is the favorable area of source-reservoir-caprock assemblages.
According to drilling core,bore well,seismic data,particle size analysis and seismic facies analysis,we confirmed three sequence types of the Low Cretaceous Taoqihe Formation in the Zhanhe rift,and identified five sequence boundaries and four three-order sequences.The Taoqihe Formation is a set of sedimentary formation which belonged to the period of basin large expanding and fault sag conversion in the rift basin.The sedimentary system of alluvial fan,half deep lake-deep lake-sublacutrine fan,and fan delta-braid river delta is developed in the acitc region,hollow zone,and slop region,respectively,from SQ1 to SQ2,which was a sedimentary product during the period of the basin large expanding.The sedimentary system of fan delta,lacustrine,and braid river delta is developed in the acitc region,hollow zone,and slop region,respectively,from SQ3 to SQ4,which was a sedimentary product during the period of the fault sag conversion.The tectonic activity of syndeposit fault is the main factor in controlling the development of sequence and sedimentary evolution.By comprehensive analysis,there is not only development of source rock,but also development of preferable reservoir rock,migration and seal condition in the SQ1,which is the favorable area of source-reservoir-caprock assemblages.
引文
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[2]Yang Jianguo,Shao Zhaoyi,Wu Heyong,et al.Sedimentaryfacies types and evolution of the Sunwu-Jiayin basin in north-ern Heilongjiang province[J].Chinese Journal of Geology,2008,43(4):640-648.[杨建国,邵2一,吴河勇,等.黑龙江北部孙吴—嘉荫盆地沉积相类型及其演化[J].地质科学,2008,43(4):640-648.]
[3]Xie Xiaojun,Deng Hongwen.Several issues concerning struc-ture sequence strata research in continental faulted basin[J].Natural Gas Geoscience,2007,18(6):838-842.[谢晓军,邓宏文.陆相断陷盆地构造—层序地层研究需注意的几个问题[J].天然气地球科学,2007,18(6):838-842.]
[4]Zhu Xiaomin,Kang An,Wang Guiwen.Sequence stratigraphicmodels of depression and faulted-down lake basins[J].ActaSedimentologica Sinica,2003,21(2):283-287.[朱筱敏,康安,王贵文.陆相坳陷型和断陷型湖盆层序地层样式探讨[J].沉积学报,2003,21(2):283-287.]
[5]Liu Zhaojun.Lacus subaqueous fan sedimenary characteristicsand influence factors—A case study of Shuangyang Formationin Moliqing fault subsidence of Yitong basin[J].Acta Sedim-entologica Sinica,2003,21(1):148-153.[刘招君.湖泊水下扇沉积特征及影响因素———以伊通盆地莫里青断陷双阳组为例[J].沉积学报,2003,21(1):148-153.]
[6]Liu Chensheng,Guo Jianhua,Zhu Rui.Probe into sublacustrinefan of Triassic in Akekule area,Tarim basin[J].Journal ofSouthwest Petroleum University:Natural Science Edition,2008,30(3):17-20.[刘辰生,郭建华,朱锐.塔里木盆地阿克库勒地区三叠系湖底扇初探[J].西南石油大学学报:自然科学版,2008,30(3):17-20.]
[7]Walker R G.Deep water sandstone facies and ancient subma-rine fans:Models for exploration for stratigraphic-traps[J].AAPG Bulletin,1978,62(6):932-966.
[8]Guo Yanru.Sequence types and sequence stratigraphic modelsof Chagan fault-depressed stagnant lacustrine depression,Yin-E basin[J].Natural Gas Geoscience,2003,14(6):448-452.[郭彦如.银额盆地查干断陷闭流湖盆层序类型与层序地层模式[J].天然气地球科学,2003,14(6):448-452.]
[9]Zhang Shiqi,Ji Youliang,Wang Jinyou,et al.An approach tothe accommodation space changes of the fault-depression lakebasin[J].Jounnal of Minaral Petrol,2001,21(2):34-37.[张世奇,纪友亮,王金友,等.陆相断陷湖盆中可容空间变化特征探讨[J].矿物岩石,2001,21(2):34-37.]
[10]Wang Jufeng.Sedimentary facies types and evolution featureson steep slope belt in terrestrial fault depressed basin:A casein Sha 3 and 4 member of Minfeng area in Dongying depres-sion[J].Natural Gas Geoscience,2008,1919(5):611-617.[王居峰.陆相断陷盆地陡坡带沉积相类型与沉积演化特征———以东营凹陷民丰地区沙三段、沙四段为例[J].天然气地球科学,2008,19(5):611-617.]
[11]Feng Youliang.Distribution of stratigraphic and lithologic reser-voirs in sequence framework of rift-subsidence basin[J].ActaPetrolei Sinica,2005,26(4):17-22.[冯有良.断陷盆地层序格架中岩性地层油气藏分布特征[J].石油学报,2005,26(4):17-22.]
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