古代富泥低弯度河的识别与特征
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摘要
目的区分古代富泥低弯度河流与曲流河,总结其沉积特征和河道砂岩的展布,为储层描述和预测提供参考。方法从不同盆地和时代的三维地震资料中识别出非辫状河也非曲流河的古代低弯度河道的展布与延伸,比较其河道(带)与漫滩的沉积差异及其与其他类型河流沉积的异同。结果从三维地震资料中获得了古代富泥低弯度河沉积的一些共同特征:古代富泥低弯度河多发育在干旱气候条件下的冲积扇扇缘和扇外;平面上可呈单河道体系,也可呈分支、交叉的多河道体系;单河道砂体规模小,一般仅数米厚;宽厚比小。结论三维地震识别出的低弯度河道一般为多期河道砂体相对发育的河道带。
Aim Ancient mud-rich low-sinuosity rivers are summarized and separated from meandering river so as to understand exactly the relative depositional characteristics and channel sandstone distribution.Insight into the mud-rich low-sinuosity rivers can help for reservoir characterization and prediction.Methods The distributing and extension of ancient low-sinuosity channel can be identified from 3-D seismic data.They are neither braided river nor meandering rivers.The characteristics of channel belts are compared with overbanks,and compared with deposition of other types of rivers in different basin and different geologic times.Results The common depositional characteristics of ancient mud-rich low-sinuosity river are realized:Ancient mud-rich low-sinuosity rivers are invariably developed in lower fan and frontier fan environment of dry climate.They are planar either mono-channel system or multi-channel system that braches or cross each other.A mono-channel sandbody is usually several-meter thick and small in scale and width-thickness ration.Conclusion Ancient mud-rich low-sinuosity channels identified from 3-D seismic data are possibly a river belt in which multi-phase channel sands likely deposited.
Aim Ancient mud-rich low-sinuosity rivers are summarized and separated from meandering river so as to understand exactly the relative depositional characteristics and channel sandstone distribution.Insight into the mud-rich low-sinuosity rivers can help for reservoir characterization and prediction.Methods The distributing and extension of ancient low-sinuosity channel can be identified from 3-D seismic data.They are neither braided river nor meandering rivers.The characteristics of channel belts are compared with overbanks,and compared with deposition of other types of rivers in different basin and different geologic times.Results The common depositional characteristics of ancient mud-rich low-sinuosity river are realized:Ancient mud-rich low-sinuosity rivers are invariably developed in lower fan and frontier fan environment of dry climate.They are planar either mono-channel system or multi-channel system that braches or cross each other.A mono-channel sandbody is usually several-meter thick and small in scale and width-thickness ration.Conclusion Ancient mud-rich low-sinuosity channels identified from 3-D seismic data are possibly a river belt in which multi-phase channel sands likely deposited.
引文
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[2]STANISTREETL G,CAIRNCROSS B,MCCARTHY TS.Low sinuosity and meandering bedload rivers of the Oka-vango Fan;channel confinement by vegetated leveeswithout fine sediment[J].Sedimentary Geology,1993,85(1):135-156.
[3]KIRKLAND J I.Using high resolution event stratigraphicmethods to develop taphofacies models in fine-grainedfluvial strata;an example from the Late Jurassic MorrisonFm[J].Abstracts with Programs-Geological Society of A-merica,1999,31(7):437-438.
[4]ZHANG Chun-sheng,LIU Zhong-bao.Shi Dong.Compar-ative sedimentology of a high-sinuosity river and a low-sinuosity river[J].Acta Sedimentologica Sinica,2000,18(2):227-233.
[5]何发岐,翟晓先,俞仁连,等.塔河油田石炭系卡拉沙依组沉积与成因分析[J].石油与天然气地质,2004,25(3):258-262.
[6]魏红红,彭惠群,李静群.鄂尔多斯盆地中部石炭—二叠系沉积相带与砂体展布[J].沉积学报,1999,17(3):248-251.
[7]唐黎明,何兴华.松辽盆地梨树凹陷泉头组沉积特征[J].石油与天然气地质,2002,23(3):266-273.
[8]卿崇文.松南张家屯地区下白垩统沉积相特征[J].天然气工业,2004,24(6):40-42.
[9]MIALL A D.A review of the braided-river depositionalenvironment[J].Earth Science Review,1977,13(1):1-62.
[10]王随继,任明达.根据河道形态和沉积物特征的河流新分类[J].沉积学报,1999,17(2):240-245.
[11]蒲仁海,梅志超,唐中华.准噶尔盆地东部侏罗系地震相[J].石油与天然气地质,1994,15(3):241-247.
[12]蒲仁海,梅志超,唐中华.准噶尔盆地东部侏罗系西山室组地震相分析[J].石油勘探与开发,1993,20(增刊):57-60.
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