陆西凹陷九佛堂组层序格架及其与岩性圈闭的关系
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摘要
依据地震、岩心和测井资料,对陆西凹陷下白垩纪九佛堂组开展层序地层学研究并分析层序格架内岩性圈闭发育情况。结果表明:九佛堂组可划分为1个三级层序,层序内可识别出初次湖泛面和最大湖泛面并划分低位、湖侵和高位体系域;低位体系域发育近岸水下扇和辫状河三角洲,湖侵体系域发育近岸水下扇和曲流河三角洲,而高位体系域发育曲流河、辫状河三角洲和扇三角洲,3个体系域均发育滑塌浊积扇;低位和湖侵体系域各类成因砂体储集物性差,不利于岩性圈闭发育,而高位体系域发育在五十家子庙洼陷和包日温都断裂带曲流河三角洲前缘、辫状河三角洲前缘、扇三角洲前缘的砂体和滑塌浊积扇砂体物性好,前3类砂体可形成砂岩上倾尖灭型岩性圈闭,滑塌浊积扇砂体可形成砂岩透镜体型岩性圈闭。
According to the comprehensive analysis of seismic,core and logging data,sequence stratigraphy and lithological traps in sequence framework were researched in Jiufotang formation of lower Cretaceous in Luxi depression.The results show that Jiufotang formation was divided into a third order sequence and three system tracts based on the recognization of first flooding surface and maxium flooding surface.Subaqueous fan and braided river delta developed in lowstand system tract,subaqueous fan and meandering river delta developed in transgressive system tract,meandering river and braided river deltas and fan-delta developed in highstand system tract,and slump turbidite fan developed in all three system tracts.Sand bodies developed in lowstand and transgressive system tracts had poor reservoir physical properties and were not suitable for development of lithological traps.Sand bodies developed in the front of meandering river delta,braided river delta and fan-delta in Wushijiazimiao depression belt and Baoriwendu fault zone had preferable physical properties and could form updip pinchout lithologic traps.And sand bodies of slump turbidite fans had preferable physical properties and could form sand lentic lithologic traps.
According to the comprehensive analysis of seismic,core and logging data,sequence stratigraphy and lithological traps in sequence framework were researched in Jiufotang formation of lower Cretaceous in Luxi depression.The results show that Jiufotang formation was divided into a third order sequence and three system tracts based on the recognization of first flooding surface and maxium flooding surface.Subaqueous fan and braided river delta developed in lowstand system tract,subaqueous fan and meandering river delta developed in transgressive system tract,meandering river and braided river deltas and fan-delta developed in highstand system tract,and slump turbidite fan developed in all three system tracts.Sand bodies developed in lowstand and transgressive system tracts had poor reservoir physical properties and were not suitable for development of lithological traps.Sand bodies developed in the front of meandering river delta,braided river delta and fan-delta in Wushijiazimiao depression belt and Baoriwendu fault zone had preferable physical properties and could form updip pinchout lithologic traps.And sand bodies of slump turbidite fans had preferable physical properties and could form sand lentic lithologic traps.
引文
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[4]肖乾华,刘晓峰,孙素青.陆家堡凹陷上侏罗统层序地层研究[J].河南石油,1999,13(1):10-13,25.XIAO Qian-hua,LIUXiao-feng,SUN Su-qing.Srata se-quence of upper Jurassic in Lujiabao sag[J].Henan Pe-troleum,1999,13(1):10-13,25.
[5]朱筱敏,王贵文,马立驰,等.内蒙古东部陆西凹陷中北部上侏罗统层序地层格架及体系域特征分析[J].古地理学报,2002,4(3):33-39.ZHU Xiao-min,WANG Gui-wen,MA Li-chi,et al.Se-quence framework and characteristics of systems tracts ofthe upper Jurassic in the middle-northern Luxi depressionof Inner Mongolia[J].Journal of Palaeogeography,2002,4(3):33-39.
[6]朱筱敏,王贵文,李滨阳,等.开鲁盆地陆西凹陷下白垩统层序地层学和油气评价[J].沉积学报,2002,20(4):531-536,567.ZHU Xiao-min,WANG Gui-wen,LI Bin-yang,et al.Lower Cretaceous sequence stratigraphy and hydrocarbonevaluation of Luxi depression in Kailu Basin[J].ActaSedimentologica Sinica,2002,20(4):531-536,567.
[7]张一伟,张卫海,查明,等.勘探早期盆地分析与油气评价[M].北京:地质出版社,1998:1-117.
[8]郑福长,张先慎,刘建英,等.开鲁盆地陆家堡坳陷石油地质概况[J].石油与天然气地质,1989,10(1):83-88.ZHENG Fu-chang,ZHANG Xian-shen,LIU Jian-ying,et al.A study of petroleum geology on Lujiabao depres-sion of Kailu Basin[J].Oil&Gas Geology,1989,10(1):83-88.
[9]张辉.内蒙古东部陆西凹陷油气成藏条件与分布规律[J].大庆石油学院学报,2006,30(2):1-4.ZHANG Hui.Formation conditions and distribution lawsof oil reservoirs in Luxi depression of eastern Inner Mon-goli[J].Journal of Daqing Petroleum Institute,2006,30(2):1-4.
[10]朱筱敏.层序地层学[M].东营:石油大学出版社,2003:17-42.
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