摘要
利用岩芯、薄片、测录井以及测试分析等资料,结合区域地质,研究了渤海湾盆地饶阳凹陷大王庄地区古近系沙三上亚段(Es3^上)I油组发育的混积岩特征,分析了其沉积环境,探讨了其沉积模式。研究结果表明:大王庄地区古近系沙三上亚段I油组混积岩分为(含)陆源碎屑质—碳酸盐岩和(含)碳酸盐质—陆源碎屑岩两大类,以灰(云)质砂岩、砂质泥晶云岩为主,(含)陆源碎屑质—碳酸盐岩主要分布于工区中部和北部,(含)碳酸盐质—陆源碎屑岩分布于西部和南部;混积成因类型以原地混合和相源混合为主,相源混合出现于Es3^上I油组早中期,原地混合出现于Es3^上I油组早期;少量母源混合出现于Es3^上I油组晚期。饶阳凹陷大王庄地区古近系沙三上亚段I油组沉积环境主要位于滨浅湖,可划分为砂质混积滩坝沉积、碳酸盐岩混积滩坝沉积以及滨浅湖泥混积3种沉积微相类型。综合分析湖平面变化、构造演化、古地貌等对混合沉积的控制作用,建立了湖平面先稳定上升后下降的混积岩沉积模式:随着湖平面的缓慢上升,混合沉积呈增多趋势,以相源混合和原地混合为主;当湖平面到达一定高度时,纯碳酸盐岩增多,混合沉积减少,以相源混合为主;后期,湖平面下降,可能形成母源混合沉积。
Based on core data,microphotographs,well⁃logging and test analysis,etc.,combined with regional geo⁃logical data,the characteristics of mixed rocks in oil group I of the upper third member of the Paleogone Shahejie For⁃mation in the Dawangzhuang area,Raoyang Sag,Bohai Bay Basin,were studied.The sedimentary environment was analyzed,and the sedimentary model was explored.The study shows that the mixed rocks may be divided into two cat⁃egories:siliciclastic carbonate rocks and carbonate siliciclastic rocks.Mainly sandy dolomite and calcareous sand⁃stone occur in the Dawangzhuang area,with mainly siliciclastic carbonate rocks in the central and northern areas,and carbonate siliciclastic rocks in the west and south.The genetic types of mixed sedimentation are dominated by fa⁃cies mixing in the early and middle stage of oil group I of the upper third member of the Paleogone Shahejie Formation oil group,and by in situ mixing in the early stage of oil group I of the upper third member of the Paleogone Shahejie Formation oil group.A few cases of source mixing were found in the late stage of oil group I of the upper third member of the Paleogone Shahejie Formation oil group in the study area.The sedimentary environment of the mixed sedimenta⁃tion of carbonates is mainly shore⁃shallow lake in the Dawangzhuang area,classified into three kinds of mixed depos⁃its:sandstone bar microfacies,carbonate bar microfacies,and muddy shore⁃shallow lake microfacies.A comprehen⁃sive analysis of the effect of lake level variation on mixed deposition,together with tectonic evolution and paleogeo⁃morphology,revealed a sedimentary model of mixed rocks during steadily rising,then falling,lake levels.When the lake level was slowly rising,the mixed deposits characterized by both facies mixing and in situ mixing gradually in⁃creased.When the lake level was suitable,the content of pure carbonate rocks increased and facies mixing de⁃creased.Later,when the lake level was falling,source mixing was evident.
作者
罗妮娜
侯守探
纪友亮
吕文睿
张艺楼
陈佩磊
李圣明
张兰
LUO NiNa;HOU ShouTan;JI YouLiang;LÜWenRui;ZHANG YiLou;CHEN PeiLei;LI ShengMing;ZHANG Lan(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;No.3 Oil Recovery Plant of PetroChina Huabei Oilfield,Cangzhou,Heibei 062450,China;Huabei Oilfield Exploration Institute,CNPC,Renqiu,Hebei 062552,China)
出处
《沉积学报》
CAS
CSCD
北大核心
2020年第5期1037-1048,共12页
Acta Sedimentologica Sinica
基金
国家自然科学基金项目(41672098)。
关键词
饶阳凹陷
大王庄地区
沙三上亚段
混积岩成因类型
混积模式
Raoyang Sag
Dawangzhuang area
upper third member of Shahejie Formation
genesis types for mixed rocks
mixed sedimentation models
