冀中坳陷沉积演化与岩性油气藏勘探
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摘要
利用大量钻井、测井、地震信息,结合古生物等分析资料,对冀中坳陷古近系层序格架及沉积演化进行了研究,系统划分出1个一级层序、3个二级层序和13个三级层序,构建了沉积演化经历的5种沉积充填样式和完整的断陷-坳陷期沉积充填序列,探讨了纵向上的上、中、下3套成油组合与岩性油气藏的分布关系。依据构造背景、层序类型和沉积体系"三要素",在陡坡、洼槽、斜坡和洼中隆起带细分出4类、20种构造岩相带类型,并按不同成油组合对浅-深层岩性油气藏有利勘探区带进行了综合评价,优选出了14种有利构造岩相带,指出了有利勘探方向,有效地指导了岩性油气藏勘探。
Based on analyses of a large amount of drilling data,logging curves,seismic information and paleontologic fossils,the sequence framework and depositional evolution of paleogene in Jizhong depression were studied.The results show that the strata of paleogene can be divided into one first-order sequence,three second-order sequences and thirteen third-order sequences.The depositional evolution of paleogene has experienced five filling types and made a vertical filling series from fault-subsidence to depression period.Moreover,the relationships between three oil-bearing groups in upper,middle and lower parts of vertical section and distribution of lithologic reservoir were investigated.According to three geological key elements including structural setting,sequence types and sedimentary systems,four types and twenty kinds of structure-petrographical,zonations are summarized in different zones,such as steep slope,sub-sag area,gentle slope and central uplift.For different oil-bearing groups,comprehensive evaluation for favorable exploration zones from shallow to deep strata was conducted.Fourteen types of structure-petrographical zonations were finally selected as favorable exploration zones.The work can provide reference for exploration of lithologic reservoir effectively.
Based on analyses of a large amount of drilling data,logging curves,seismic information and paleontologic fossils,the sequence framework and depositional evolution of paleogene in Jizhong depression were studied.The results show that the strata of paleogene can be divided into one first-order sequence,three second-order sequences and thirteen third-order sequences.The depositional evolution of paleogene has experienced five filling types and made a vertical filling series from fault-subsidence to depression period.Moreover,the relationships between three oil-bearing groups in upper,middle and lower parts of vertical section and distribution of lithologic reservoir were investigated.According to three geological key elements including structural setting,sequence types and sedimentary systems,four types and twenty kinds of structure-petrographical,zonations are summarized in different zones,such as steep slope,sub-sag area,gentle slope and central uplift.For different oil-bearing groups,comprehensive evaluation for favorable exploration zones from shallow to deep strata was conducted.Fourteen types of structure-petrographical zonations were finally selected as favorable exploration zones.The work can provide reference for exploration of lithologic reservoir effectively.
引文
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[3]纪友亮,杜金虎,赵贤正,等.饶阳凹陷古近系层序发育的控制因素分析[J].沉积学报,2007,25(2):161-168.JI Youliang,DU Jinhu,ZHAO Xianzheng,et al.Se-quence stratigraphy models and controlling factors ofeogene in raoyang depression[J].Acta SedimentologicaSinica,2007,25(2):161-168.
[4]信荃麟,刘泽容.含油气盆地构造岩相分析[M].北京:地质出版社,1993:253-260.XIN Quanlin,LIU Zerong.Structure-petrography a-nalysis of oil-bearing basin[M].Beijing:GeologicalPublishing House,1993:253-260.
[5]邹才能,池英柳,李明,等.陆相层序地层学分析技术[M].北京:石油工业出版社,2004:175-183.ZOU Caineng,CHI Yingliu,LI Ming,et al.Analysistechnology of terrestrial sequence stratigraphy[M].Beijing:Petroleum Industry Press,2004:175-183.
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