东岭地区营城组层序特征与沉积演化
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摘要
以层序地层学理论为指导,通过层序地层的划分与对比,将营城组地层划分为4个沉积层序和一个火山岩夹层。根据取芯资料、测井资料,并结合古生物、岩石薄片、粒度等综合分析的结果,将营城组地层发育的沉积相类型分为扇三角洲相和湖泊相。利用地震反演手段预测了砂体的平面分布,用波形分类技术进行了地震相分析,结合单井沉积微相的划分结果,综合预测了营城组沉积相平面分布特征,分析了其在平面上的变化规律。东岭地区营城组沉积时期,为一个完整的超层序发育过程,沉积相总体上呈近东西向展布,北东向相带变化明显的特点,物源充足,来自北东向。总体上构成一个向上变粗的进积序列,反映了湖平面从扩张到收缩的沉积特征。
Based on the sequence stratigraphy theory,this paper subdivided the Yingcheng Formation into four sedimentary sequences and one volcanic intercalation by means of sequence stratigraphic classification and comparison.According to the analysis of coring data,logging data,palaeontological characteristics,rock slices and grain sizes,the sedimentary facies in Yingcheng Formation should include fan-delta subfacies and lakes subfacies.On plane,the authors used seismic inversion tools to predict the distribution of sand and employed seismic waveform classification technology to do seismic face analysis.With the division results of the microfacies in individual wells,a comprehensive forecast was made for sedimentary facies distribution in Yingcheng Formation,and the evolution regularity on plane was analyzed.During the deposition of the Yingcheng Formation,there was a complete sequence development process in Dongling area.The sedimentary facies assumes an overall EW-striking spreading,with obvious variations in the NE direction.Material source from the northeast was adequate,and the sedimentary facies on the whole formed an integral sequence sedimentary sequence,reflecting the sedimentary characteristics of the lacustrine plane from expansion to shrinkage.
Based on the sequence stratigraphy theory,this paper subdivided the Yingcheng Formation into four sedimentary sequences and one volcanic intercalation by means of sequence stratigraphic classification and comparison.According to the analysis of coring data,logging data,palaeontological characteristics,rock slices and grain sizes,the sedimentary facies in Yingcheng Formation should include fan-delta subfacies and lakes subfacies.On plane,the authors used seismic inversion tools to predict the distribution of sand and employed seismic waveform classification technology to do seismic face analysis.With the division results of the microfacies in individual wells,a comprehensive forecast was made for sedimentary facies distribution in Yingcheng Formation,and the evolution regularity on plane was analyzed.During the deposition of the Yingcheng Formation,there was a complete sequence development process in Dongling area.The sedimentary facies assumes an overall EW-striking spreading,with obvious variations in the NE direction.Material source from the northeast was adequate,and the sedimentary facies on the whole formed an integral sequence sedimentary sequence,reflecting the sedimentary characteristics of the lacustrine plane from expansion to shrinkage.
引文
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[2]辛仁臣,蔡希源,王英民.松辽坳陷深水湖盆层序界面特征及低位域沉积模式[J].沉积学报,2004,22(3):379-392.
[3]刘招君,董清水,王嗣民,等.陆相层序地层[M].北京:地质出版社,2002.
[4]解习农,李思田.陆相盆地层序地层研究特点[J].地质科技情报,1992,12(1):22-26.
[5]赵澄林,朱筱敏.沉积岩石学[M].北京:石油工业出版社,2001.
[6]冯增昭,王英华,刘焕杰,等.中国沉积学[M].北京:石油工业出版社,1994:153-166,347-549.
[7]吴磊,徐怀民,季汉成.渤海湾盆地渤中凹陷古近系沉积体系演化及物源分析[J].海洋地质与第四纪地质,2006,26(1):81-88.
[8]李慧勇,辛仁臣,李强,等.黄河口凹陷A区古近系沙河街组三段沉积相[J].古地理学报.2007,9(1):25-32.
[9]李延平,陈树民,宋永忠,等.大庆长垣及以东泉三、四段扶杨油层浅水湖泊—三角洲体系沉积特征[J].大庆石油地质与开发,2005,24(5):13-16.
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