歧口凹陷沙二段精细层序地层划分
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摘要
以经典层序地层学理论为指导,对地质、岩心、钻井、测井及地震等资料进行综合分析,将歧口凹陷沙二段从下往上划分为2个三级层序SQ1和SQ2,对应层序界面为SB1和SB2,并在层序内部划分至体系域级别。层序界面在地震反射终端和岩性、电性等方面都具有明显的鉴别特征。其中SB1界面类型为构造成因的较高角度削截不整合面,可作为沙河街组内部的1个二级超层序界面;SB2为受湖平面变化控制的典型的三级层序界面。2个层序的划分反映了沙二段时期工区经历了2次较大规模的湖平面升降。
The Es2 member in Qikou Depression has been divided into 2 third-class sequences of SQ1 and SQ2 from below with corresponding sequence interfaces being SB1 and SB2 through comprehensive analysis of geological,coring,drilling,logging and seismic data on the basis of typical sequence stratigraphy.The hierarchy of system tract is divided inside the sequence.The sequence interfaces show evident identifying characteristics in seismic reflection terminal,lithology,and electrical property.The SB1 interface is a high-angle truncated unconformity of tectonic genesis,and can serves as a second-class supersequence interface within Shahejie formation;the SB2 is a typical third-class sequence interface controlled by the change of lake level.These 2 sequences indicate that the study area had experienced twice large-scale lake level changes during Es2 period.
The Es2 member in Qikou Depression has been divided into 2 third-class sequences of SQ1 and SQ2 from below with corresponding sequence interfaces being SB1 and SB2 through comprehensive analysis of geological,coring,drilling,logging and seismic data on the basis of typical sequence stratigraphy.The hierarchy of system tract is divided inside the sequence.The sequence interfaces show evident identifying characteristics in seismic reflection terminal,lithology,and electrical property.The SB1 interface is a high-angle truncated unconformity of tectonic genesis,and can serves as a second-class supersequence interface within Shahejie formation;the SB2 is a typical third-class sequence interface controlled by the change of lake level.These 2 sequences indicate that the study area had experienced twice large-scale lake level changes during Es2 period.
引文
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[2]王德发,张服民.黄骅坳陷第三系沉积相及沉积环境[M].北京:地质出版社,1987:10～32.
[3]宋琨,范乐元.黄骅坳陷北大港构造带古近系沙河街组层序地层框架和岩相古地理研究[J].西安石油大学学报(自然科学版),2006,21(5):24～29.
[4]黄建军,纪友亮.华北黄骅坳陷层序地层学研究——以白水头—唐家河地区Es1-Nm为例[J].天然气工业,2007,27(1):20～23.
[5]孙家振,李兰斌.地震地质综合解释教程[M].武汉:中国地质大学出版社,2002:114～139.
[6]徐怀大,王世凤,陈开远.地震地层学解释基础[M].武汉:中国地质大学出版社,1990:1～50.
[7]Galloway,W E.Siliciclastic slope and base of slope dep-ositional system:component facies,stratigraphic architec-ture,and classification[J].AAPG,1998:569～594.
[8]Van Wagoner et al.Siliciclastic Sequence Stratigraphy in Well logs,Cores and outcrops-concept for high Resolu-tion correlation of times and facies[J].AAPG,1990:1～54.
[9]威尔格斯C K,等著.见:徐怀大,等译.层序地层学原理(海平面变化综合分析)[M].北京:石油工业出版社,1992:49～55.
[10]邓宏文,王洪亮,祝永军,等.高分辨率层序地层学原理及应用[M].北京:地质出版社,2002:1～15.
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