珠江口盆地番禺4洼陷文昌组层序地层划分
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摘要
番禺4(番遇4)洼陷为珠江口盆地珠一坳陷西侧一个相对独立的"小而肥"的富生烃洼陷,古近系分割性强、地震反射杂乱,且钻井勘探程度很低,前人尚未对文昌组进行过深入研究。以经典层序地层学理论为指导,通过对地质、岩心、钻井、测井及地震等资料的综合分析,并以物源和构造分析作重要辅助,将番禺4洼文昌组从下往上划分为3个层序SQ1、SQ2和SQ3,其中SQ2层序内部又划分为3个次一级的层序单元SQ2a、SQ2b和SQ2c,对应的层序界面分别为SB1、SB2a、SB2b、SB2c、SB3,查明了层序界面在地震反射终端、岩性及电性等方面的鉴别特征,认为层序SQ1、SQ2和SQ3沉积时期分别对应于断陷湖盆发育过程中的初始断陷期、扩张期和萎缩期。
Under the construction of the theory of typical sequence stratigraphy and by assistance of analysis of the material sources and structure,Wenchang Formation in Fanyu 4 Depression is subdivided into 3 sequences through comprehensive analysis of geologic,core,drilling,logging and seismic data.They are successive from the bottom to the top,named SQ1,SQ2 and SQ3.However,sequence SQ2 is further subdivided into 3 sequences respectively,from the bottom to the top,they are SQ2a,SQ2b,SQ2c.these sequences are respectively correspond to sequence boundary SB1,SB2a,SB2b,SB2c,SB3.Sequence boundaries have distinctive features in seismic reflection terminal,lithology and electric property.The deposition periods of sequences SQ1,SQ2 and SQ3 are respectively corresponding to the initial rift period,extensional period and suppression period in the development process of the rift basin.
Under the construction of the theory of typical sequence stratigraphy and by assistance of analysis of the material sources and structure,Wenchang Formation in Fanyu 4 Depression is subdivided into 3 sequences through comprehensive analysis of geologic,core,drilling,logging and seismic data.They are successive from the bottom to the top,named SQ1,SQ2 and SQ3.However,sequence SQ2 is further subdivided into 3 sequences respectively,from the bottom to the top,they are SQ2a,SQ2b,SQ2c.these sequences are respectively correspond to sequence boundary SB1,SB2a,SB2b,SB2c,SB3.Sequence boundaries have distinctive features in seismic reflection terminal,lithology and electric property.The deposition periods of sequences SQ1,SQ2 and SQ3 are respectively corresponding to the initial rift period,extensional period and suppression period in the development process of the rift basin.
引文
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[3]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.
[4]Galloway,W.E.Siliciclastic slope and base of slope depositional system:component facies,stratigraphic architecture,and classifica-tion[J],AAPG Bulletin,1998,82(4):569～594.
[5]Van Wagoner et al.Siliciclastic Sequence Stratigraphy in Well logs,Cores and outcrops-concept for high Resolution correlation of times and facies[J].AAPG Bulletin,1990,74(1):1～54.
[6]威尔格斯C K等.层序地层学原理(海平面变化综合分析)[M].徐怀大译.北京:石油工业出版社,1992:49～55.
[7]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.
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