鄂西渝东区飞仙关组层序地层划分及演化
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摘要
运用层序地层理论及研究方法,利用野外露头、钻井岩心观察与测井、地震资料,对鄂西渝东区飞仙关组(T1f)地层开展层序地层研究,识别层序边界,建立地层格架。结果表明:鄂西渝东区T1f按岩性地层划分为4段,分别为飞一段(T1f1)～飞四段(T1f4),在T1f共识别出2个Ⅲ级层序(SQ1和SQ2)并进一步将飞三段(T1f3)～飞四段(T1f4)地层划分为3个Ⅳ级层序(Ssq1、Ssq2和Ssq3)。重点对飞仙关组Ⅳ级层序进行分析,认为建南地区T1f发生了3期相对海平面升降,形成了3期鲕粒滩,鲕粒滩存在自西向东迁移趋势,层位逐渐抬高,且主要位于高位体系域中的台地边缘相带。
A sequence stratigraphic study was carried out on Feixianguan Formation of Western Hubei-Eastern Chongqing Area based on the theories and methodologies of sequence stratigraphy,the sequence stratigraphic boundary was recognized and the sequence stratigraphic framework was established.The result shows that according to their litho-stratigraphic proerties,Feixianguan Formation of Western Hubei-Eastern Chongqing Area can be divided into 4 sections Sections Fei 1 to Fei 4.Feixianguan Formation can be divided into two third-order sequences(namely SQ1 and SQ2).And Sections Fei 3~4 can be further divided into 3 four-order sequences(namely sq1,sq2 and sq3).Based on a detailed analysis of the four-order sequence of Feixianguan Formation,it is considered that 3 relative sea level fluctuations are induced in Feixianguan Formation,3 oolitic beaches are formed,which tend to be migrated from the west to east and with their horizons uplifting gradually,it is located in the marginal of platform of the highstand system.
A sequence stratigraphic study was carried out on Feixianguan Formation of Western Hubei-Eastern Chongqing Area based on the theories and methodologies of sequence stratigraphy,the sequence stratigraphic boundary was recognized and the sequence stratigraphic framework was established.The result shows that according to their litho-stratigraphic proerties,Feixianguan Formation of Western Hubei-Eastern Chongqing Area can be divided into 4 sections Sections Fei 1 to Fei 4.Feixianguan Formation can be divided into two third-order sequences(namely SQ1 and SQ2).And Sections Fei 3~4 can be further divided into 3 four-order sequences(namely sq1,sq2 and sq3).Based on a detailed analysis of the four-order sequence of Feixianguan Formation,it is considered that 3 relative sea level fluctuations are induced in Feixianguan Formation,3 oolitic beaches are formed,which tend to be migrated from the west to east and with their horizons uplifting gradually,it is located in the marginal of platform of the highstand system.
引文
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[3]徐强,刘宝,何汉漪,等.四川晚二叠世生物礁层序地层岩相古地理编图[J].石油学报,2004,25(2):47～50.
[4]牟传龙,谭钦银,余谦,等.川东北地区上二叠统长兴组生物礁组成及成礁模式[J].沉积与特提斯地质,2004,24(3):65～71.
[5]马永生,郭旭升,凡睿.川东北普光气田飞仙关组鲕滩储集层预测[J].石油勘探与开发,2005,32(4):60～64.
[6]马永生,牟传龙,郭彤楼,等.四川盆地东北部长兴组层序地层与储层分布[J].地学前缘,2005,12(3):179～185.
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[8]王兴志,张帆,马青,等.四川盆地东部晚二叠世-早三叠世飞仙关期礁、滩特征与海平面变化[J].沉积学报,2002,20(2):249～254.
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[10]马永生,牟传龙,谭钦银,等.关于开江-梁平海槽的认识[J].石油与天然气地质,2006,27(3):326～331.
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