东海陆架盆地丽水凹陷古新统明月峰组层序地层学模式
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摘要
丽水凹陷古新统明月峰组充填了一套滨浅海—三角洲砂泥质沉积,是重要的含油气层段。综合分析钻井、测井、地震及古生物资料,应用层序地层学理论,识别出明月峰组三级层序顶底界面、初次海泛面及最大海泛面,以海泛面为界划分低位、水进和高位体系域。根据明月峰组地质结构和地层发育的构造背景,建立了明月峰组层序地层模式,结果表明:明月峰组沉积时期受同沉积断层的控制,丽水凹陷呈现东部陡坡带、中部洼陷带、西部缓坡带的半地堑式构造格架样式。
Paleocene Mingyuefeng Formation was filled by shallow sea and deltaic arenaceous pelitic deposit,which is identified as an important oil/gas bearing segment in Lishui sag.By using sequence stratigraphy theory in combination with drilling,logging,seismic and palaeophyte data,the third order sequences of Mingyuefeng Formation,enclosing interface,initial transgression surface and maximum transgression surface were identified.The sequences are classified into low-stand tract,transgression tract and high-stand tract taking the transgression surface as the interfaces.The sequence stratigraphic pattern of Mingyuefeng Formation is established based on its geological structure and structural setting of the strata developing.The result indicates that the deposit process of Mingyuefeng Formation is controlled by growth faults,and the eastern actic region,central low-lying area and western gentle slope of Lishui sag present as half-graben structural framework.
Paleocene Mingyuefeng Formation was filled by shallow sea and deltaic arenaceous pelitic deposit,which is identified as an important oil/gas bearing segment in Lishui sag.By using sequence stratigraphy theory in combination with drilling,logging,seismic and palaeophyte data,the third order sequences of Mingyuefeng Formation,enclosing interface,initial transgression surface and maximum transgression surface were identified.The sequences are classified into low-stand tract,transgression tract and high-stand tract taking the transgression surface as the interfaces.The sequence stratigraphic pattern of Mingyuefeng Formation is established based on its geological structure and structural setting of the strata developing.The result indicates that the deposit process of Mingyuefeng Formation is controlled by growth faults,and the eastern actic region,central low-lying area and western gentle slope of Lishui sag present as half-graben structural framework.
引文
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[3]陈志勇.丽水—椒江凹陷油气潜力分析和勘探突破口的选择[J].中国海上油气(地质),1997,11(6):451-458.CHEN Zhi-yong.Analysis of hydrocarbon potential and selection of exploration prospect of Lishui and Jiaojiang sags[J].China Offshore Oil and Gas(Geology),1997,11(6):451-458.
[4]覃建雄,田景春,杨作升.东海盆地第三系层序地层学初探[J].成都理工学院学报,1998,25(4):504-510.QIN Jian-xiong,TIAN Jing-chun,YANG Zuo-sheng.A study on sequence stratigraphy of tertiary in the East Chi-na Sea Basin[J].Journal of Chengdu University of Technology,1998,25(4):504-510.
[5]武法东,陆永潮,李思田,等.东海陆架盆地第三系层序地层格架与海平面变化[J].地球科学,1998,23(1):13-19.WU Fa-dong,LU Yong-chao,LI Si-tian,et al.Tertia-ry sequence stratigraphic framework and sea-level changes in the East China Sea shelf basin[J].Earth Science,1998,23(1):13-19.
[6]赵省民,张正喜,吴必豪,等.东海陆架盆地古近—新近系高分辨率层序[J].地质力学学报,2002,8(3):239-246.ZHAO Xing-min,ZHANG Zheng-xi,WU Bi-hao,et al.A study on high-resolution sequence stratigraph of Paleogene-Neogene oil-bearing strata in shelf basin,East China Sea[J].Journal of Geomechanics,2002,8(3):239-246.
[7]姜亮.东海陆架盆地油气资源勘探现状及含油气远景[J].中国海上油气(地质),2003,17(1):1-5.JIANG Liang.Exploration status and perspective of pe-troleum resources in East China Sea shelf basin[J].China Offshore oil and Gas(Geology),2003,17(1):1-5.
[8]刘景彦,陈志勇,林畅松,等.东海丽水西次凹古新统明月峰组层序-体系域分析及沉积体系展布[J].沉积学报,2004,22(3):380-385.LIUJing-yan,CHENZhi-yong,LINChang-song,et al.Analysis on sequence-tracts and distribution of deposition-al systems of Paleocene Mingyuefeng Formation in west Lishui Sag,East China Sea[J].Acta Sedimentologica Sinica,2004,22(3):380-385.
[9]刘招君,董清水,王嗣敏,等.陆相层序地层学导论与应用[M].北京:石油工业出版社,2002:4.LIUZhao-jun,DONG Qing-shui,WANG Si-min,et al.Introduction to continental sequence stratigraphy and ap-plication[M].Beijing:Petroleum Industry Press,2002:4.
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