琼东南盆地渐新世崖城组基准面旋回划分与转换机制
摘要
从钻井岩心、测井、地震、构造沉降和全球海平面变化方面研究了琼东南盆地渐新世崖城组的基准面旋回特征和转换机制.岩心主要用于识别短周期基准面旋回,用岩心标定测井曲线后,可用测井曲线叠加识别出中周期旋回,并据此建立起中短周期基准面旋回的测井模式,可以识别无心井段的基准面旋回.长周期和超长周期旋回则主要利用地震剖面中反映地层不协调关系的上超、下超、削蚀等反射终止类型来识别.在此过程中,岩心、测井与地震三者需要互相验证.文中用地层回剥法恢复了崖城组地层厚度并计算出各凹陷的构造沉降速率为312.5~750 m/Ma.结果表明:崖城组可以划分为1个超长周期、3个长周期和至少12个中周期旋回层序,短周期旋回层序类型发育齐全但数目变化较快.研究区的构造沉降速率远大于全球海平面变化速率(0.2~40 m/Ma),说明基准面旋回的发育和转换受构造沉降的控制程度明显大于全球海平面变化.
Based on the data of borehole cores,geophysical loggings,seismic reflections,the characteristics and switch mechanism of base level cycles of Oligocene Epoch Yacheng formation in the Qiongdongnan basin were studied.The lithologies of core samples was used to identify short-period base-level cycles.The logging curves,calibrated with the core data,were used to recognize the mid-period cycles.A template using logging curves to identify the hierarchy of middle and short-period cycles wasestablished,which can recognize the base level cycle in non-coring section.The termination styles of reflections in seismic profile,including onlap,downlap and truncation,which reflect the incompatibility of strata,can identify the long and super long-period cycles.By restoring the thickness of Yacheng formation by a strata-stripping method,the tectonic subsidence rate of each sag of 312.5-750 m/Ma was achieved.The results show that the Yacheng fromation can be subdivided into 1 super long period,3 long period and at least 12 mid-peroiod cycle sequences.The short-period cycle types are complete,but their number varies largely in different locations.The tectonic subsidence rate was much higher than the global sea-level change rate of 0.2-40 m/Ma,which show that the development of base-level cycles and switch mechanism in this area were controlled more obviously by tectonic subsidence than by global sea-level change.
Based on the data of borehole cores,geophysical loggings,seismic reflections,the characteristics and switch mechanism of base level cycles of Oligocene Epoch Yacheng formation in the Qiongdongnan basin were studied.The lithologies of core samples was used to identify short-period base-level cycles.The logging curves,calibrated with the core data,were used to recognize the mid-period cycles.A template using logging curves to identify the hierarchy of middle and short-period cycles wasestablished,which can recognize the base level cycle in non-coring section.The termination styles of reflections in seismic profile,including onlap,downlap and truncation,which reflect the incompatibility of strata,can identify the long and super long-period cycles.By restoring the thickness of Yacheng formation by a strata-stripping method,the tectonic subsidence rate of each sag of 312.5-750 m/Ma was achieved.The results show that the Yacheng fromation can be subdivided into 1 super long period,3 long period and at least 12 mid-peroiod cycle sequences.The short-period cycle types are complete,but their number varies largely in different locations.The tectonic subsidence rate was much higher than the global sea-level change rate of 0.2-40 m/Ma,which show that the development of base-level cycles and switch mechanism in this area were controlled more obviously by tectonic subsidence than by global sea-level change.
引文
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[10]魏魁生,崔旱云,叶淑芬,等.琼东南盆地高精度层序地层学研究[J].地球科学:中国地质大学学报,2001,26(1):59-66.WEI Kui-sheng,CUI Han-yun,YE Shu-fen.High-precicision sequence stratigraphy in Qiongdongnanbasin[J].Earth Science:Journal of China Universi-ty Geosciences,2001,26(1):59-66.
[11]郑荣才,尹世民,彭军.基准面旋回结构与叠加样式的沉积动力学分析[J].沉积学报,2000,18(3):369-375.ZHENG Rong-cai,YIN Shi-min,PENG Jun.Sedi-mentary dynamic analysis of sequence structure andstacking pattern of base-level cycle[J].Acta Sedim-entology Sinica,2000,18(3):369-375.
[12]李思田,林畅松,张启明,等.南海北部大陆边缘盆地幕式裂陷的动力过程及10 Ma以来的构造事件[J].科学通报,1998,43(8):797-910.LI Si-tian,LIN Chang-song,ZHANG Qi-ming,etal.Northern south China sea continental margin epi-sodic rifting of the dynamic process and tectonic e-vents since 10ma[J].Science Bulletin,1998,43(8):797-910.
[13]余继峰,李增学,王明镇,等.鲁西-济阳C-P陆表海沉积测井层序对比分析[J].中国矿业大学学报,2007,36(1):85-90.YU Ji-feng,LI Zeng-xue,WANG Ming-zhen,etal.Correlation and analysis of well-log sequences ofepicontinental sea sediments of permo-carboniferousin Luxi and Jiyan[J].Journal of China University ofMining&Technology,2007,36(1):85-90.
[14]邓宏文,王红亮,祝永军.高分辨率层序地层学:应用及原理[M].北京:地质出版社,2002.
[15]RAVNAS R,STEEL R J.Architecture of marinerift-basin successions[J].AAPG Bull,1998,82:110-146.
[2]王嘹亮,程日辉,李飞,等.南海北部陆缘中生代沉积层序、对比和油气地质意义[J].吉林大学学报:地球科学版,2009,39(2):175-183.WANG Liao-liang,CHENG Ri-hui,LI Fei,et al.The mesozoic sedimentary sequences,correlation andgeological significance for petroleum of the northmargin of south China sea[J].Journal of Jilin Uni-versity:Earth Science Edition,2009,39(2):175-183.
[3]严德天,王华,王家豪,等.黄骅坳陷沙河街组层序地层样式及隐蔽圈闭预测[J].中国矿业大学学报,2008,37(1):30-38.YAN De-tian,WANG Hua,WANG Jia-hao,et al.Sequence stratigraphic rattern and forecast of subtlereservoir of the Shahejie formation in Huanghua de-pression[J].Journal of China University of Mining&Technology,2008,37(1):30-38.
[4]赵省民,王计堂,吴必豪,等.高分辨率层序地层学在东海古新近系油气地质条件预测中的应用[J].海洋地质与第四纪地质,2007,27(4):61-66.ZHAO Xing-min,WANG Ji-tang,WU Bi-hao,etal.Application of high-resolution sequence stratigra-phy to prediction of tertiary petroleum geological ele-ments in east China sea shelf basin[J].Marine Geol-ogy&Quaternary Geology,2007,27(4):61-66.
[5]许红,陆永潮,施和生,等.南沙群岛海域北康盆地生物礁高精度层序地层学及其新近纪生物礁层序演化模式[J].热带海洋学报,2009,28(2):48-54.XU Hong,LU Yong-chao,SHI He-sheng,et al.High precision organic reef sequence stratigraphy ofBeikang basin and sequence evolution model of neo-gene organic reefs in nansha islands sea area[J].Journal of Tropical Oceanography,2009,28(2):48-54.
[6]李绪宣,刘宝明,赵俊青.琼东南盆地古近纪层序结构、充填样式及生烃潜力[J].中国海上油气,2007,19(4):217-239.LI Xu-xuan,LIU Bao-ming,ZHAO Jun-qing.Paleo-gene sequence contifiguration,depositional fillingpattern and hydrocarbon-generation potential in Qion-gdongnan basin[J].Ghina Offshore Oil and Gas,2007,19(4):217-239.
[7]李绪宣,钟志洪,董伟良,等.琼东南盆地古近纪裂陷构造特征及其动力学机制[J].石油勘探与开发,2006,33(6):713-722.LI Xu-xuan,ZHONG Zhi-hong,DONG Wei-liang,et al.Paleogene rift structure and its dynamics ofQiongdongnan basin[J].Petroleum Exploration andDevelopment,2006,33(6):713-722.
[8]付国民,郑荣才,赵俊兴,等.鄂尔多斯盆地环县地区延安组高分辨率层序地层学特征[J].中国矿业大学学报,2005,34(3):394-399.FU Guo-min,ZHENG Rong-cai,ZHAO Jun-xing,et al.High resolution sequence stratigraphic charac-teristics of Yan'an formation in huanxian county of or-dos basin[J].Journal of China University of Mining&Technology,2005,34(3):394-399.
[9]杜振川,丁述理,魏魁生.琼东南盆地第三纪高分辨率层序地层划分特征[J].辽宁工程技术大学学报:自然科学版,2002,21(6):709-712.DU Zhen-chuan,DING Shu-li,WEI Kui-sheng.High-resolution sequence division and its petroleu-geological significance in tertiary period of Qiong-dongnan basin[J].Journal of Liaoning TechnicalUnivetsity:Natural Scinece Edition,2002,21(6):709-712.
[10]魏魁生,崔旱云,叶淑芬,等.琼东南盆地高精度层序地层学研究[J].地球科学:中国地质大学学报,2001,26(1):59-66.WEI Kui-sheng,CUI Han-yun,YE Shu-fen.High-precicision sequence stratigraphy in Qiongdongnanbasin[J].Earth Science:Journal of China Universi-ty Geosciences,2001,26(1):59-66.
[11]郑荣才,尹世民,彭军.基准面旋回结构与叠加样式的沉积动力学分析[J].沉积学报,2000,18(3):369-375.ZHENG Rong-cai,YIN Shi-min,PENG Jun.Sedi-mentary dynamic analysis of sequence structure andstacking pattern of base-level cycle[J].Acta Sedim-entology Sinica,2000,18(3):369-375.
[12]李思田,林畅松,张启明,等.南海北部大陆边缘盆地幕式裂陷的动力过程及10 Ma以来的构造事件[J].科学通报,1998,43(8):797-910.LI Si-tian,LIN Chang-song,ZHANG Qi-ming,etal.Northern south China sea continental margin epi-sodic rifting of the dynamic process and tectonic e-vents since 10ma[J].Science Bulletin,1998,43(8):797-910.
[13]余继峰,李增学,王明镇,等.鲁西-济阳C-P陆表海沉积测井层序对比分析[J].中国矿业大学学报,2007,36(1):85-90.YU Ji-feng,LI Zeng-xue,WANG Ming-zhen,etal.Correlation and analysis of well-log sequences ofepicontinental sea sediments of permo-carboniferousin Luxi and Jiyan[J].Journal of China University ofMining&Technology,2007,36(1):85-90.
[14]邓宏文,王红亮,祝永军.高分辨率层序地层学:应用及原理[M].北京:地质出版社,2002.
[15]RAVNAS R,STEEL R J.Architecture of marinerift-basin successions[J].AAPG Bull,1998,82:110-146.
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