琼东南盆地新生代沉降特征
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摘要
利用回剥技术对琼东南盆地进行了沉降史计算和分析,主要包括北部坳陷带的崖北凹陷、崖南凹陷,中央坳陷带的乐东凹陷,和南部坳陷带的华光凹陷。按照地震测线的分布和凹陷特征,我们共选取了30口模拟井进行一维沉降史计算,并展示了具有代表性的8口井,分析他们在不同时期的构造沉降速率与总沉降速率。分析结果表明,新生代以来,琼东南盆地主要经历了三个主要的沉降幕:(1)始新世至渐新世,盆地处于裂陷期,构造沉降速率较大,平均为81m.Ma-1,沉降中心位于中央坳陷带。(2)早中新至中中新世,盆地由裂陷期向坳陷期转化,平均构造沉降速率减小至68m.Ma-1;(3)晚中新世以后,盆地进入新一期的沉降阶段,平均构造沉降速率增加至84m.Ma-1;上新世以后,中央坳陷带发生快速沉降,达到了110m.Ma-1。
Tectonic subsidence histories of the Yabei,Yanan,Ledong and Huaguang sags in the Qiongdongnan Basin were analyzed by back-stripping technique.One-dimensional tectonic subsidence histories of 30 presumed wells were calculated,8 wells of which were appraised for their tectonic and total subsidence rates.The results show that the Qiongdongnan Basin experienced 3 main subsiding stages in Cenozoic.(1) The first stage was a rifting stage during Eocene and early Oligocene.The average tectonic subsidence rate was 81m·Ma-1 and it decreased from the central depression to the southern depression.The subsidence center was located at the central depression,which was supposed to be controlled by the pre-existing basal fault.The average tectonic subsidence rate was 105m·Ma-1 at the Ledong depression,74m·Ma-1 in the southern depression zone and 59m·Ma-1 at the Yabei depression.(2) In the second stage from early Miocene to middle Miocene,the Qiongdongnan Basin ended rifting and shifted to a depression stage.The average tectonic subsidence rate decreased to 68m·Ma-1.(3) Since middle Miocene,the Qiongdongnan Basin had experienced an accelerated subsidence stage.The average tectonic subsidence rate increased to 84m·Ma-1 in all the presumed wells.It was 90m·Ma-1 in the 5 presumed wells in the connection zone with the Yinggehai Basin,and 73m·Ma-1 in the 3 presumed wells in the northern part of the basin.After Pliocene,the subsidence rate was higher in the northern and central depression zones,with a value of 110m·Ma-1.
Tectonic subsidence histories of the Yabei,Yanan,Ledong and Huaguang sags in the Qiongdongnan Basin were analyzed by back-stripping technique.One-dimensional tectonic subsidence histories of 30 presumed wells were calculated,8 wells of which were appraised for their tectonic and total subsidence rates.The results show that the Qiongdongnan Basin experienced 3 main subsiding stages in Cenozoic.(1) The first stage was a rifting stage during Eocene and early Oligocene.The average tectonic subsidence rate was 81m·Ma-1 and it decreased from the central depression to the southern depression.The subsidence center was located at the central depression,which was supposed to be controlled by the pre-existing basal fault.The average tectonic subsidence rate was 105m·Ma-1 at the Ledong depression,74m·Ma-1 in the southern depression zone and 59m·Ma-1 at the Yabei depression.(2) In the second stage from early Miocene to middle Miocene,the Qiongdongnan Basin ended rifting and shifted to a depression stage.The average tectonic subsidence rate decreased to 68m·Ma-1.(3) Since middle Miocene,the Qiongdongnan Basin had experienced an accelerated subsidence stage.The average tectonic subsidence rate increased to 84m·Ma-1 in all the presumed wells.It was 90m·Ma-1 in the 5 presumed wells in the connection zone with the Yinggehai Basin,and 73m·Ma-1 in the 3 presumed wells in the northern part of the basin.After Pliocene,the subsidence rate was higher in the northern and central depression zones,with a value of 110m·Ma-1.
引文
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[14]谢文彦,张一伟,孙珍,等.琼东南盆地新生代发育机制的模拟研究[J].地学前缘,2008,15(2):232—242
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[16]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
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[18]邱燕,彭学超,李文成,等.琼东南盆地陆坡区地质-地球物理特征分析[J].南海地质研究,2004:55—66
[19]张云帆,孙珍,周蒂,等.南海北部陆缘新生代地壳减薄特征及其动力学意义[J].中国科学(D辑),2007,37(12):1—8
[20]CLIFT P D,SUN ZHEN.The sedimentary and tectonic e-volution of the Yinggehai?Song Hong basin and the south-ern Hainan margin,South China Sea:Implications for Ti-betan uplift and monsoon intensification[J].Geophys Res,2006,111:1—28
[21]ZHANG,PEI-ZHEN,MOLNAR P,W R.DOWNS,In-creased sedimentation rates and grain sizes 2-4 Myr agodue to the influence of climate change on erosion rates[J].Nature,2001,410,891—897.
[22]孙珍,钟志洪,周蒂,等.莺歌海盆地构造演化与强烈沉降机制的分析和模拟[J].地球科学,2007,32(3):347—357
[23]谢文彦,琼东南盆地断裂构造与成因机制[J].海洋地质与第四纪地质,2007,27(1):71—79
[2]ALLEN P A,ALLEN J R.Basin analysis principles andapplication[M].London:Blackwell Scientific Press,1990.
[3]钟志洪,王良书,李绪宣,等.琼东南盆地古近纪沉积充填演化及其区域构造意义[J].海洋地质与第四纪地质,2004,24(1):29—36.
[4]王根发,吴冲龙,周江羽,等.琼东南盆地第三系层序地层分析[J].石油实验地质,1998,20(2):124—128.
[5]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,2001,26(1):59—66.
[6]孙珍,钟志洪,周蒂,等.红河断裂带的新生代变形机制及莺歌海盆地的试验证据[J].热带海洋学报,2003,22(2):1—9.
[7]李绪宣,朱光辉.琼东南盆地断裂系统及其油气输导特征[J].中国海上油气,2005,17(1):1—7.
[8]赵忠新,王华,陆永潮.断坡带对沉积体系的控制作用—以琼东南盆地为例[J].石油勘探与开发,2003,30(1):25—27
[9]林畅松,张艳梅,盆地沉降史模拟分析[M]//龚再升,李思田.南海北部大陆边缘盆地分析与油气聚集.北京:科学出版社,1997:75—86
[10]陈红汉,孙永传,叶加仁.莺一琼盆地的独特埋藏史[J].中国海上油气(地质),1994,8(5):329—338
[11]张启明,莺—琼盆地的演化与构造-热体制[J].天然气工业1999,19(1):12—17
[12]郭令智,钟志洪,王良书.莺歌海盆地周边区域构造演化[J].高校地质学报,2001,7(1):1—12
[13]刘建章,王存武.莺一琼盆地热流体及油气地质意义[J].天然气勘探与开发,2004,27(1):12—17
[14]谢文彦,张一伟,孙珍,等.琼东南盆地新生代发育机制的模拟研究[J].地学前缘,2008,15(2):232—242
[15]孙珍,周蒂,钟志洪,等.莺一琼盆地基底控制断裂样式的模拟探讨[J].热带海洋学报,2005,24(2):70—79
[16]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
[17]垄再升,李思田,等.南海北部大陆边缘盆地分析与油气的聚集[M].1997,北京,科学出版社,1997
[18]邱燕,彭学超,李文成,等.琼东南盆地陆坡区地质-地球物理特征分析[J].南海地质研究,2004:55—66
[19]张云帆,孙珍,周蒂,等.南海北部陆缘新生代地壳减薄特征及其动力学意义[J].中国科学(D辑),2007,37(12):1—8
[20]CLIFT P D,SUN ZHEN.The sedimentary and tectonic e-volution of the Yinggehai?Song Hong basin and the south-ern Hainan margin,South China Sea:Implications for Ti-betan uplift and monsoon intensification[J].Geophys Res,2006,111:1—28
[21]ZHANG,PEI-ZHEN,MOLNAR P,W R.DOWNS,In-creased sedimentation rates and grain sizes 2-4 Myr agodue to the influence of climate change on erosion rates[J].Nature,2001,410,891—897.
[22]孙珍,钟志洪,周蒂,等.莺歌海盆地构造演化与强烈沉降机制的分析和模拟[J].地球科学,2007,32(3):347—357
[23]谢文彦,琼东南盆地断裂构造与成因机制[J].海洋地质与第四纪地质,2007,27(1):71—79
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