黔西上二叠统长兴组米兰科维奇旋回研究
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摘要
选择黔西地区盘1井、威宁1井、纳雍1井和织金1井,对长兴组自然伽马测井数据进行频谱分析,识别出其中的米兰科维奇周期,并采用滤波手段提取出其中的稳定周期,进行连井对比。结果表明频谱峰值与米兰科维奇周期存在良好的对应关系,研究区长兴组地层中保存着123. 0 ka的偏心率周期、45. 0 ka和35. 6 ka的斜率周期、21. 2 ka和17. 7 ka的岁差周期,各级周期的旋回厚度分别为4. 59～5. 73 m、1. 37～2. 15 m和0. 66～0. 98 m;各井的短偏心率旋回曲线显示研究区长兴组地层记录了约18个短偏心率旋回,据此估计出长兴组沉积时限约为2. 21 Ma;通过短偏心率旋回层和所计算沉积速率的连井对比,发现地层中海相标志岩层段等时性对比效果明显,反映了区域快速海侵的过程,而沉积速率的变化可能受到了海平面变化和物源供应的共同影响。
Spectral analysis was conducted on the natural gamma ray logging data from the Changxing Formation of the wells Pan 1,Weining 1,Nayong 1 and Zhijin 1 in western Guizhou. Major Milankovitch sedimentary cycles are identified,and the stable periods are extracted using the filtering method for the contrasts of well connection. The results show good correlations between spectral peaks and Milankovitch cycles,and it is suggested that the Changxing Formation in the study area has preserved the eccentricity cycle of 123 ka,the obliquity cycles of 45 ka and 35. 6 ka,and the precession cycles of 21. 2 ka and 17. 7 ka. The average stratigraphic thickness of all cycles is 4. 59 to 5. 73 m,1. 37 to 2. 15 m and 0. 66 to 0. 98 m,respectively. The short eccentricity cycle curve of each well shows that about 18 eccentricity cycles are recorded in the Changxing Formation,which indicate that the diagenesis of the Changxing Formation can be estimated as 2. 21 Ma. Based on the well connection contrasts of the short eccentricity cycle layers and the calculated sedimentation rate,it is found that the isochronic contrast effect of the marine facies marker sequence is distinct,which reflects rapid regional transgression,while the change of sedimentation rate may be affected by the sea-level change and the sedimentary supply.
Spectral analysis was conducted on the natural gamma ray logging data from the Changxing Formation of the wells Pan 1,Weining 1,Nayong 1 and Zhijin 1 in western Guizhou. Major Milankovitch sedimentary cycles are identified,and the stable periods are extracted using the filtering method for the contrasts of well connection. The results show good correlations between spectral peaks and Milankovitch cycles,and it is suggested that the Changxing Formation in the study area has preserved the eccentricity cycle of 123 ka,the obliquity cycles of 45 ka and 35. 6 ka,and the precession cycles of 21. 2 ka and 17. 7 ka. The average stratigraphic thickness of all cycles is 4. 59 to 5. 73 m,1. 37 to 2. 15 m and 0. 66 to 0. 98 m,respectively. The short eccentricity cycle curve of each well shows that about 18 eccentricity cycles are recorded in the Changxing Formation,which indicate that the diagenesis of the Changxing Formation can be estimated as 2. 21 Ma. Based on the well connection contrasts of the short eccentricity cycle layers and the calculated sedimentation rate,it is found that the isochronic contrast effect of the marine facies marker sequence is distinct,which reflects rapid regional transgression,while the change of sedimentation rate may be affected by the sea-level change and the sedimentary supply.
引文
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[21]刘杰,孙美静,苏朋,等.神狐海域水合物钻探区第四纪米氏旋回高频层序地层划分[J].海洋地质与第四纪地质,2016,36(2):11-18.
[22]吴怀春,张世红,黄清华.中国东北松辽盆地晚白垩世青山口组浮动天文年代标尺的建立[J].地学前缘,2008,15(4):159-169.
[23]刘洋,吴怀春,张世红,等.珠江口盆地珠一坳陷韩江组—万山组旋回地层学[J].地学科学——中国地质大学学报,2012,37(3):411-423.
[24]袁学旭.多煤层含气系统识别研究——以黔西上二叠统为例[D].徐州:中国矿业大学,2014.
[2]吴怀春,张世红,冯庆来,等.旋回地层学理论基础、研究进展和展望[J].地球科学——中国地质大学学报,2011,36(3):409-428.
[3]万晓樵,王成善,吴怀春,等.从地层到地时[J].地学前缘,2014,21(2):1-7.
[4]黄春菊.旋回地层学和天文年代学及其在中生代的研究现状[J].地学前缘,2014,21(2):48-66.
[5]汪浩.滇东、黔西晚二叠世煤的沉积学特征及古环境意义[D].北京:中国矿业大学(北京),2011.
[6]陈洪德,王成善,刘文钧,等.华南二叠纪层序地层与盆地演化[J].沉积学报,1999,17(4):529-535.
[7]王成善,李祥辉,陈洪德,等.中国南方二叠纪海平面变化及升降事件[J].沉积学报,1999,17(4):536-541.
[8]王鸿祯,史晓颖,王训练.中国层序地层研究[M].广东:广东科技出版社,2000:1-20.
[9]徐彬彬,何明德.贵州煤田地质[M].徐州:中国矿业大学出版社,2003:1-50.
[10]熊孟辉,秦勇,易同生.贵州晚二叠世含煤地层沉积格局及其构造控制[J].中国矿业大学学报,2006,35(6):778-782.
[11]赵伟,姜在兴,邱隆伟,等.小波分析划分层序单元的地质学理论基础、方法与应用[J].石油与天然气地质,2010,31(4):436-441.
[12]李凤杰,郑荣才,罗清林,等.四川盆地东北地区长兴组米兰科维奇周期分析[J].中国矿业大学学报,2007,36(6):805-810.
[13]金之钧,范国章,刘国臣.一种地层精细定年的新方法[J].地球科学——中国地质大学学报,1999,24(4):379-382.
[14]李保利,姚益民,张守鹏,等.山东东营凹陷沙河街组纹层年龄估算方法探讨[J].地层学杂志,2007,31(增刊):449-457.
[15]徐道一,张海峰,韩延本,等.陆相沉积的天文地层研究方法简介:以井下地层为例[J].地层学杂志,2007,31(增刊):431-442.
[16]姚益民,徐道一,张海峰,等.东营凹陷东辛224井上新世至全新世天文地层的研究[J].地层学杂志,2007,31(增刊):458-470.
[17]BERGER A,LOUTRE M F,LASKAR J. Stability of the astronomical frequencies over the earths history for paleoclimate studies[J]. Science,1992,255:560-566.
[18]BERGER A,LOUTRE M F,DEHANT V. Pre-Quaternary Milankovitch frequencies[J]. Nature,1989,342:133.
[19]SCHULZ M,MUDELSEE M. REDFIT:Estimating red-noise spectra directly from unevenly spaced paleoclimatic time series[J]. Computers&Geosciences,2002,28:421-426.
[20]吴淑玉,刘俊.北黄海东部坳陷始新统米兰科维奇旋回特征[J].地球科学——中国地质大学学报,2015,40(11):1933-1944.
[21]刘杰,孙美静,苏朋,等.神狐海域水合物钻探区第四纪米氏旋回高频层序地层划分[J].海洋地质与第四纪地质,2016,36(2):11-18.
[22]吴怀春,张世红,黄清华.中国东北松辽盆地晚白垩世青山口组浮动天文年代标尺的建立[J].地学前缘,2008,15(4):159-169.
[23]刘洋,吴怀春,张世红,等.珠江口盆地珠一坳陷韩江组—万山组旋回地层学[J].地学科学——中国地质大学学报,2012,37(3):411-423.
[24]袁学旭.多煤层含气系统识别研究——以黔西上二叠统为例[D].徐州:中国矿业大学,2014.