四川盆地中二叠统层序地层学研究
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摘要
以钻井岩心资料为主,结合野外露头剖面和地震剖面资料,对四川盆地中二叠统层序界面及层序地层特征进行了研究,确立了该区层序界面识别标志,建立了四川盆地中二叠统层序地层格架,将该区中二叠统划分为5个三级层序(SQ1-SQ5),平均延时约4Ma。盆地在该时期为稳定的浅海相碳酸盐岩沉积,处于盆地的发育成熟阶段。各层序厚度呈逐步增加趋势,SQ4期沉积厚度最大。层序样式以TST>HST为主,体现盆地层序期内一个缓慢海进—快速海退的过程。从SQ4—HST期开始盆地上升接受剥蚀,至SQ5期剥蚀面积达最大,可延伸至盆地中部。
Through considerable drilling and logging data,com-bined with the outcrop section and so on,we carried on research on the sequence boundary of middle Permian in Sichuan basin and the characteristics of each sequence,estab-lished stratigraphic framework and divided into 5 third-or-der sequences(SQ1-SQ5),the average delay time is about 4 Ma.In this period Sichuan basin was a stable neritic facies carbonate deposition,and is in the mature stage of the basin.The thickness of each sequence was gradually increasing tendency and in the period of SQ4 the thickness of is maxi-mum.The sequence style is mainly of TST>HST,reflects the process of a slow transgression-rapid regression in this period.From the period of SQ4HST the basin began to rise and accept denudation,to the period of SQ5,the area of denudation was up to the maximum and could be extended to the center of basin.
Through considerable drilling and logging data,com-bined with the outcrop section and so on,we carried on research on the sequence boundary of middle Permian in Sichuan basin and the characteristics of each sequence,estab-lished stratigraphic framework and divided into 5 third-or-der sequences(SQ1-SQ5),the average delay time is about 4 Ma.In this period Sichuan basin was a stable neritic facies carbonate deposition,and is in the mature stage of the basin.The thickness of each sequence was gradually increasing tendency and in the period of SQ4 the thickness of is maxi-mum.The sequence style is mainly of TST>HST,reflects the process of a slow transgression-rapid regression in this period.From the period of SQ4HST the basin began to rise and accept denudation,to the period of SQ5,the area of denudation was up to the maximum and could be extended to the center of basin.
引文
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[3]林良彪,朱利东,朱莉娟.重庆万盛中二叠碳酸盐岩微相研究[J].沉积与特提斯地质,2004,24(1):61-68
[4]赵俊兴,李凤杰,刘娟,等.四川盆地东北部二叠系沉积相及其演化分析[J].天然气地球科学,2008,19(4):444-451
[5]李凤杰,陈荣林.四川盆地东北地区中-下二叠统层序地层特征研究[J].石油实验地质,2008,30(5):472-477
[6]冯增昭,何幼斌,吴胜和.中下扬子地区二叠纪岩相古地理[J].沉积学报,1993,11(3):12-24
[7]魏魁生,徐怀大,叶淑芬.四川盆地层序地层特征[J].石油与天然气地质,1997,18(2):151-157
[8]马永生,陈洪德,王国力,等.中国南方层序地层与古地理[M].北京:科学出版社,2009:115-160
[9]王成善,陈洪德,寿建峰,等.中国南方层序海相二叠系层序地层与油气勘探[M].四川成都:四川科学出版社,1998:70-90
[10]高雁,陈洪德,王成善,等.中扬子地区中二叠统层序地层研究[J].地层学杂志,2005,29(3):270-274
[11]何斌,王雅玫,姜晓玮.上扬子西部茅口组灰岩顶部古喀斯地貌的厘定及地质意义[J].中国地质,2004,31(1):46-50
[12]四川省地质矿产局.四川省区域地质志[M].北京:地质出版社,1991:182-206,649-662
[13]李国辉,李翔,宋蜀筠,等.四川盆地二叠系三分及其意义[J].天然气勘探与开发,2009,28(3):20-25
[14]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
[15]陈洪德,王成善,刘文均,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
[16]冯增昭,杨玉卿,金振奎,等.中国南方二叠纪岩相古地理[M].山东东营:石油大学出版社,1997:159-163
[17]陈宗清.四川盆地中二叠统茅口组天然气勘探[J].中国石油勘探,2007,(5):1-11
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