普光气田长兴组层序地层划分
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摘要
运用层序地层学原理,综合利用露头、岩心、钻井和地震资料,对普光气田上二叠统长兴组剖面层序地层进行研究,识别出2种类型3个层序界面,将长兴组划分出2个三级层序和5个四级层序,其中CSQ1为Ⅱ型层序,CSQ2为Ⅰ型层序,并在层序划分的基础上建立长兴组层序地层格架。CSQ1和CSQ2均由海侵体系域和高水位体系域组成,Ⅰ型层序界面平整,上下呈不整合接触,普遍存在暴露剥蚀,Ⅱ型层序界面CSQ1顶界面为短暂暴露不整合接触,CSQ1底界面在成因上为水下间断不整合接触,在剖面上为整合接触。
In Puguang gasfield,the stratigraphic sequence of Upper Permian Changxing Formation is studied based on sequence stratigraphy,and some outcrop,core,drilling and seismic data.This formation can be divided into two third-order sequences and five forth-order sequences,in which CSQ1 is type II sequence and CSQ2 is type I sequence.Meanwhile,its sequence framework is also established based on sequence classification.Result shows that(1) both CSQ1 and CSQ2 sequences are composed of transgressive system tract(TST) and high system tract(HST);(2) for type I,the sequence boundaries are smooth and there are unconformable contacts,and exposure erosion may be often found ;and(3) for type II,the top boundary of CSQ1 is exposed in a short time and there is an unconformable contact whereas the bottom boundary of CSQ1 is a underwater discontinuous unconformable contact in genesis but is conformable contact on the section.
In Puguang gasfield,the stratigraphic sequence of Upper Permian Changxing Formation is studied based on sequence stratigraphy,and some outcrop,core,drilling and seismic data.This formation can be divided into two third-order sequences and five forth-order sequences,in which CSQ1 is type II sequence and CSQ2 is type I sequence.Meanwhile,its sequence framework is also established based on sequence classification.Result shows that(1) both CSQ1 and CSQ2 sequences are composed of transgressive system tract(TST) and high system tract(HST);(2) for type I,the sequence boundaries are smooth and there are unconformable contacts,and exposure erosion may be often found ;and(3) for type II,the top boundary of CSQ1 is exposed in a short time and there is an unconformable contact whereas the bottom boundary of CSQ1 is a underwater discontinuous unconformable contact in genesis but is conformable contact on the section.
引文
[1]许效松,刘宝,赵玉光.上扬子台地西缘二叠系—三叠系层序界面成因分析与盆山转换[J].特提斯地质,1996,20(1):1-21.
[2]王成善,陈洪德,寿建峰,等.中国南方二叠纪层序地层划分与对比[J].沉积学报,1999,17(4):499-509.
[3]田景春,陈洪德,彭军,等.滇黔桂地区下、中三叠统层序划分、对比及层序地层格架[J].沉积学报,2000,18(2):198-204.
[4]何莹,黎平,杨宇,等.通南巴地区上二叠统—下三叠统层序地层划分[J].天然气工业,2007,27(6):21-27.
[5]毛立华,钟建华,李卫兵,等.普光气田层序地层格架与储层发育特征[J].断块油气田,2010,17(3):312-315.
[6]徐中波,尹太举,谷江锐,等.普光气田层序界面识别及层序划分[J].石油天然气学报,2008,30(1):198-201.
[7]马永生,牟传龙,郭彤楼,等.四川盆地东北部长兴组层序地层与储层分布[J].地学前缘,2005,12(3):179-185.
[8]李凤杰,刘殿鹤,郑荣才,等.四川盆地东北地区上二叠统层序地层特征研究[J].沉积学报,2009,27(6):1116-1123.
[9]荀宗海,石和.彭县小渔洞地区飞仙关组岩石地层和古生物特征[J].成都理工学院学报,1994,21(3):56-62.
[10]董霞,郑荣才,罗爱军,等.开江—梁平台内海槽东段长兴组层序—岩相古地理特征[J].沉积学报,2009,27(6):124-130.
[2]王成善,陈洪德,寿建峰,等.中国南方二叠纪层序地层划分与对比[J].沉积学报,1999,17(4):499-509.
[3]田景春,陈洪德,彭军,等.滇黔桂地区下、中三叠统层序划分、对比及层序地层格架[J].沉积学报,2000,18(2):198-204.
[4]何莹,黎平,杨宇,等.通南巴地区上二叠统—下三叠统层序地层划分[J].天然气工业,2007,27(6):21-27.
[5]毛立华,钟建华,李卫兵,等.普光气田层序地层格架与储层发育特征[J].断块油气田,2010,17(3):312-315.
[6]徐中波,尹太举,谷江锐,等.普光气田层序界面识别及层序划分[J].石油天然气学报,2008,30(1):198-201.
[7]马永生,牟传龙,郭彤楼,等.四川盆地东北部长兴组层序地层与储层分布[J].地学前缘,2005,12(3):179-185.
[8]李凤杰,刘殿鹤,郑荣才,等.四川盆地东北地区上二叠统层序地层特征研究[J].沉积学报,2009,27(6):1116-1123.
[9]荀宗海,石和.彭县小渔洞地区飞仙关组岩石地层和古生物特征[J].成都理工学院学报,1994,21(3):56-62.
[10]董霞,郑荣才,罗爱军,等.开江—梁平台内海槽东段长兴组层序—岩相古地理特征[J].沉积学报,2009,27(6):124-130.
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