塔北—塔中地区三叠系层序地层及岩性油气藏特征
|
摘要
运用层序地层学原理,结合钻井、测井和地震资料分析,在塔北—塔中地区三叠系识别出5个层序界面,将三叠系划分为4个三级层序,在此基础上建立了塔北—塔中地区三叠系的层序地层格架,并对地层格架中的沉积充填特征进行了分析。认为三叠系属于内陆坳陷盆地在聚敛期沉积的一套地层,发育3类沉积体系,从盆地边缘向盆地内部依次为(扇)辫状河三角洲、滨浅湖、半深湖、深湖相。研究区发育4种储集砂体,单独或配合发育可形成砂体上倾尖灭、砂岩透镜体、(水下)分流河道等多种圈闭,是寻找三叠系岩性油气藏的理想目标区。
The drilling performance curve,well logs and seismic data are analyzed using sequence stratigraphy theory,and five sequence interfaces of Triassic in Tabei-Tazhong area,Tarim basin,which belong to Type-I sequence interfaces except SI-2 and SI-3 belonging to Type-II.Based on these interfaces,the Triassic can be divided into four Class-3 sequences,hence the sequence stratigraphic framework of the Triassic in this area is developed and its sedimentary characteristics are analyzed.It is suggested that the Triassic belongs to a set of strata deposited in convergent period in inland downwarping basin with three types of sedimentary systems characterized by varied facies distributions of braided fluvial delta,coastal lake,semi-deep lake,deep lake along the basinal margin toward the basinal interior.The composite analysis indicates that the studied area develops four types of reservoir sands,which could form multiple traps by separated or matching development,such as updip pinch-out,lenticular sand and underwater distributary channel.They are the ideal targets for lithologic reservoirs of the Triassic in this area.
The drilling performance curve,well logs and seismic data are analyzed using sequence stratigraphy theory,and five sequence interfaces of Triassic in Tabei-Tazhong area,Tarim basin,which belong to Type-I sequence interfaces except SI-2 and SI-3 belonging to Type-II.Based on these interfaces,the Triassic can be divided into four Class-3 sequences,hence the sequence stratigraphic framework of the Triassic in this area is developed and its sedimentary characteristics are analyzed.It is suggested that the Triassic belongs to a set of strata deposited in convergent period in inland downwarping basin with three types of sedimentary systems characterized by varied facies distributions of braided fluvial delta,coastal lake,semi-deep lake,deep lake along the basinal margin toward the basinal interior.The composite analysis indicates that the studied area develops four types of reservoir sands,which could form multiple traps by separated or matching development,such as updip pinch-out,lenticular sand and underwater distributary channel.They are the ideal targets for lithologic reservoirs of the Triassic in this area.
引文
[1]贾承造.塔里木盆地层序地层特征与非构造圈闭勘探[M].北京:石油工业出版社,2003:17-18.
[2]田景春,张翔,聂永生,等.层序的测井、地震响应特征研究[J].物探化探计算技术,2005,27(4):321-326.
[3]高志勇,郑荣才,罗平.陆相高分辨率层序地层中洪泛面特征研究[J].成都理工大学学报(自然科学版),2007,34(1):47-56.
[4]张文朝,韩春元.塔东北地区三叠系-侏罗系沉积相及找油前景[J].新疆石油地质,1999,20(3):229-234.
[5]田继军,姜在兴,李熙吉吉,等.川西前陆盆地上三叠统层序地层学研究[J].天然气工业,2008,28(2):30-33.
[6]徐汉林,江同文,顾乔元,等.新构造运动对塔里木盆地油气的控制作用[J].新疆石油地质,2009,30(2):175-178.
[7]刘辰生,郭建华,朱锐.塔里木盆地阿克库勒地区三叠系湖底扇初探[J].西南石油大学学报,2008,30(3):17-19.
[2]田景春,张翔,聂永生,等.层序的测井、地震响应特征研究[J].物探化探计算技术,2005,27(4):321-326.
[3]高志勇,郑荣才,罗平.陆相高分辨率层序地层中洪泛面特征研究[J].成都理工大学学报(自然科学版),2007,34(1):47-56.
[4]张文朝,韩春元.塔东北地区三叠系-侏罗系沉积相及找油前景[J].新疆石油地质,1999,20(3):229-234.
[5]田继军,姜在兴,李熙吉吉,等.川西前陆盆地上三叠统层序地层学研究[J].天然气工业,2008,28(2):30-33.
[6]徐汉林,江同文,顾乔元,等.新构造运动对塔里木盆地油气的控制作用[J].新疆石油地质,2009,30(2):175-178.
[7]刘辰生,郭建华,朱锐.塔里木盆地阿克库勒地区三叠系湖底扇初探[J].西南石油大学学报,2008,30(3):17-19.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心