塔河九连片地区三叠系下油组砂体分布及有利区带预测
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摘要
本文根据测、录井及三维地震资料,建立了塔河地区高精度层序地层格架,并重点对发育于TSQ3低位体系域中的下油组砂体类型及分布进行了系统研究。根据岩心观察结合粒度分析等手段,认为研究区下油组沉积砂体主要为辫状河三角洲前缘水下分流河道砂体,进一步划分为主分流河道复合微相、侧支分流河道复合微相和河道间微相3种类型。砂岩厚度、含砂率分布特征表明,砂体以东西向展布为特征,中部厚度最大,向南北砂岩厚度减小。依据研究区南高北低的区域构造背景,结合下油组沉积微相图与顶面构造图叠合表明,认为研究区南部AT4-S98井区以南为有利的岩性上倾尖灭区带。
The high-resolution sequence stratigraphic framework is constructed on the basis of well logs and 3D seismic data,with the emphasis on the types and distribution of the sandstones from the Triassic lower oil measures within the lowstand systems tract of TSQ3 in the Jiulianpian region along the Tarim River,Xinjiang.The sedimentary sandstones from the Triassic lower oil measures dominantly consist of braided delta front subaqueous distributary channel sandstones,which may be subdivided into three types: main distributary channel composite microfacies,secondary distributary channel composite microfacies and interdistributary channel microfacies.The examination of sandstone thickness and sand contents show that the sandstones display an EW-trending distribution,with larger thickness in the central part and smaller thickness northwards and southwards.The areas south of AT4-S98 zone in the southern part of the study area are believed to be the favourable zones in the Triassic lower oil measures in the study area.
The high-resolution sequence stratigraphic framework is constructed on the basis of well logs and 3D seismic data,with the emphasis on the types and distribution of the sandstones from the Triassic lower oil measures within the lowstand systems tract of TSQ3 in the Jiulianpian region along the Tarim River,Xinjiang.The sedimentary sandstones from the Triassic lower oil measures dominantly consist of braided delta front subaqueous distributary channel sandstones,which may be subdivided into three types: main distributary channel composite microfacies,secondary distributary channel composite microfacies and interdistributary channel microfacies.The examination of sandstone thickness and sand contents show that the sandstones display an EW-trending distribution,with larger thickness in the central part and smaller thickness northwards and southwards.The areas south of AT4-S98 zone in the southern part of the study area are believed to be the favourable zones in the Triassic lower oil measures in the study area.
引文
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[2]郭建华,刘辰生,朱锐.阿克库勒地区三叠系层序地层学及储集砂体成因类型[J].沉积学报,2007,25(2):169-176.
[3]李坤,赵锡奎,张小兵,等.塔里木盆地阿克库勒凸起油气输导体系类型与演化[J].地质科学,2007,42(4):766-778.
[4]蒲仁海,何发歧,袁丽珍,等.阿克库勒凸起南部辫状河三角洲砂体尖灭圈闭预测[J].石油与天然气地质,1999,20(3):224-227.
[5]张希明,刘青芳.塔北地区辫状三角洲沉积特征及油气勘探意义[J].石油勘探与开发,1999,26(1):21-24.
[6]姜在兴,沉积学[M].北京:石油工业出版社,2003.
[7]贾承造.中国塔里木盆地构造特征与油气[M].北京.石油工业出版社,1997,171-272.
[8]田作基.塔北前陆盆地与南天山造山带的耦合关系及油气分布特征[J].中国石油勘探,2006,20(4):17-20.
[9]崔军文,郭宪璞,丁孝忠,等.西昆仑-塔里木盆地盆、山结合带的中、新生代变形构造及其动力学[J].地学前缘,2006,13(4):104-108.
[10]吕海涛,陈红汉,唐大卿,等.塔河地区三叠系油气充注幕次划分与成藏时期确定[J].石油与天然气地质,2009,30(3):300-309.
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