塔河油田南部中奥陶统一间房组沉积相精细划分
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摘要
从地质、测井及地震等方面,阐明了一间房组层序关键界面识别与划分的标志,利用层序地层学方法对一间房组与上覆恰尔巴克组的地层分界进行了重新厘定,在三级层序框架内建立了一间房组上部的五级层序高精度地层格架,并结合钻井及地震资料恢复了三级层序沉积相。在此基础上,对一间房组上部Ⅱ—Ⅴ高频层序的滩体进行了精细刻划,分析了各个高频层序滩体演变规律。塔里木盆地在中奥陶世已由早奥陶世的一个台地分化成了2个台地。一间房组发育开阔台地相和台内礁滩相两种沉积相,礁滩体发育于台内坡折带内缘,为台内点礁和小型滩。
The signs for recognizing and dividing the key sequence interface in Yijianfang Formation were analyzed by using geology,log and seismic methods.The boundary between Yijianfang Formation and Qiaerbakezu Formation was newly conformed according to the sequence stratigraphy.The high-revolution sequence stratigraphy framework for fifth-order sequence in the upper Yijianfang Formation(the upper high system tract)was founded within the three-order sequence.The three-order sedimentary facies were resumed using well drilling and seismic data.The beach body distribution in Ⅱ-Ⅴ high frequency sequence in the upper Yijianfang Formation was finely depicted,and the beach body evolvement law in each high frequency sequence was analyzed.It shows that one platform was divided into two platforms from early Ordovician to the middle Ordovician in Tarim Basin.Two sedimentary facies including open platform,intraplatform reef and beach body facies were developed in Yijianfang Formation,and the reefs and beach body characterized by point reefs and beach body within the carbonate platform were distributed in the break of slope of the platform.
The signs for recognizing and dividing the key sequence interface in Yijianfang Formation were analyzed by using geology,log and seismic methods.The boundary between Yijianfang Formation and Qiaerbakezu Formation was newly conformed according to the sequence stratigraphy.The high-revolution sequence stratigraphy framework for fifth-order sequence in the upper Yijianfang Formation(the upper high system tract)was founded within the three-order sequence.The three-order sedimentary facies were resumed using well drilling and seismic data.The beach body distribution in Ⅱ-Ⅴ high frequency sequence in the upper Yijianfang Formation was finely depicted,and the beach body evolvement law in each high frequency sequence was analyzed.It shows that one platform was divided into two platforms from early Ordovician to the middle Ordovician in Tarim Basin.Two sedimentary facies including open platform,intraplatform reef and beach body facies were developed in Yijianfang Formation,and the reefs and beach body characterized by point reefs and beach body within the carbonate platform were distributed in the break of slope of the platform.
引文
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[12]Posamentier Henry W,Weimer Paul.Siliciclastic sequence stra-tigraphy and petroleum geology—where to from here?[J].AAPG Bulletin,1993,77(5):731-742.
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[2]林畅松,刘景彦,刘丽军,等.高精度层序地层分析:建立沉积相和储层规模的等时地层格架[J].现代地质,2002,16(3):276-281.Lin Changsong,Liu Jingyan,Liu Lijun,et al.High resolution se-quence stratigraphy analysis:Construction of chronostratigraphicsequence framework on facies and reservoir scale[J].Geoscience,2002,16(3):276-281.
[3]许效松,刘宝?,汪正江,等.中国中西部海相盆地分析及油气资源[M].北京:地质出版社,2004:48-58.Xu Xiaosong,Liu Baojun,Wang Zhengjiang,et al.Sea facies basinanalysis and oil resources in the middle-west China[M].Beijing:Geological Publishing House,2004:48-58.
[4]Van Wagoner J C,Mitchum H M,Campion K M,et al.Siliciclas-tic sequence stratigraphy in well logs,cores and out crops:Con-cepts for high-resolution correlation of time and facies[J].AAPGMethods in Exploration Series,1990,72(7):1-57.
[5]Mitchum R M,Van Wagoner J C.High frequency sequences andtheir stacking patterns:Sequence stratigraphic evidence of highfrequency eustatic cycles[J].Sedimentary Geology,1991,70(2):131-147.
[6]Vail P R,Audemard F,Bowman S A,et al.The stratigraphic sig-natures of tectonics,eustasy and sedimentology—an overview[C]∥Einsele G,Ricken W,Seilacher A.Cycles and events in stratig-raphy.Berlin Heidberg:Springer Verlag,1991:617-659.
[7]王鸿祯,史晓颖.沉积层序及海平面旋回的分类级别—旋回周期的成因讨论[J].现代地质,1998,12(1):1-16.Wang Hongzhen,Shi Xiaoying.Hierarchy of depositional se-quences and eustatic cycles—a discussion on the mechanism ofsedimentary cycles[J].Geoscience,1998,12(1):1-16.
[8]刘文,李永宏,张涛,等.塔河油田奥陶系碳酸盐岩沉积相及地层学研究[J].石油实验地质,2002,24(2):104-109.Liu Wen,Li Yonghong,Zhang Tao,et al.Study on the sedimen-tary facies and sequences stratigraphy of the Ordovician carbon-ate rock in Tahe Oilfield[J].Petroleum Geology&Experiment,2002,24(2):104-109.
[9]张抗.塔河油田似层状储集体的发现及勘探方向[J].石油学报,2003,24(5):4-9.Zhang Kang.Discovery and exploration of like-layered reservoirin Tahe Oilfield of Tarim Basin[J].Acta Petrolei Sinica,2003,24(5):4-9.
[10]林忠民.塔河油田奥陶系碳酸盐岩储层特征及成藏条件[J].石油学报,2002,23(3):23-26.Lin Zhongmin.Carbonate rock reservoir features and oil-gas ac-cumulating conditions in the Ordovician of Tahe Oilfield in north-ern Tarim Basin[J].Acta Petrolei Sinica,2002,23(3):23-26.
[11]翟晓先,俞仁连,何发岐,等.塔河地区奥陶系一间房组微裂隙颗粒灰岩储集体的发现与勘探意义[J].石油实验地质,2002,24(5):387-392.Zhai Xiaoxian,Yu Renlian,He Faqi,et al.Discovery and explora-tion significance of microfissure grain limestone reservoirs in theOrdovician Yijianfang Formation of Tahe area[J].Petroleum Ge-ology&Experiment,2002,24(5):387-392.
[12]Posamentier Henry W,Weimer Paul.Siliciclastic sequence stra-tigraphy and petroleum geology—where to from here?[J].AAPG Bulletin,1993,77(5):731-742.
[13]Cross T A,Baler M R,Chapin M A,et al.Application of highresolution sequence stratigraphy to reservoir analysis[C]∥Es-chard R,Doligez B.Subsurface reservoir characterization fromoutcrop observation.Paris:Editions Technip,1993:11-33.
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