钙质含量旋回在卡拉沙依组小层对比中的应用
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摘要
塔河油田卡拉沙依组河道相砂岩油层夹于卡三段和卡四段的泛滥平原泥岩中,小层对比时缺乏时间—岩性标志层。研究发现该地层中钙质含量变化似乎反映出与三级海平面变化有关的异旋回特点,因而具等时意义。根据钙质含量引起的电阻率和自然伽玛测井曲线变化和旋回特征将卡三段、四段自上而下分为5个小层。各小层厚度一般在80—100m之间,小层界线在连井地震剖面上均标定在同一个同相轴上,也反映了等时性。含油气砂岩较薄的单层厚度(2—5m)和河道微相类型决定了它们在横向上多为井间不连通的透镜状分布。
The Carboniferous Kalashayi Formation in the Tahe Oilfield occurs as lenticular channel facies of sandstones interbedded between the overbank mudstones of Members K3 and K4. Minilayer correlation is difficult due to lack of isochronous lithologic mark. Based on cycles of resistivity and Gamma ray logs that change with calcareous contents in mudstones, Members K3 and K4 are subdivided into five minilayers, Ⅰ,Ⅱ,Ⅲ, Ⅳ, andⅤ in descending order. Each minilayer, 80—100m thick, situated on the same event when calibrated on a well-linked seismic section, suggesting isochronism of such stratigraphic correlation. The small thickness(2-5m) and channel type of the sandstones reservoir suggest their laterally limited distribution and disconnection between wells.
The Carboniferous Kalashayi Formation in the Tahe Oilfield occurs as lenticular channel facies of sandstones interbedded between the overbank mudstones of Members K3 and K4. Minilayer correlation is difficult due to lack of isochronous lithologic mark. Based on cycles of resistivity and Gamma ray logs that change with calcareous contents in mudstones, Members K3 and K4 are subdivided into five minilayers, Ⅰ,Ⅱ,Ⅲ, Ⅳ, andⅤ in descending order. Each minilayer, 80—100m thick, situated on the same event when calibrated on a well-linked seismic section, suggesting isochronism of such stratigraphic correlation. The small thickness(2-5m) and channel type of the sandstones reservoir suggest their laterally limited distribution and disconnection between wells.
引文
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1蒲仁海,李艾红.2000.塔河1区石炭系储层预测研究报告.
朱怀诚,詹家帧.1996.塔里木盆地覆盖区泥盆—石炭系孢粉组合及生物地层.古生物学报,35(增刊):139-161.
朱怀诚,赵治信,刘静江.1999.塔里木盆地泥盆系-石炭系界线研究.地质论评,45(2):125-158.
杨国栋.1990.塔北地区下石炭统轮藻的发现及其意义.地质论评,36(3):269-278.
金玉,王向东,王 译.2005.国际地层表(2004).地层学杂志,29(2):97-98.
周志毅.2001.塔里木盆地各纪地层.北京:科学出版社.119-169.
周丽清,邵德艳,刘玉刚.1999.洪泛面、异旋回、自旋回及油藏范围内的小层对比.石油勘探与开发,26(6):75-77.
哈兰德WB,考斯克AV,户埃林PG.1987.袁相国,姬再良,刘 春译.地质年代表.北京:地质出版社.22-30.
贾承造,张师本,吴绍祖等.2004,塔里木盆地及周边地层(上册) 各纪地层总结.北京:科学出版社.190-247.
阎相宾,李永宏.2002.塔河油田石炭系砂层划分对比及横向预测.勘探地球物理进展,25(5):36-40.
蒲仁海.1996.论地震地层的等时特征.地层学杂志,20(1):40-44.
蔡土赐主编.1999.新疆维吾尔自治区岩石地层.武汉:中国地质大学出版社.1-256.
CrossTA.1993.Applicationofhigh-resolutionsequence stratigraphytoreservoiranalysis.In:Proceedingsofthe7th ExplorationandProductionResearchConference,Paris.Technip.11-33.
ReynoldsAD.1999.Dimensionsofparalicsandstonebodies.AAPGBullitine,83(3);211-229.
SpencerHW.1994.Seismicexpressionandgeologicalsignificance ofalacustrinedeltainNeogenedepositsofthewesternSnake Plain,Idaho.AAPGBullitine,78(1):102-121.
StreckerUwe,SteidtmannJR,&SmithsonSB.1999.Aconcep-tualtectonostrtigraphicmodelforseismicfaciesmigrationin fluvial-lacustrineextensionalbasin.AAPGBulletine,83(2):43-61.
VailPR,AndemardF,BowmanSA,etal.1991.The stratigraphicsignaturesoftectonicseustasyandsedimentology——Anoverview.EinseleGetal.ed.Cyclesandeventsin stratigraphy.Berlin:Springer-Verlog.617-659.
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