鄂尔多斯盆地大牛地气田下石盒子组高分辨率层序地层分析
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摘要
下石盒子组是鄂尔多斯盆地大牛地气田的主要产气层位,沉积分布特征复杂,常规的小层对比方法难以准确识别其地层层序。在对测井、钻井及地震资料的基准面旋回识别标志进行分析的基础上,运用高分辨率层序地层学原理,在下石盒子组识别出3个中期旋回(MSC3—MSC5)和15个短期旋回(SSC13—SSC27)。中期旋回和短期旋回均可分为对称和非对称两种类型,其中对称型均细分为3个亚类:上升半旋回大于下降半旋回型(C1)、下降半旋回大于上升半旋回型(C3)两种不完全对称型及两半旋回近于相等的近完全—完全对称型(C2)。建立了中、短期旋回等时地层格架,并在此基础上进行了砂体追踪对比与分布模式分析,提高了储集层预测的准确性。图7表1参18
The Lower Shihezi Formation is a main gas producing formation,which is so complex in deposition that it is difficult to identify its stratigraphic sequences using conventional sublayer correlation.Based on the analysis of datum cycle markers in logging,drilling and seismic data,3 moderately-long-term(MSC3-MSC5) and 15 short-term cycles(SSC13-SSC27) were identified in the formation using the concept of high resolution sequency stratigraphy.The moderately-long-term and short-term cycles can be subdivided into symmetric and asymmetric types.The former type can be subdivided into 3 subtypes,i.e.C1 with the uplifting semi-cycle more than the subsiding semicycle,C3 with the uplifting semi-cycle less than the subsiding semi-cycle,both of which are incomplete symmetric,and C2 with two equal semicycles.The isochronous stratigraphic framework was established for moderately-long-term and short-term cycles.Tracing and correlation of sand bodies were conducted,with the accuracy of reservoir prediction improved.
The Lower Shihezi Formation is a main gas producing formation,which is so complex in deposition that it is difficult to identify its stratigraphic sequences using conventional sublayer correlation.Based on the analysis of datum cycle markers in logging,drilling and seismic data,3 moderately-long-term(MSC3-MSC5) and 15 short-term cycles(SSC13-SSC27) were identified in the formation using the concept of high resolution sequency stratigraphy.The moderately-long-term and short-term cycles can be subdivided into symmetric and asymmetric types.The former type can be subdivided into 3 subtypes,i.e.C1 with the uplifting semi-cycle more than the subsiding semicycle,C3 with the uplifting semi-cycle less than the subsiding semi-cycle,both of which are incomplete symmetric,and C2 with two equal semicycles.The isochronous stratigraphic framework was established for moderately-long-term and short-term cycles.Tracing and correlation of sand bodies were conducted,with the accuracy of reservoir prediction improved.
引文
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[18]顾家裕,郭彬程,张兴阳.中国陆相盆地层序地层格架及模式[J].石油勘探与开发,2005,32(5):11-15.
[2]邓宏文,王洪亮,李小孟.高分辨率层序地层对比在河流相中的应用[J].石油与天然气地质,1997,18(2):90-95.
[3]Cross T A,Lessenger M A.Sediment volume partitioning:Rationale for stratigraphic model valuation and high resolutionstratigraphic correlation[A].London:NPF Special PublicationHouse,1998.
[4]邓宏文,王洪亮,祝永军,等.高分辨率层序地层学———原理及应用[M].北京:地质出版社,2002.
[5]蔡希源,张明学.陆相盆地层序地层学研究中几个问题的探讨[J].现代地质,1999,13(3):287-290.
[6]贾振远,蔡忠贤.层序与旋回[J].地球科学,1997,22(5):449-455.
[7]林畅松,张燕梅,刘景彦,等.高精度层序地层学和储集层预测[J].地学前缘,2000,7(3):111-117.
[8]池秋鄂,龚福华.层序地层学基础与应用[M].北京:石油工业出版社,2001.
[9]罗立民.河湖沉积体系三维高分辨率层序地层学[M].北京:地质出版社,1999.
[10]Schumm S A.River response to base level changes implicationsfor sequence stratigraphy[J].Journal of Geology,1993,101(3):279-294.
[11]Shanley K W.Perspective of continental sequence stratigraphy[J].AAPG Bulletin,1994,78(4):544-568.
[12]郑荣才,吴朝容,叶茂才.浅谈陆相盆地高分辨率层序地层研究[J].成都理工学院学报,2000,27(3):241-244.
[13]Chiocci F L.Very high-resolution seismics as a tool for sequencestratigraphy applied to outcrop scale-Examples from EasternTyrrhenian Margin Holocene or Pleistocene deposits[J].AAPGBulletin,1994,78(3):378-395.
[14]Brown L F,Fisher W L.Seismic stratigraphic interpretation ofdepositional systems-Examples from Brazilian Rift and Pull-ApartBasins[J].AAPG Bulletin,1977,26:213-248.
[15]Burns B A.Fluvial response in a sequence stratigraphic framework-Example from the Montserrat fan delta,Spain[J].Journal ofSedimentary Research,1997,67(2):311-3219.
[16]Arrken J,F.The application of high-resolution sequencestratigraphy to fluvial systems[J].Sedimentology,1995,42(1):3-30.
[17]郑荣才,彭军,吴朝容.陆相盆地基准面旋回的级次划分和研究意义[J].沉积学报,2001,19(2):654-662.
[18]顾家裕,郭彬程,张兴阳.中国陆相盆地层序地层格架及模式[J].石油勘探与开发,2005,32(5):11-15.
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