准噶尔盆地腹部侏罗系高分辨率层序地层特征
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摘要
针对准噶尔盆地腹部地区勘探程度低、砂体与油气分布具有较强隐蔽性的特点,将高分辨率层序地层学的原理和方法用于预测该区侏罗系储集砂体分布规律。根据钻井和地震标定结果,以不整合面和沉积作用转换面为界,将侏罗系划分为4个长期基准面旋回。短期基准面旋回主要有3种构成样式,形成了辫状河三角洲前缘水下分支河道、河口坝和滨浅湖席状砂3种沉积微相类型。根据短期旋回的叠加样式及关键界面对测井曲线的标定结果,建立了侏罗系中期基准面旋回的测井解释模型,将其划分为14个中期基准面旋回。受基准面和可容纳空间与沉积物供给量比值动态变化的控制,有利储集相带主要分布于中期基准面上升期,基准面下降期的砂体横向连通性好,不易形成岩性油藏。钻井证实SQ3层序的中下部是岩性油藏的主要发育段。
The prospecting degree is low,and the subtle reservoirs are very common in the central part of Junggar Basin.The principles and methods of high-resolution sequence stratigraphy were used to predict the distribution rules of the Jurassic reservoir.Based on drilling data and seismic calibration results,the Jurassic System was divided into four long-term base-level cycles bounded by unconformity and sedimentary transform surfaces.There are mainly three types of short-term base-level cycles,which control the formation of coastal-shallow lagoon sheet sand,mouch bar and subaqueous distributary channel sediments of braided stream delta front.According to stacking patterns of short-term cycles and calibration of logs restrained by key interfaces,a log interpretation model for the Jurassic medium-term base-level cycles was established,and 14 medium-term cycles were distinguished.Under the control of dynamic variation of the accommodation-sediment ratio,the favorable reservoirs were usually developed during the rising stage of the medium-term base levels.The sandstones deposited during descending stage are laterally interconnected,while the lithologic reservoirs can not be formed easily in this stage.The drilling data confirm that the mid-lower part of SQ3 sequence is the main interval for development of lithologic reservoirs.
The prospecting degree is low,and the subtle reservoirs are very common in the central part of Junggar Basin.The principles and methods of high-resolution sequence stratigraphy were used to predict the distribution rules of the Jurassic reservoir.Based on drilling data and seismic calibration results,the Jurassic System was divided into four long-term base-level cycles bounded by unconformity and sedimentary transform surfaces.There are mainly three types of short-term base-level cycles,which control the formation of coastal-shallow lagoon sheet sand,mouch bar and subaqueous distributary channel sediments of braided stream delta front.According to stacking patterns of short-term cycles and calibration of logs restrained by key interfaces,a log interpretation model for the Jurassic medium-term base-level cycles was established,and 14 medium-term cycles were distinguished.Under the control of dynamic variation of the accommodation-sediment ratio,the favorable reservoirs were usually developed during the rising stage of the medium-term base levels.The sandstones deposited during descending stage are laterally interconnected,while the lithologic reservoirs can not be formed easily in this stage.The drilling data confirm that the mid-lower part of SQ3 sequence is the main interval for development of lithologic reservoirs.
引文
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[2]鲍志东,管守锐,李儒峰,等,准噶尔盆地侏罗系层序地层学研究[J].石油勘探与开发,2002,29(4):48-51.
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[4]李振宏,汤良杰,丁文龙,等.准噶尔盆地腹部地区断裂特征分析[J].石油勘探与开发,2002,29(1):40-42.
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[9]高新生,赵霞飞,李天明,等.准噶尔盆地西部侏罗系层序地层特征[J].石油学报,2001,22(2):165-168.
[10]王居峰,邓宏文,蔡希源.准噶尔盆地中部侏罗系层序地层格架[J].石油勘探与开发,2005,32(1):23-26.
[11]王居峰,蔡希源,邓宏文.准噶尔盆地腹部下侏罗统三工河组沉积体系[J].新疆石油地质,2005,26(2):137-141.
[12]蔡希源,李思田.陆相盆地高精度层序地层学———隐蔽油气藏勘探基础、方法与实践[M].北京:地质出版社,2003:186-192.
[13]王居峰,蔡希源,邓宏文.东营凹陷中央洼陷带沙三段高分辨率层序地层与岩性圈闭特征[J].石油大学学报:自然科学版,2004,28(4):7-11.
[14]邓宏文,王红亮,李熙哲.层序地层地层基准面的识别、对比技术及应用[J].石油与天然气地质,1996,17(3):177-183.
[2]鲍志东,管守锐,李儒峰,等,准噶尔盆地侏罗系层序地层学研究[J].石油勘探与开发,2002,29(4):48-51.
[3]王宜林,王英民,齐雪峰,等,准噶尔盆地侏罗系层序地层划分[J].新疆石油地质,2001,22(5):382-385.
[4]李振宏,汤良杰,丁文龙,等.准噶尔盆地腹部地区断裂特征分析[J].石油勘探与开发,2002,29(1):40-42.
[5]王英民,刘豪,王媛.准噶尔盆地侏罗系非构造圈闭的勘探前景[J].石油勘探与开发,2002,29(1):44-46.
[6]杨永泰,王社教,培东宏,等.准噶尔盆地腹部深层成藏条件及勘探领域分析[J].石油勘探与开发,2002,29(4):32-34.
[7]张越迁,张年富,姚新玉.准噶尔盆地腹部油气勘探回顾与展望[J].新疆石油地质,2000,21(2):105-109.
[8]何登发,陈新发,张义杰,等.准噶尔盆地油气富集规律[J].石油学报,2004,25(3):1-10.
[9]高新生,赵霞飞,李天明,等.准噶尔盆地西部侏罗系层序地层特征[J].石油学报,2001,22(2):165-168.
[10]王居峰,邓宏文,蔡希源.准噶尔盆地中部侏罗系层序地层格架[J].石油勘探与开发,2005,32(1):23-26.
[11]王居峰,蔡希源,邓宏文.准噶尔盆地腹部下侏罗统三工河组沉积体系[J].新疆石油地质,2005,26(2):137-141.
[12]蔡希源,李思田.陆相盆地高精度层序地层学———隐蔽油气藏勘探基础、方法与实践[M].北京:地质出版社,2003:186-192.
[13]王居峰,蔡希源,邓宏文.东营凹陷中央洼陷带沙三段高分辨率层序地层与岩性圈闭特征[J].石油大学学报:自然科学版,2004,28(4):7-11.
[14]邓宏文,王红亮,李熙哲.层序地层地层基准面的识别、对比技术及应用[J].石油与天然气地质,1996,17(3):177-183.
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