准噶尔盆地车排子地区古近系层序地层与岩性圈闭预测
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摘要
为了探究车排子地区古近系层序地层发育规律和地层展布特征,应用经典层序地层学的原理和方法,通过对地震、钻井、测井和露头资料的综合分析,进行井间对比及井-震结合对比,详细研究了古近系层序的划分及特征。在车排子地区古近系识别出2个三级层序、4个体系域。研究区构造为一大型斜坡,可见小型坡折带,坡折带之下低位体系域发育,低位体系域与水进体系域由首次湖泛面分开,高位体系域不发育或不被识别。低位体系域以发育扇三角洲水下分流河道为特征,而水进体系域以滨浅湖相泥岩和粉砂岩沉积为主。地层发育受物源、古地形、气候和湖平面升降的控制,在研究区首次建立了古近系层序地层格架,并在层序地层格架内对研究区进行有利区带的预测,对车排子地区古近系地层寻找以岩性圈闭为主的非构造油气藏将起重要指导作用。
To study the palaeogene growth and development,and distribution characteristics of sequence stratigraphic bed in Chepaizi area,the sequence stratigraphy is used with a discussion of its principle,method and technology.Based on composite analyses of seismic,drilling,well logging and outcrop data,together with interwell and log-seismic correlations,the palaeogene sequence stratigraphic classification and features are obtained with two third-scale sequences and four system tracts identified.It is shown that the structure of this area assumes a large-scale slope with a small distinct slope break,with the development of a tract of Lowstand systems under the slope break.The tract of Lowstand systems and that of Transgressive systems are divided by first flooding surface.The tract of Highstand systems is undergrown or not identified.From the tract of Lowstand systems develop diffluent rivers of fan delta and barfacies of beach.From the tract of Transgressive systems develop mudstone and siltstone in beach barfacies.Stratigraphic development is controlled by sediment sources,relic landform,climatic conditions and lake level changes.The sequence stratigraphic framework of palaeogene in Chepaizi area is established.Under the sequence stratigraphic framework,favorable sectors of oil and gas bearing are predicted in studied area,which would play an important role in the search of lithologic subtle reservoirs in northwestern margin of Jungger Basin.
To study the palaeogene growth and development,and distribution characteristics of sequence stratigraphic bed in Chepaizi area,the sequence stratigraphy is used with a discussion of its principle,method and technology.Based on composite analyses of seismic,drilling,well logging and outcrop data,together with interwell and log-seismic correlations,the palaeogene sequence stratigraphic classification and features are obtained with two third-scale sequences and four system tracts identified.It is shown that the structure of this area assumes a large-scale slope with a small distinct slope break,with the development of a tract of Lowstand systems under the slope break.The tract of Lowstand systems and that of Transgressive systems are divided by first flooding surface.The tract of Highstand systems is undergrown or not identified.From the tract of Lowstand systems develop diffluent rivers of fan delta and barfacies of beach.From the tract of Transgressive systems develop mudstone and siltstone in beach barfacies.Stratigraphic development is controlled by sediment sources,relic landform,climatic conditions and lake level changes.The sequence stratigraphic framework of palaeogene in Chepaizi area is established.Under the sequence stratigraphic framework,favorable sectors of oil and gas bearing are predicted in studied area,which would play an important role in the search of lithologic subtle reservoirs in northwestern margin of Jungger Basin.
引文
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[3]陈轩,张尚峰,张昌民,等.准噶尔盆地车排子地区新近系沙湾组层序地层[J].新疆石油地质,2008,29(1):65-67.Chen Xuan,Zhang Shangfeng,Zhang Changmin,et al.XinjiangPetroleum Geology,2008,29(1):65-67.
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[5]纪友亮,张世奇.陆相断陷湖盆层序地层学[M].北京:石油工业出版社,1996:17-29.Ji Youliang,Zhang Shiqi.Principles of sequence stratigraphy andsequence pattern formation mechanism[M].Beijing:Petroleum IndustryPress,1996:17-29.
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[7]朱筱敏,康安,王贵文.陆相坳陷型和断陷型湖盆层序地层样式探讨[J].沉积学报,2003,21(2):283-287.Zhu Xiaomin,Kang An,Wang Guiwen.Acta Sedimentologica Sinica,2003,21(2):283-287.
[8]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.Gu Jiayu,Guo Bincheng,Zhang Xingyang.Petroleum Exploration andDevelopment,2005,32(5):11-15.
[9]顾家裕.陆相湖盆层序地层学模式[J].石油勘探与开发,1995,22(4):12-17.Gu Jiayu.Petroleum Exploration and Development,1995,22(4):12-17.
[10]Vail P R.Seismic stratigraphy interpretation using sequencestratigraphy[J].AAPG Bulletin,1987,27:1-10.
[11]邢凤存,陆永潮,刘传虎,等.车排子地区构造-古地貌特征及其控砂机制[J].石油与天然气地质,2008,29(1):78-83.Xing Fengcun,Lu Yongchao,Liu Chuanhu,et al.Oil&Gas Geology,2008,29(1):78-83.
[12]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(4):2-9.He Dengfa,Chen Xinfa,Zhang Yijie,et al.Acta Petrolei Sinica,2004,25(4):2-9.
[13]张国俊,王仲侯,吴虻,等.中国石油地质志:第15卷[M].北京:石油工业出版社,1993:57-88.Zhang Guojun,Wang Zhonghou,Wu Meng,et al.Petroleum geology ofChina:Vol 15[M].Beijing:Petroleum Industry Press,1993:57-88.
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