巴楚隆起寒武系层序格架及生储盖组合特征
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摘要
通过对野外露头剖面、钻(测)井、地震解释等相关资料的综合分析,以层序地层学理论为指导,将塔里木盆地巴楚隆起寒武系划分为3个二级层序,14个三级层序,其中二级层序均为I型层序,主要发育海侵体系域和高位体系域,在寒武纪,研究区主要表现为局限台地—蒸发台地的交替沉积,其水体深度西北缘相对较大,东南部相对较浅。在此基础上根据其体系域发育特征探讨了研究区生储盖发育特征及时空配置规律,共发育1套烃源岩、3套储集层、2套盖层,烃源岩为SS1海侵体系域,储层分别为SS1高位体系域、SS2海侵体系域、SS3高位体系域和海侵体系域,盖层分别为SS1高位体系域和SS2高位体系域,组成了两套较好的生储盖组合。研究区内野外剖面和钻井岩芯资料显示:白云岩多数经历过热液改造,在热液改造强烈的地方溶蚀孔洞较为发育,因此,在构造活动强烈的地区,热液通过断裂运移对原岩进行溶蚀和改造,易于形成较好的储层,进而形成较好的油气藏。
Based on comprehensive analysis of the outcrops,wells data,seismic explanation data,and guided with sequence stratigraphy theory,the sequence stratigraphy of Bachu Uplift Cambrian is divided into fourteen 3rdorder sequences and three 2nd-order sequences which belong to type I sequence and were constituted by TST and HST. In the Cambrian period,the sedimentary environment is mainly showed as alternating deposition of restricted platform-evaporation platform,the water depth is mainly showed as the northwestern margin is relatively deep and the southeast is shallow. On the basis of above,this paper discusses the characteristics of source-reservoir-cap rock and its rule of combination on the basis of sequences stratigraphic framework,the results show that there are 1 set of source rock,3 sets of reservoir and 2 sets of cap developed in the Cambrian in the study area. The source rock is SS1 HST,reservoirs are SS1 HST,SS2 TST,SS3 TST and HST,caps are SS1 HST,SS2 HST. They combined into 2 sets of good source-reservoir-cap rock assemblages. In addition,most dolomites in the outcrops or in the drill core have been changed by hydrothermal,and the greater intensity of hydrothermal alteration,the more developed dissolution pores. Therefore,in some of the places where intense tectonic activities happened,hydrothermal then began to change the rock by migration. At last,it formed good reservoirs.
Based on comprehensive analysis of the outcrops,wells data,seismic explanation data,and guided with sequence stratigraphy theory,the sequence stratigraphy of Bachu Uplift Cambrian is divided into fourteen 3rdorder sequences and three 2nd-order sequences which belong to type I sequence and were constituted by TST and HST. In the Cambrian period,the sedimentary environment is mainly showed as alternating deposition of restricted platform-evaporation platform,the water depth is mainly showed as the northwestern margin is relatively deep and the southeast is shallow. On the basis of above,this paper discusses the characteristics of source-reservoir-cap rock and its rule of combination on the basis of sequences stratigraphic framework,the results show that there are 1 set of source rock,3 sets of reservoir and 2 sets of cap developed in the Cambrian in the study area. The source rock is SS1 HST,reservoirs are SS1 HST,SS2 TST,SS3 TST and HST,caps are SS1 HST,SS2 HST. They combined into 2 sets of good source-reservoir-cap rock assemblages. In addition,most dolomites in the outcrops or in the drill core have been changed by hydrothermal,and the greater intensity of hydrothermal alteration,the more developed dissolution pores. Therefore,in some of the places where intense tectonic activities happened,hydrothermal then began to change the rock by migration. At last,it formed good reservoirs.
引文
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[2]郑和荣,吴茂炳,邬兴威,等.塔里木盆地下古生界白云岩储层油气勘探前景[J].石油学报,2007,28(2):1–8.
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[11]孙省利,陈践发,刘文汇,等.塔里木盆地下寒武统硅质岩地球化学特征及其形成环境[J].石油勘探与开发,2004,31(3):45–48.
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[15]高志前,樊太亮,焦志峰,等.塔里木盆地寒武—奥陶系碳酸盐岩台地样式及其沉积响应特征[J].沉积学报,2006,24(1):19–27.
[16]刘家铎,田景春,张翔,等.塔里木盆地寒武系层序界面特征及其油气地质意义[J].矿物岩石,2009,29(4):1–6.
[17]贾承造,张师本,吴绍祖等.塔里木盆地及周边地层[M].北京:科学出版社,2004.
[2]郑和荣,吴茂炳,邬兴威,等.塔里木盆地下古生界白云岩储层油气勘探前景[J].石油学报,2007,28(2):1–8.
[3]蔡习尧,毛树华,钱一雄,等.塔里木盆地巴楚隆起寒武系划分与对比[J].新疆石油地质,2009,30(1):38–42.
[4]邵龙义,何宏,彭苏萍,等.塔里木盆地巴楚隆起寒武系及奥陶系白云岩类型及形成机理[J].古地理学报,2002,4(2):19–30.
[5]祝贺,刘家铎,孟万斌,等.塔里木盆地巴楚隆起寒武系层序及岩相古地理[J].新疆石油地质,2010,3:1(4):344–348.
[6]于炳松.塔里木盆地北部寒武—奥陶纪层序地层格架[J].矿物学报,1996,16(3):298–303.
[7]于炳松,陈建强,林畅松.塔里木地台北部寒武纪—奥陶纪层序地层及其与扬子地台和华北地台的对比[J].中国科学:D辑,2001,31(1):17–26.
[8]于炳松,Dong H,Widom E,等.塔里木盆地北部下寒武统底部黑色页岩的Re-Os和Nd同位素特征及其与扬子地台的对比[J].中国科学:D辑,2004,34(增刊Ⅰ):83–88.
[9]罗俐,沈昭国.塔里木盆地寒武和奥陶系石油地质特征[J].西南石油学院学报,1995,17(2):49–54.
[10]何宏,彭苏萍,邵龙义,等.巴楚隆起与阿瓦提凹陷寒武系及奥陶系沉积古地理分析[J].煤田地质与勘探,2002,30(6):1–4.
[11]孙省利,陈践发,刘文汇,等.塔里木盆地下寒武统硅质岩地球化学特征及其形成环境[J].石油勘探与开发,2004,31(3):45–48.
[12]郑家凤,穆曙光.塔里木盆地震旦纪～奥陶纪岩相古地理[J].西南石油学院学报,1995,17(4):1–5.
[13]冯增昭,鲍志东,吴茂炳,等.塔里木地区寒武纪岩相古地理[J].古地理学报,2006,8(4):427–439.
[14]冯增昭,鲍志东,吴茂炳,等.塔里木地区寒武纪和奥陶纪岩相古地理[M].北京:地质出版社,2005.
[15]高志前,樊太亮,焦志峰,等.塔里木盆地寒武—奥陶系碳酸盐岩台地样式及其沉积响应特征[J].沉积学报,2006,24(1):19–27.
[16]刘家铎,田景春,张翔,等.塔里木盆地寒武系层序界面特征及其油气地质意义[J].矿物岩石,2009,29(4):1–6.
[17]贾承造,张师本,吴绍祖等.塔里木盆地及周边地层[M].北京:科学出版社,2004.
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