塔中Ⅱ号断裂带构造特征及油气勘探前景
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摘要
根据二维地震资料解释成果,利用构造要素相关性分析及构造解析方法,探讨了塔中古隆起塔中Ⅱ号断裂带的构造特征,并分析了该断裂带的油气成藏条件。研究结果表明:塔中Ⅱ号断裂带在横向上具有分段性,不同区段的主逆冲断裂规模不同。塔中Ⅱ号断裂带演化受到晚寒武世之前张性断裂的控制,中寒武统膏盐岩在局部地区发生的较明显塑性流动和聚集增厚,影响了上覆地层的构造变形过程,主断裂于中奥陶世末—晚奥陶世发育。由于中寒武统膏云岩段分隔,寒武系发育盐上、盐下两套白云岩优质储层。在盐上斜坡区,受构造翘倾活动影响,可能会发育构造或岩性圈闭,因此盐上白云岩优质储层可成为良好的勘探目标。在塔中Ⅱ号断裂带普遍发育的古潜山圈闭中,其潜山围斜带可能是寻找大油气田的有利目标。
On the basis of 2D seismic data,the structural characteristics and reservoir-forming condition of No.Ⅱ fault zone in Tazhong area were investigated using the structural factor pertinence method and structural analysis.It is indicated that No.Ⅱ fault zone in Tazhong area can be divided into many sections.The main faults in the different sections have different deformation scale.Under the control of extensional faults formed before the Late Cambrian,the gypseous halite flowing and thickening activities appeared in the local area of the Middle Cambrian,which influenced the process of structural deformation in the upper stratum.The main fault of No.Ⅱ fault zone in the Tazhong area was developed from the Middle Ordovician to the Late Ordovician.Owing to the compact of gypseous halite in the Middle Cambrian,both over and under the gypseous halite developed two groups of high-quality dolomite reservoir.Under the influence of buckling activity,the structural or lithologic traps were developed at slope area over gypseous halite.So,the dolomite preferable reservoir over gypseous halite is a prospect exploration target.The periclinal belt around the buried mountain,which universally developed in No.Ⅱ fault zone of Tazhong area,has an advantageous prospect for large-scale oilfield.
On the basis of 2D seismic data,the structural characteristics and reservoir-forming condition of No.Ⅱ fault zone in Tazhong area were investigated using the structural factor pertinence method and structural analysis.It is indicated that No.Ⅱ fault zone in Tazhong area can be divided into many sections.The main faults in the different sections have different deformation scale.Under the control of extensional faults formed before the Late Cambrian,the gypseous halite flowing and thickening activities appeared in the local area of the Middle Cambrian,which influenced the process of structural deformation in the upper stratum.The main fault of No.Ⅱ fault zone in the Tazhong area was developed from the Middle Ordovician to the Late Ordovician.Owing to the compact of gypseous halite in the Middle Cambrian,both over and under the gypseous halite developed two groups of high-quality dolomite reservoir.Under the influence of buckling activity,the structural or lithologic traps were developed at slope area over gypseous halite.So,the dolomite preferable reservoir over gypseous halite is a prospect exploration target.The periclinal belt around the buried mountain,which universally developed in No.Ⅱ fault zone of Tazhong area,has an advantageous prospect for large-scale oilfield.
引文
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[12]张水昌,王飞宇,张保民,等.塔里木盆地中上奥陶统油源层地球化学研究[J].石油学报,2000,21(6):23-28.Zhang Shuichang,Wang Feiyu,Zhang Baomin,et al.Middle-Up-per Ordovician source rock geochemistry of the Tarim Basin[J].Acta Petrolei Sinica,2000,21(6):23-28.
[13]赵靖舟.塔里木盆地北部寒武—奥陶系海相烃源岩重新认识[J].沉积学报,2001,19(1):117-124.Zhao Jingzhou.Evoluation on the Cambrian-Ordovician marinesource rocks from the north Tarim Basin[J].Acta Sedimentolog-ica Sinica,2001,19(1):117-124.
[2]翟光明,王建君.对塔中地区油气条件的认识[J].石油学报,1999,20(4):1-5.Zhai Guangming,Wang Jianjun.Analysis of petroleum geology inTazhong region[J].Acta Petrolei Sinica,1999,20(4):1-5.
[3]邬光辉,李启明,张宝收,等.塔中Ⅰ号断裂坡折带构造特征及勘探领域[J].石油学报,2005,26(1):27-30.Wu Guanghui,Li Qiming,Zhang Baoshou,et al.Structural char-acteristics and exploration fields of No.1Faulted Slope Break inTazhong area[J].Acta Petrolei Sinica,2005,26(1):27-30.
[4]张宗命,贾承造.塔里木克拉通盆地内古隆起及其找油气方向[J].西安石油学院学报:自然科学版,1997,12(3):8-13.Zhang Zongming,Jia Chengzao.Palaeohighs in craton basin ofTalimu and the exploration objectives[J].Journal of Xi’an Pe-troleum Institute:Natural Science Edition,1997,12(3):8-13.
[5]张振生,李明杰,刘社平.塔中低凸起的形成和演化[J].石油勘探与开发,2002,29(1):28-31.Zhang Zhensheng,Li Mingjie,Liu Sheping.Generation and evo-lution of Tazhong low uplift[J].Petroleum Exploration and De-velopment,2002,29(1):28-31.
[6]李明杰,郑孟林,冯朝荣,等.塔中低凸起的结构特征及其演化[J].西安石油大学学报:自然科学版,2004,19(4):43-45.Li Mingjie,Zheng Menglin,Feng Chaorong,et al.Structural charac-teristics and evolution of Tazhong low uplift[J].Journal of Xi’anShiyou University:Natural Science Edition,2004,19(4):43-45.
[7]吕修祥,胡轩.塔里木盆地塔中低凸起油气聚集与分布[J].石油与天然气地质,1997,18(4):288-293.LüXiuxiang,Hu Xuan.Hydrocarbon accumulation and distribu-tion in Tazhong low uplift of Tarim Basin[J].Oil&Gas Geolo-gy,1997,18(4):288-293.
[8]杨海军,邬光辉,韩剑发,等.塔里木盆地中央隆起带奥陶系碳酸盐岩台缘带油气富集特征[J].石油学报,2007,28(4):26-30.Yang Haijun,Wu Guanghui,Han Jianfa,et al.Characteristics ofhydrocarbon enrichment along the Ordovician carbonate platformmargin in the central uplift of Tarim Basin[J].Acta Petrolei Sini-ca,2007,28(4):26-30.
[9]李明杰,胡少华,王庆果,等.塔中地区走滑断裂体系的发现及其地质意义[J].石油地球物理勘探,2006,41(1):116-121.Li Mingjie,Hu Shaohua,Wang Qingguo,et al.Discovery ofstrike-slip fault system in Tazhong area and geologic meaning[J].Oil Geophysical Prospecting,2006,41(1):116-121.
[10]赵宗举,周新源,郑兴平,等.塔里木盆地主力烃源岩的诸多证据[J].石油学报,2005,26(3):10-15.Zhao Zongju,Zhou Xinyuan,Zheng Xingping,et al.Evidences ofchief source rock in Tarim Basin[J].Acta Petrolei Sinica,2005,26(3):10-15.
[11]梁狄刚,张水昌,张宝民,等.从塔里木盆地看中国海相生油问题[J].地学前缘,2000,7(4):534-547.Liang Digang,Zhang Shuichang,Zhang Baomin,et al.Under-standing on marine oil generation in China based on Tarim Basin[J].Earth Science Frontiers,2000,7(4):534-547.
[12]张水昌,王飞宇,张保民,等.塔里木盆地中上奥陶统油源层地球化学研究[J].石油学报,2000,21(6):23-28.Zhang Shuichang,Wang Feiyu,Zhang Baomin,et al.Middle-Up-per Ordovician source rock geochemistry of the Tarim Basin[J].Acta Petrolei Sinica,2000,21(6):23-28.
[13]赵靖舟.塔里木盆地北部寒武—奥陶系海相烃源岩重新认识[J].沉积学报,2001,19(1):117-124.Zhao Jingzhou.Evoluation on the Cambrian-Ordovician marinesource rocks from the north Tarim Basin[J].Acta Sedimentolog-ica Sinica,2001,19(1):117-124.
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