柴达木盆地西部古近系与新近系的地震相
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摘要
根据地震反射终止关系,结合柴达木盆地第三纪的地质背景,可以将该盆地古近系与新近系划分为7个三级层序。从内部反射结构和外部几何形态出发,再辅之以振幅、连续性等参数,在研究区的古近系与新近系地震反射剖面上可以识别出7种地震相,分别是平行席状地震相、亚平行波状地震相、前积地震相、充填地震相、丘状地震相、透镜状地震相和发散地震相。地震相的分布和演化受沉积体系演化的控制,在测井和钻井资料约束下的地震相解释能够重现柴达木盆地西部地区沉积体系的演化。
Paleogene-Neogene in the Qaidam basin can be divided into 7 level Ⅲ sequences based on the seismic reflections terminal relations and geological background in Tertiary Period. According to internal reflection texture and external geometric configuration, there are 7 seismic facies identified, with the help of amplitude and continuity, on the Paleogene-Neogene seismic reflection profile of studying area including parallel sheet seismic facies, sub-parallel wave seismic facies, progradational reflection facies, filling facies, hummocky facies, lens seismic facies and wedged facies. The distribution and evolution of seismic facies are controlled by evolution of depositional system and the seismic facies interpretation bounded by logging and drilling data can show the evolution of ancient depositional system in the western Qaidam basin again.
Paleogene-Neogene in the Qaidam basin can be divided into 7 level Ⅲ sequences based on the seismic reflections terminal relations and geological background in Tertiary Period. According to internal reflection texture and external geometric configuration, there are 7 seismic facies identified, with the help of amplitude and continuity, on the Paleogene-Neogene seismic reflection profile of studying area including parallel sheet seismic facies, sub-parallel wave seismic facies, progradational reflection facies, filling facies, hummocky facies, lens seismic facies and wedged facies. The distribution and evolution of seismic facies are controlled by evolution of depositional system and the seismic facies interpretation bounded by logging and drilling data can show the evolution of ancient depositional system in the western Qaidam basin again.
引文
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[8]侯安平,王旭红,朱文军.柴达木盆地马海平顶山区断裂活动与油气运聚[J].石油物探,2007,46(6):643-648.
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[2]徐怀大,王世飞,陈开远.地震地层学解释基础[M].武汉:中国地质大学出版社,1990.
[3]朱筱敏.层序地层学[M].东营:石油大学出版社,2000.
[4]孙家振,李兰斌.地震地质综合解释教程[M].武汉:中国地质大学出版社,2002.
[5]殷虹,郑杰青.南宁盆地北湖凹陷地震相、沉积相初探[J].天然气工业,2000,20(5):95-96.
[6]LAMBIAS J J.A model of tectonic control of lacustrine stratigraphic sequences in continental rift basins[J].AAPG Memoir,1991,50:137-149.
[7]刘桂侠,杨永泰.柴达木盆地北部基底岩性对上部地层构造演化及储集条件的影响[J].天然气工业,2003,23(2):40-42.
[8]侯安平,王旭红,朱文军.柴达木盆地马海平顶山区断裂活动与油气运聚[J].石油物探,2007,46(6):643-648.
[9]罗群,庞雄奇.柴达木盆地断裂特征与油气区带成藏规律[J].西南石油学院学报,2003,25(1):1-5.
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