准噶尔盆地车排子地区新近系沙湾组层序地层格架分析
|
摘要
根据陆相地层层序在地震剖面和电测曲线上的识别标志、合成记录标志以及岩石类型组合特点等方面的特征,将车排子地区新近系沙湾组划分出1个二级层序和2个三级层序。其中,层序Ⅰ为辫状河三角洲层序,层序Ⅱ为湖泊层序。又可以根据各层序的特点,将其分为3个体系域:低水位体系域、湖侵体系域和高水位体系域。针对研究区目的层段层序发育的特点,在层序地层单元划分和对比的基础上,结合构造背景和地层厚度的变化,展示了该区层序东南部厚度较大,发育完整,厚度稳定;西北部由于遭受剥蚀,厚度较小,层序发育不完整的格架特征。初步分析了层序与含油气性的关系,预测了不同层序的勘探重点和目标,认为层序Ⅰ的低水位体系域和层序Ⅱ的湖侵体系域为寻找岩性油气藏的有利部位。
Based on the identification features of continental stratigraphic sequences on seismic profiles and wire-line logs,synthetic seismograms and the characteristics of lithologic combination,the Neogene Shawan formation is divided into one second-order sequence and two third-order sequences.The third-order sequence Ⅰ is braided as a delta front sequence,while the sequence Ⅱ is a lacustrine sequence.Each third-order sequence according to its characteristics can be divided into three system tracts:low stand,transgressive and high stand system tracts.Based on the identification and correlation of sequence stratigraphic unit,and according to the characteristics of the stratigraphic sequences,the tectonic evolution history and the variation of strata thickness,the sequence stratigraphy framework is shown to have a great,complete and stable thickness in the study area of south-east,and a thinner,incomplete one in the north-west.A preliminary analysis is made on the relationship between sequences and oil-gas exploration potentials,and exploration priorities and goals in each sequences are predicted.The favorable lithological reservoirs are found to be located mainly in the low stand system tracts of sequence Ⅰ and in the transgressive system tracts of sequence Ⅱ.
Based on the identification features of continental stratigraphic sequences on seismic profiles and wire-line logs,synthetic seismograms and the characteristics of lithologic combination,the Neogene Shawan formation is divided into one second-order sequence and two third-order sequences.The third-order sequence Ⅰ is braided as a delta front sequence,while the sequence Ⅱ is a lacustrine sequence.Each third-order sequence according to its characteristics can be divided into three system tracts:low stand,transgressive and high stand system tracts.Based on the identification and correlation of sequence stratigraphic unit,and according to the characteristics of the stratigraphic sequences,the tectonic evolution history and the variation of strata thickness,the sequence stratigraphy framework is shown to have a great,complete and stable thickness in the study area of south-east,and a thinner,incomplete one in the north-west.A preliminary analysis is made on the relationship between sequences and oil-gas exploration potentials,and exploration priorities and goals in each sequences are predicted.The favorable lithological reservoirs are found to be located mainly in the low stand system tracts of sequence Ⅰ and in the transgressive system tracts of sequence Ⅱ.
引文
[1]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.The sequence stratigraphy of terrestrial rift lacustrial basin[M].Beijing:Petroleum Industry Press,1996:17-29.
[2]纪友亮,张世奇.层序地层学原理及层序成因机制模式[M].北京:地质出版社,1998:108-156.Ji Youliang,Zhang Shiqi.Principles of sequence stratigraphy and sequence pattern formation mechanism[M].Beijing:Geological Press,1998:108-156.
[3]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.
[4]邓宏文.美国层序地层研究中的新学派——高分辨率层序地层学[J].石油与天然气地质,1995,16(2):89-97.Deng Hongwen.Oil and Gas Geology,1995,16(2):89-97.
[5]张世奇,纪友亮.陆相断陷湖盆层序地层学模式探讨[J].石油勘探与开发,1996,23(5):23-28.Ji Youliang,Zhang Shiqi.Petroleum Exploration and Development,1996,23(5):23-28.
[6]胡宗全.层序地层研究的新思路——构造-层序地层研究[J].现代地质,2004,18(4):549-554.Hu Zongquan.Modern Geology,2004,18(4):549-554.
[2]纪友亮,张世奇.层序地层学原理及层序成因机制模式[M].北京:地质出版社,1998:108-156.Ji Youliang,Zhang Shiqi.Principles of sequence stratigraphy and sequence pattern formation mechanism[M].Beijing:Geological Press,1998:108-156.
[3]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.
[4]邓宏文.美国层序地层研究中的新学派——高分辨率层序地层学[J].石油与天然气地质,1995,16(2):89-97.Deng Hongwen.Oil and Gas Geology,1995,16(2):89-97.
[5]张世奇,纪友亮.陆相断陷湖盆层序地层学模式探讨[J].石油勘探与开发,1996,23(5):23-28.Ji Youliang,Zhang Shiqi.Petroleum Exploration and Development,1996,23(5):23-28.
[6]胡宗全.层序地层研究的新思路——构造-层序地层研究[J].现代地质,2004,18(4):549-554.Hu Zongquan.Modern Geology,2004,18(4):549-554.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心