四十里城八道湾组层序格架和沉积相研究
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摘要
八道湾组是焉耆盆地四十里城凹陷当前寻找隐蔽圈闭的重点层位之一,但相关研究还有待深入。为此,利用地震线描法对贯穿四十里城凹陷的4条测线八道湾组进行了沉积盆地原形恢复,通过对其内部地层堆砌方式、反射波终止类型及钻井岩性组合特征的分析,将八道湾组划分为3个层序,并在层序内部识别出低位、水进、高位和强制水退体系域,从而搭建了研究区八道湾组层序地层格架;在此基础之上,结合沉积构造背景,开展格架内的地震相—沉积相分析,识别出低位三角洲、冲积扇、河道等沉积相带。结果表明,强制水退体系域发育的系列前积层为砂泥互层的响应,具有发育岩性圈闭的潜力,是下一步勘探研究工作的重点。
In Sishilicheng depression of Yanqi Basin, Badaowa Formation becomes one of the most important payzones when searching for subtle trap. In this study, the formation is restored through seismic-line description and by 4 seismic lines across the depression. And then, the arrange style and reflection termination kind of inner layers and the drilling lithological compound characteristics are analyzed. Badaowa Formation can be classified into 3 sequences. And 4 tract systems are also recognized (including low stand tract, transgressive tract system, highstand tract and forced regressive tract system) within these sequences. In addition, some sedimentary facies belts are presented, including lowstand delta, alluvial fan and channel, based on an analysis of both seismic faices and sedimentary facies. The results illustrate that the series foreset developed at forced regressive tract system not only is a response of sandstone interbedded with shale, but also has a potential to developing lithological trap. It will be an important target for further exploration.
In Sishilicheng depression of Yanqi Basin, Badaowa Formation becomes one of the most important payzones when searching for subtle trap. In this study, the formation is restored through seismic-line description and by 4 seismic lines across the depression. And then, the arrange style and reflection termination kind of inner layers and the drilling lithological compound characteristics are analyzed. Badaowa Formation can be classified into 3 sequences. And 4 tract systems are also recognized (including low stand tract, transgressive tract system, highstand tract and forced regressive tract system) within these sequences. In addition, some sedimentary facies belts are presented, including lowstand delta, alluvial fan and channel, based on an analysis of both seismic faices and sedimentary facies. The results illustrate that the series foreset developed at forced regressive tract system not only is a response of sandstone interbedded with shale, but also has a potential to developing lithological trap. It will be an important target for further exploration.
引文
[1]邱荣华,陈文礼,林社卿,等.焉耆盆地中生界层序地层和沉积体系分析[J].地球科学:中国地质大学学报,2001,26(6):615-620.
[2]吴明荣,姜在兴.焉耆盆地岩性油气藏勘探前景[J].新疆石油地质,2001,22(5):417-420.
[3]蔡佳,王华.焉耆盆地博湖坳陷三工河组层序格架及沉积体系的时空配置关系[J].地质科技情报,2008,27(4):8-13.
[4]蔡佳,王华.焉耆盆地博湖坳陷形成过程及动力学机制[J].地球科学:中国地质大学学报,2008,33(4):555-563.
[5]陈建军,刘池洋.中生代焉耆盆地演化特征[J].西北大学学报,2007,37(2):287-290.
[6]刘玉林,张龙.潮湿扇、河流、湖泊沉积体系及其沼泽沉积特征:以焉耆盆地为例[J].西北大学学报,2006,36(2):267-269.
[7]徐国强.南海东北部白云—荔湾凹陷珠海—韩江组层序地层格架模式[D].成都理工大学,2009:53-59.
[2]吴明荣,姜在兴.焉耆盆地岩性油气藏勘探前景[J].新疆石油地质,2001,22(5):417-420.
[3]蔡佳,王华.焉耆盆地博湖坳陷三工河组层序格架及沉积体系的时空配置关系[J].地质科技情报,2008,27(4):8-13.
[4]蔡佳,王华.焉耆盆地博湖坳陷形成过程及动力学机制[J].地球科学:中国地质大学学报,2008,33(4):555-563.
[5]陈建军,刘池洋.中生代焉耆盆地演化特征[J].西北大学学报,2007,37(2):287-290.
[6]刘玉林,张龙.潮湿扇、河流、湖泊沉积体系及其沼泽沉积特征:以焉耆盆地为例[J].西北大学学报,2006,36(2):267-269.
[7]徐国强.南海东北部白云—荔湾凹陷珠海—韩江组层序地层格架模式[D].成都理工大学,2009:53-59.
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