| 石西地区八道湾组三段辫状河三角洲的识别与沉积特征研究 |
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| 引用本文： | 文佳涛,吴爱成 但玲玲 原 园,程 文,樊文阔,随大伟.石西地区八道湾组三段辫状河三角洲的识别与沉积特征研究[J].中国地质,2012,39(1):54-63. |
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| 作者姓名： | 文佳涛 吴爱成 但玲玲 原 园 程 文 樊文阔 随大伟 |
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| 作者单位： | 长江大学地球科学学院;长江大学油气资源与勘探技术教育部重点实验室;新疆油田公司勘探开发研究院勘探所;中国石油大学(北京)地球科学学院 |
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| 摘 要： | 针对前人提出准噶尔盆地腹部石西地区下侏罗统八道湾组三段为曲流河三角洲沉积的观点,笔者根据碎屑岩的结构、沉积构造及砂体的空间展布等特征,认为八道湾组三段是在较强水动力条件下牵引流沉积的产物,其沉积环境应属于辫状河三角洲沉积。通过对研究区八道湾组三段辫状河三角洲的沉积特征进行综合研究,认为该区辫状河三角洲发育2种亚相和5种微相:辫状河三角洲平原分流河道、河漫沼泽,辫状河三角洲前缘水下分流河道、支流间湾、河口砂坝。并分析了其展布特征与演化过程,推测该区八道湾组三段沉积早期湖平面下降,研究区内发育辫状河三角洲前缘沉积;中期湖平面继续下降,发育辫状河三角洲平原沉积;晚期湖平面上升,沉积物有所变细。西北部哈拉阿拉特山—德仑山及扎伊尔山物源体系是其主要物源区。
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| 关 键 词： | 辫状河三角洲 曲流河三角洲 沉积特征 沉积演化 石西地区 八道湾组三段 |
The Identification of the braided fluvial delta in the 3rd Member of Badaowan Formation in Shixi area and a study of its sedimentary characteristics |
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| WEN Jia-tao,WU Ai-cheng,DAN Ling-ling,YUAN Yuan,CHENG Wen,FAN Wen-kuo,SUI Da-wei.The Identification of the braided fluvial delta in the 3rd Member of Badaowan Formation in Shixi area and a study of its sedimentary characteristics[J].Chinese Geology,2012,39(1):54-63. |
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| Authors: | WEN Jia-tao WU Ai-cheng DAN Ling-ling YUAN Yuan CHENG Wen FAN Wen-kuo SUI Da-wei |
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| Institution: | 1,2 (1.School of Geoscience,Yangtze University,Jingzhou 434023,Hubei,China;2.Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,Jingzhou 434023,Hubei,China; 3.Research Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Karamay 834000,Xinjiang,China; 4.School of Geoscience,China University of Petroleum,Beijing 102200,China) |
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| Abstract: | The sedimentary facies of 3rd Member of Lower Jurassic Badaowan Formation in Shixi area of Junggar Basin was previously regarded as meandering river delta.The authors consider it to be the product of tractive current under fairly strong hydrodynamic conditions,as evidenced by the texture,sedimentary structure and distribution characteristics of the sandstone.Its sedimentary environment belongs to the braided fluvial delta.Based on a synthetic study of its sedimentary characteristics,the authors identified 2 subfacies and 5 microfacies in the study area,which include the braided delta distributary channel,braided delta flood plain swamp,braided delta subaqueous distributary channel,tributary bay,and mouth bar.The distribution characteristics and evolution processes of sedimentary facies are inferred as follows: during the early stage the water level fell,the study area developed braided delta front;in the middle stage the water level continued falling,the study area developed braided delta plain;in the late stage the water level rose,and the sediments became thinning.The northwest Halaalate Mountain,Delun Mountain and Zhayier Mountain located in the margin of the study area constituted the main material sources. |
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| Keywords: | braided fluvial delta meandering river delta sedimentary characteristics depositional evolution Shixiarea 3rd Member of Badaowan Formation |
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