准噶尔盆地永进地区白垩系清一段沉积相研究  

Sedimentary Facies Study of the Member 1 of Qingshuihe Formation(Cretaceous),Yongjin Area,Junggar Basin

作　　者：范忠礼[1] 张广雪 孙中强[1] 李存磊[1] 张鹏辉[2,3] 

机构地区：[1]山东科技大学地球科学与工程学院,山东青岛266510 [2]北京师范大学资源学院,北京100875 [3]首尔大学地球与环境科学学院

出　　处：《中国海洋大学学报（自然科学版）》2015年第8期83-89,共7页Periodical of Ocean University of China

基　　金：高等学校博士学科点专项科研基金项目(20110003110014);国家自然科学基金面上项目(41172109);山东省博士后创新专项资金项目(201306069)资助

摘　　要：本文通过对录、测井及薄片等资料的综合分析,结合岩心识别,开展了准噶尔盆地永进地区清一段沉积相类型的研究。本次研究识别出泥岩颜色、岩性、砂岩岩石学、粒度特征及沉积构造等方面的沉积相标志,明确了清一段的滩坝沉积特征:泥岩颜色以灰色为主,反映还原性水体环境,泥砂比很高,砂岩主要为粉、细砂岩,单砂体较薄;砂岩碎屑成分成熟度高,粒度概率曲线多见两个跳跃总体,滚动组分缺失,沉积环境经粒度参数判别为浅湖环境;浪成的波痕、沙纹层理以及各种交错层理发育,具有丰富的层内冲刷构造;地震属性分析及反演显示井间砂体连通性很差。研究区滩坝可进一步细分为沙坝、沙滩和与裂流有关的砂体三种微相。受古地貌以及湖泊水动力条件的影响,砂体连片性较差,剖面上为透镜状砂体。在沉积相特征分析的基础上,勾画了研究区滩坝砂体平行岸线,多不连通的展布形态,并建立了位于三角洲侧缘低缓凸起上的滩坝沉积模式。Based on well log data and observation of core and thin sections,sedimentary facies of Member1 of Qingshuihe Formation,the authors studied in Yongjin area,Junggar Basin.Referring to the regional geological background,detailed analysis has been conducted as following：mudstone color,lithology,petrology,grain-size characteristics as well as sedimentary tectonics.It comes to a conclusion that it is beach bar not delta or braided delta developed in Yongjin area.Sedimentary characteristics of the beach bar include as follows.The mudstone color is gray or dark gray,reflecting reductive water environment with thin single sand body thickness and high sand-shale ratio.The sandstone reservoir has higher composition maturity,and the results of identifying grain size parameters indicate shallow sea（lake）sedimentary environment,with two leaping components in grain size distribution and lacking rolling components.Ripple mark,ripple cross-lamination as well as various cross bedding are especially well developed and widely distributed in the sandstone of Member 1of Qingshuihe Formation built by wave,showing rich intrastratal erosive structures.Seismic attribute and inversion reflect bad connectivity of sand bodies.Three types of sedimentary facies have been recognized in the beach bar in Yongjin area,including sandbank,sand beach,and rip-built sand body.Controlled by ancient landform and the hydrodynamic condition,sand body is poorly cross connected and is always wrapped by mud,showing lenticular shape in vertical distribution.On the basis of detailed analysis of sedimentary characteristics,the article described the distribution of sand body and sedimentary environment showing that beach bar sand body is parallel to the coast line with unconnected pattern,the beach bar depositional model is established to locate in a gentle hump beside delta environment.

关 键 词：永进地区 清一段 沉积相识别 微相特征 沉积模式 

分 类 号：P539[天文地球—古生物学与地层学]