松辽盆地徐家围子断陷沙河子组顶界面特征研究——基于松辽盆地大陆科学钻探松科2井  

Characteristics of top boundary of Shahezi Formation in Xujiaweizi fault depression,northern Songliao Basin:illustrated by continental scientific drilling borehole SK2

作　　者：李宏浩[1] 高有峰 王璞珺[1] 瞿雪姣[4] 高翔[1] 陈海潮[1] LI Hong-hao;GAO You-feng;WANG Pu-jun;QU Xue-jiao;GAO Xiang;CHEN Hai-chao(College of Earth Sciences,Jilin University,Changchun 130061,China;Key iMhoraton for Evolution of Past life and Environment in Northeast Asia ( Ministry of Education ),Jilin University,Changchun 130026,China;Research Center of Paleontology and Stratigraphy,Jilin University,Changchun 130026,China;Chongqing University of Science and Tech nology,Chongqing 401331,China)

机构地区：[1]吉林大学地球科学学院,长春130061 [2]吉林大学东北亚生物演化与环境教育部重点实验室,长春130026 [3]吉林大学古生物学与地层学研究中心,长春130026 [4]重庆科技学院石油与天然气工程学院,重庆401331

出　　处：《世界地质》2018年第3期838-849,共12页World Geology

基　　金：国家重点基础研究发展计划"973"项目(2012CB822002);中国地质调查局油气基础性公益性地质调查项目(DD20160207--06)联合资助

摘　　要：为精确划分松辽盆地沙河子组层序地层,限定断陷期沙河子组与营城组地层时代,进而研究断陷期盆地的演化,笔者利用松辽盆地大陆科学钻探松科2井获取的下白垩统地层岩芯资料,从岩芯尺度对沙河子组与营城组界面进行揭示,结合过松科2井地震剖面解释、松科2井及邻井测井响应特征分析和岩芯精细描述,总结出沙河子组顶界面在不同尺度的具体特征:(1)在地震剖面尺度,其表现为明显上超的特征;(2)在测井曲线上,界面附近表现为由下到上自然伽马曲线变化幅度增大,双侧向电阻率曲线由低值变为中高值的特征;(3)岩芯尺度上,表现为细粒沉积的砂泥岩突变为砾岩或火山岩。To accurately divide the sequence stratigraphy of Shahezi Formation,restrict the stratigraphic age of Shahezi Formation and Yingcheng Formation in rifting stage and study the basin evolution during the period of fault depression,complete core data of the Lower Cretaceous from the continental scientific drilling borehole in Songliao Basin( SK2) is used to identify the boundary between Shahezi Formation and Yingcheng Formation. Combined with the interpretation of seismic profile across SK2,the analysis of logging response characteristics of SK2 and adjacent wells as well as detailed core description,the specific characteristics of the top boundary of Shahezi Formation at different scales are summarized in this study.(1) On the seismic profile scale,the boundary is associ-ated with obviously onlap.(2) On the well log,the amplitude of variation of natural gamma-ray logging curve has increased from the bottom to the top near the boundary,and the dual laterolog curves change from low to medium-high value,respectively.(3) On the core scale,the boundary is underlain by fine grained sandstone and mudstone,and overlain by conglomerate or volcanic rock.

关 键 词：松辽盆地 徐家围子断陷 松科2井 沙河子组顶界面 

分 类 号：P534.53[天文地球—古生物学与地层学]