松辽盆地松科1井上白垩统—下古新统明水组沉积序列厘米级精细刻画:岩性·岩相·旋回  

Centimeter-scale sedimentary sequence description of Upper Cretaceous-Lower Paleocene Mingshui Formation: Lithostratigraphy,facies and cyclostratigraphy,based on the scientific drilling(SK1) borehole in the Songliao Basin

作　　者：程日辉[1] 王国栋[2,1] 王璞珺[1] 高有峰[3] 任延广[4] 王成善[5] 张世红[5] 汪清源[4] 

机构地区：[1]吉林大学地球科学学院,吉林长春130061 [2]中国石油勘探开发研究院西北分院,甘肃兰州730020 [3]吉林大学古生物学与地层学研究中心,吉林长春130026 [4]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [5]中国地质大学北京地球科学与资源学院,北京100083

出　　处：《地学前缘》2011年第6期285-328,共44页Earth Science Frontiers

基　　金：国家重点基础研究发展计划“973”项目(2012CB822002);国家自然科学基金项目(40972074)

摘　　要：中国白垩纪大陆科学钻探松科1井连续取明水组岩心长558.94m,岩心收获率为93.69%,是迄今获取的最连续完整的沉积记录。文章对此进行了厘米级(分层厚度2～5cm)沉积地质描述。明水组沉积时期与坎潘晚期至丹尼期对应。通过对松科1井明水组岩心的精细描述,揭示其岩性-岩相-旋回的沉积序列及其作用过程。明水组共识别出15种基本岩石类型,为曲流河、浅湖和滨湖亚相的河床滞留、点砂坝、天然堤、决口扇、决口水道、河漫滩、河漫湖、浅湖静水泥、临滨砂坝、风暴沉积、沙滩、泥滩、浊流、重力流水道等15种沉积微相。在岩相序列上识别出20种共361个米级旋回(六级旋回)、109个五级旋回、29个四级旋回、3个三级旋回。完整组段的厘米级刻画为高精度沉积过程研究提供了可能,明水组全井段取心对松辽盆地富氧事件、K/Pg界线、坳陷盆地晚期构造演化以及盆地浅层生、储、盖组合的研究具有重要意义,该文的精细描述资料为今后相关的深入研究提供了迄今最精准的基本地质素材。China Cretaceous Continental Scientific Drilling （CCSD） in the Songliao Basin, called SK1 project, col- iected 558.94 m of Mingshui Formation which corresponded to the late Campanian to Danian The borehole got a highly contifluous core section with recovery of 93. 69%, that is the most complete and precise sedimentary records up to now in the basin. Thicknesses of the description can be as thin as 2 - 5 cm for the interbedding sequences. We described in centimeter-scale the sedimentary sequence, lithology, lithofacies and cyclic stratigra- phy at the drilling spot. Fifteen litho-types were recognized in the section. Sedimentary facies are predominantly river and lacustrine that can be subdivided into fifteen microfacies including point bar, natural levee, crevasse splay, crevasse channel, flood plain, flood lake, mudstone of still water, nearshore bar, tempestite, sandy beach, mudy beach, turbidite and gravity flow channel microfacies. The whole sequence is composed of 361 meter-scale cycles （sixth-order cycle）, 109 fifth-order cycles, 29 fourth-order cycles and 3 third-order cycles. Centimeter scale depiction of the section revealed some previously unknown horizons, which is very important for us to inter- pret basin evolution features such as lake oxic events, K/Pg boundary, tectonism in late sag basin stage and the source-reservoir-cap rock assemblages in shallow stratigraphy. That is to say, the scientific drilling provides us with powerful insight into the basin Researchers who are interested in the basin can do their reasonable analysis of the basin on the basis of the precise original materials in the paper.

关 键 词：松辽盆地 松科1井 明水组 沉积相 沉积序列 旋回地层 

分 类 号：P534.53[天文地球—古生物学与地层学]