松辽盆地松科1井上白垩统四方台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 Sifangtai Formation: Lithostratigraphy,facies and cyclostratigraphy,based on the scientific drilling(SK1) borehole in the Songliao Basin

作　　者：王国栋[1,2] 程日辉[2] 王璞珺[2] 高有峰[3] 王成善[4] 任延广[5] 黄清华[5] 

机构地区：[1]中国石油勘探开发研究院西北分院,甘肃兰州730020 [2]吉林大学地球科学学院,吉林长春130061 [3]吉林大学古生物学与地层学研究中心,吉林长春130026 [4]中国地质大学(北京)地球科学与资源学院,北京100083 [5]大庆油田有限责任公司勘探开发研究院,黑龙江大庆1637123

出　　处：《地学前缘》2011年第6期263-284,共22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井北孔连续取四方台组岩心心长209.02m,岩心收获率为97.5%,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。四方台组沉积时期对应中—晚坎潘期。通过对松科1井四方台组岩心的精细描述,揭示其岩性-岩相-旋回的沉积序列及其过程。四方台组共识别出8种岩石类型,为曲流河、浅湖亚相的河床滞留、点砂坝、天然堤、决口扇、决口水道、河漫滩、河漫湖、临滨砂坝、静水泥质沉积和浊流沉积等10种沉积微相。在岩相序列上识别出15种共174个米级旋回(六级旋回)、43个五级旋回、13个四级旋回和2个三级旋回。完整组段厘米级刻画为高精度沉积过程研究提供了可能,四方台组全井段取心对松辽盆地富氧事件、潜在浅层油气储、盖组合等研究具有重要意义。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, collected 209.02 m of Sifangtai Formation which correspond to middle to late Campanian. The borehole got a highly continuous core section with recovery of 97.50/oo, that is the most complete and precise sedimentary re- cords up to now in the basin. Thicknesses of the description can be as thin as 2 - 5 cm for the interbedding se- quences. We described in cm-scale the sedimentary sequence, lithology, lithofacies and cyclic stratigraphy at the drilling spot. Eleven litho-types were recognized in the section. Sedimentary facies are predominantly mean- dering river and lacustrine that can be subdivided into ten microfacies including point bar, natural levee, crevasse splay, crevasse channel, floodplain, flood lake, nearshore bar, mudstone of still water, and turbidit~ The whole se- quence is composed of 174 meter-scale cycles （sixth-order cycle）, 43 fifth-order cycles, 13 fourth-order cycles and 2 third-order cycles. Centimeter scale description of the section revealed some previously unknown horizons such as spe- cial kind of mudstone, favorable sand reservoir of the formation. The new found evidences are very important for us to interprete basin evolution features such as lake oxic and the reservoir-cap rock assemblages in shallow stratigraphy. That is to say, the scientific drilling provides us with powerful insight in to the basin. Researchers who are interested in the basin can do their reasonable analysis about the basin based on the precise original materials of the paper.

关 键 词：松辽盆地 松科1井 四方台组 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]