苏里格地区山2-盒8段高分辨率层序地层分析及应用

Analysis and application of high resolution sequence stratigraphy of Shan 2-He 8 member in Sulige region

在对苏里格地区地表露头和钻井岩心、测井、地震资料综合分析的基础上,利用高分辨率层序地层学的理论体系和研究方法,根据基准面升降旋回特点及等时对比原则、沉积物体积划分与堆积方式、沉积体系配置以及层序界面特征等因素,据郑荣才3级层序级别划分标准,将苏里格气田上古生界山2段-盒8段组共划分为4个长期旋回,10个中期旋回。在高分辨率地层格架下,对研究区进行等时对比和砂体展布分析,认为研究区发育于层序界面两侧的砂体产出层位相对较稳定,厚度较大,常呈垂向上连续叠置、侧向上相互重叠的连通的毯状或宽带状展布,层序内的砂体产出层位的稳定性相对较差,厚度变化较大,局部地区砂体虽然有时可呈连续叠置状,但侧向上往往被洪漫的细粒沉积所分隔,大多呈局部连通的带状分布。

Based on the comprehensive analysis of outcrop,drilling core,logging and seismic data in Sulige region,using the high resolution sequence stratigraphy theoretical system and research method,based on the datum eustatic cycle,isochronous correlation,the sediment volume partition and accumulation type,sedimentary deployment system and sequence interface characteristics and other factors,according to Zheng Rongcai 3 grade sequence classification standard,the Sulige gas field upper Paleozoic Shan 2- He 8 member is divided into 4 long term cycles,10 middle term cycles.In the high resolution stratigraphic framework,the analysis of study area has been made on isochronous correlation interface on both sides is relatively stable,relatively thick,usually with vertical continuous overlay,lateral mutual overlay with connected blanked or band like distribution.The sand body layer within the sequence is relatively poor,large variation of thickness,local sand body although sometimes show a continuous laminated shape,but often laterally separated by a fine- grained sedimentary,mostly zonal distributed with partial connection.