石臼坨凸起南部陡坡带扇三角洲沉积特征研究  

Research on the sedimentary characteristics of fan deltaon the southern steep-slope of Shijiutuo Uplift

作　　者：吕世聪 王少鹏 张汶 柳佳期 王西杰 LYU Shicong;WANG Shaopeng;ZHANG Wen;LIU Jiaqi;WANG Xijie(Bohai Oil Research Institute,CNOOC China Ltd.,Tianjin Branch,Tianjin,300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300459

出　　处：《天然气与石油》2024年第1期54-62,共9页Natural Gas and Oil

基　　金：“十三五”国家科技重大专项“渤海油田高效开发示范工程”(2016ZX05058)。

摘　　要：近年通过钻探在渤海中部海域石臼坨凸起南部陡坡带东三段发现了大型扇三角洲沉积,其具有储层厚度大、岩性复杂、横纵向非均值性强等特征。充分利用录井、测井、壁心和薄片等分析化验资料,对扇三角洲的沉积模式、储层特征、沉积微相特征以及储层展布特征进行研究。结果表明石臼坨凸起南部C构造东三段为湖盆陡坡带的吉尔伯特型扇三角洲沉积,主要发育扇三角洲前缘的近岸水道、远岸水道和水下分流河道间沉积微相。其中近岸水道粒度较粗,以含砾砂岩、砂砾岩为主,储集空间以原生孔隙为主,物性较差,为低孔低渗型储层;远岸水道粒度较细,以含碳酸盐中细砂岩为主,次生溶蚀孔隙发育,物性较好,多为中孔中渗型储层。同时根据地震层序和时频分析技术可将其砂体纵向划分为四期扇体,结合沉积模拟和地震属性,识别了四期扇体的展布范围。研究成果可为扇三角洲储层的油气田勘探开发提供借鉴指导。The C structure is situated on the steep southern slope of the Shijiutuo uplift in the E 3d 3 layer.Due to the complexity of its lithology,this study leverages an array of basic data,including drilling records,log data,sidewall coring samples,thin section analysis,and assay reports.Together with a review of the literature and pattern analysis,the research delves into the sedimentary characteristics of the fan delta in E 3d 3.It examines the sedimentary microfacies,the reservoir properties,and their distribution.The results show that the E 3d 3 of C1 well comprises a Gilbert-type fan delta,developed in the deep-slope of lake basin.This delta predominantly features fan-delta front sub-facies.The identified micro-faces include nearshore channel microfacies,offshore channel microfacies and underwater distributary interchannel varieties.The nearshore channel microfacies sediments are characterized by coarse grain size,lower textural maturity,primarily consisting of pebbled sandstone and sandy conglomerate.Reservoir has more primary pore,which is the low porosity and low permeability reservoir.In contrast,the offshore channel microfacies is mostly fine grained sediments,with medium-to-fine sandstone that often contains carbonate and exhibits a higher degree of secondary dissolution porosity.The reservoir possess medium level of both porosity and permeability,indicating better physical properties.The study utilizes both seismic stratigraphy and time-frequency analysis techniques to divide the sand bodies longitudinally into four phases of fan bodies.By combining sedimentary simulation and seismic attributes,the distribution range of the four fan bodies has been identified.The research results can serve as a reference and guide for the exploration and development of oil and gas fields in fan delta reservoirs.

关 键 词：陡坡带 石臼坨凸起 扇三角洲 沉积特征 地震属性 

分 类 号：P618.13[天文地球—矿床学]