摘要
研究四川盆地中江气田中侏罗统沙溪庙组河道砂体内部结构特征及其对气水分布的影响。在现代沉积、野外露头、岩心、测井、地震资料和生产测试资料的基础上,开展了浅水三角洲分流河道砂体内部结构特征研究,建立了相应的构型模式,分析了不同河道构型模式下的气水分布特征。结果表明:沙溪庙组为曲流河入湖的河控浅水三角洲平原-前缘沉积,发育曲流型分流河道、低弯度分流河道和顺直型水下分流河道。曲流型分流河道和低弯度分流河道以侧积为主,发育边滩和废弃河道;顺直型河道以垂向加积为主,发育前积体和前积层。侧积层和废弃河道形成环状岩性(物性)封堵,导致曲流型分流河道内部部分侧积体含气性好,低弯度分流河道内部气、水呈“香肠式”分布,构造低部位也可见气层发育。顺直型分流河道主要发育水平夹层,沿河道非均质性弱,河道内部呈上气下水分布模式,构造高部位主要为气层,低部位和近断层处以气水同层和水层为主。
On the basis of modern sedimentary data,outfield data,drilling core data,logging data,seismic data and production test data,the internal structure characteristics of shallow-water delta distributary channel sand bodies in middle Jurassic Shaximiao Formation in Zhongjiang Gas Field,Sichuan Basin are studied,and its corresponding configuration model is established.Then,the distribution characteristics of gas and water under different channel configuration models are analyzed in order to explore the internal structure characteristics of channel sand body and its influence on gas and water distribution in the area.The material of Shaximiao Formation is shallow-water delta plain front deposition,formed in the channel where meandering river enters the lake and where meandering distributary channels,low sinuosity distributary channels and straight underwater distributary channels developed.Meandering distributary channels and low sinuosity distributary channels are dominated by side deposits,with point bars and abandoned channels developed.The straight channel is dominated by vertical accretion with foreset body and foreset bed.The lateral deposits and abandoned channels form circular lithologic(or physical property)blockages,leading to good gas content in some lateral deposits in meandering distributary channels.The gas and water in low sinuosity distributary channels are“sausage type”distribution,and gas layer development can also be seen in low structural parts.Horizontal interbeds are mainly developed in straight distributary channels,and the heterogeneity along the channels is weak.In the channel,the distribution characteristics of upper gas and lower water are shown,and the high parts of the structure are mainly composed of gas layer,while the low parts and near fault layer are mainly composed of gas&water and water layers.
作者
衡勇
段新国
王勇飞
高伟
刘成川
HENG Yong;DUAN Xinguo;WANG Yongfei;GAO Wei;LIU Chengchuan(Research Institute of Exploration and Development, Southwest Oil & Gas Company, SINOPEC, Chengdu 610041, China;Post-doctoral Scientific Research Station, Southwest Oil & Gas Company, SINOPEC, Chengdu 610041, China;State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第1期1-11,共11页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国家自然科学基金项目(41672105)
国家科技重大专项(2016ZX05048)。
关键词
中江气田
沙溪庙组
分流河道
砂体构型
气水分布
Zhongjiang gas field
Shaximiao Formation
distributary channel
sand body configuration
gas and water distribution
