开鲁盆地陆东凹陷九佛堂组沉积相及有利砂体分布  

SEDIMENTARY FACIES AND FAVORABLE SAND BODY DISTRIBUTION OF JIUFOTANG FORMATION IN LUDONG DEPRESSION,KAILU BASIN

作　　者：陈怀毅 张云峰[1] CHEN Huai-yi;ZHANG Yun-feng(College of Earth Sciences,Northeast Petroleum University,Daqing 163000,Heilongjiang Province,China)

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163000

出　　处：《地质与资源》2023年第6期732-742,共11页Geology and Resources

基　　金：国家自然科学基金项目“源下型陆相致密油富集机理及地质-工程甜点评价技术研究”(42172150).

摘　　要：为研究开鲁盆地陆东凹陷交力格地区九佛堂组层序格架下沉积特征和有利砂体的分布,采用灰色关联分析法求取综合评价因子RQI对有利储集相带进行预测,明确了九佛堂组沉积演化过程中不同沉积体系的动态变化及沉积相展布.通过层序界面、体系域界面识别将地层划分为低位域、湖浸域、高位域.在体系域内近岸堆积—半深湖和扇三角洲—滨浅湖两套沉积体系交替发育.低位域末期—湖浸域时期扇三角洲主要发育前缘相带.通过岩相特征、地震相特征、单井精细刻画等手段共识别8种不同沉积微相.对沉积相展布特征进行了详细刻画,并将储层划分为3类,其中扇三角洲前缘内牵引流成因砂体形成的储层最好,近岸堆积及前缘根部泥石流、洪流成因砂体形成的储层最差.此结果可为研究区进一步勘探开发提供依据.To study the sedimentary characteristics and distribution of favorable sand bodies in the sequence stratigraphic framework of Jiufotang Formation in Jiaolige area of Ludong depression,Kailu Basin,the paper adopts grey correlation analysis method to calculate the comprehensive evaluation factor of reservoir quality index(RQI)and predict the favorable reservoir facies belt,and defines the dynamic changes of different sedimentary systems and sedimentary facies distribution during the sedimentary evolution process of Jiufotang Formation.The strata can be divided into lowstand system tract,lake-flooding system domain and highstand system tract through the identification of sequence interface and system tract interface.Two sedimentary systems of nearshore accumulation-semi deep lake and fan delta-shore shallow lake are alternately developed in the system tract.The front facies belt is mainly developed in the fan delta during the late lowstand system tract and lake-flooding system domain periods.Eight sedimentary microfacies are identified based on the lithofacies,seismic facies characteristics and fine characterization of single well.Through the detailed characterization of sedimentary facies distribution characteristics,the reservoirs are divided into three categories,among which the reservoir formed by traction flow depositional sand bodies in fan delta front is the best,while those formed by nearshore accumulation,debris flow and torrent originated sand bodies in the front root are the worst.The results may provide a basis for further exploration and development of the study area.

关 键 词：九佛堂组 沉积相 有利砂体 灰色关联分析法 陆东凹陷 交力格洼陷 开鲁盆地 

分 类 号：P618.13[天文地球—矿床学]