东北石油大学学报2025，Vol.49Issue(3)：68-82,96,16.DOI:10.3969/j.issn.2095-4107.2025.03.006
重力流成因致密砂岩储层成岩相识别与分布
Diagenetic facies identification and distribution of gravity flow tight sandstone reservoirs:a case of Chang 7 reservoir in Heshuinan Area,Ordos Basin
摘要
Abstract
Tight sandstone reservoirs caused by gravity flow have strong heterogeneity and complex pore structure.The reservoir property is greatly affected by diagenesis.Diagenetic facies distribution restrict-ed optimum reservoir development under the background of the tight sandstone.Based on previous re-search,this article comprehensively utilizes rock cores,cast thin sections,scanning electron microsco-py,logging data,and random forest algorithm,to carry out diagenetic facies division,identification,and distribution prediction of the Chang 7 reservoir in Heshuinan(HSN)Area.The research has shown that:Chang 7 reservoir in Heshuinan Area is gravity flow sedimentation tight sandstone reservoir.Dur-ing the later diagenetic process due to sufferred from strong compaction and cementation,which causing reservoir densification.According the face rate and face rate of dissolved pores and strength of diagene-sis,the diagenetic facies can be divided into four types:tight compaction facies,strongly cementation intercrystalline micropore facies,composite pore facies and soluble component dissolution facies.Train a random forest model using partitioned lithofacies and logging curves as samples.And selecting five log-ging curves(DEN,GR,AC,RT,SP)to identify diagenetic facies.The accuracy of identifying diagenet-ic facies is as high as 85.4％.The distribution of diagenetic facies is generally in a strip like pattern a-long the source direction(SW-NE).The composite pore facies and soluble component dissolution facies have good oil content and are high-quality reservoir facies in the study area.It has clarified the distribu-tion characteristics of diagentic phase in Heshuinan Area.This achievement has guiding significance for the efficient development of tight sandstone oil.关键词
鄂尔多斯盆地/合水南地区/延长组/重力流/致密砂岩储层/成岩相Key words
Ordos Basin/Heshuinan Area/Yanchang Formation/gravity flow/tight sandstone reser-voirs/diagenetic facies分类
能源科技引用本文复制引用
付林圃,王喜鑫,马生晖,杨秦川,李少华,何右安,喻思羽,韩茂洲..重力流成因致密砂岩储层成岩相识别与分布[J].东北石油大学学报,2025,49(3):68-82,96,16.基金项目
中国石油科技创新基金项目(2021DQ02-0106) （2021DQ02-0106）
国家自然科学基金项目(42172172) （42172172）
甘肃省油气资源研究重点实验室开放基金项目(20221227) （20221227）
