中国石油大学学报（自然科学版）2024，Vol.48Issue(2)：37-44,8.DOI:10.3969/j.issn.1673-5005.2024.02.004
鄂尔多斯盆地长7泥岩生-储-排油特征及演化模式
Source-reservoir-oil characteristics and evolution model of Chang 7 shale in Ordos Basin
摘要
Abstract
Based on hydrocarbon generation simulation experiments,this study investigates oil generation,storage,and discharge,as well as the thermal evolution characteristics of the Chang 7 mudstone in the Ordos Basin.Through the inte-gration of high-pressure mercury injection,liquid nitrogen adsorption,nuclear magnetic resonance,and other testing meth-ods,the generated crude oil and its mobility was discussed,culminating in the establishment of a comprehensive evolution model for the oil.The findings indicate that the peak oil generation of Chang 7 mud shale occurs near a maturity level of Ro=1.0%,corresponding to approximately 120 mg/g TOC.Subsequently,as maturity increases,the quantity of liquid hydrocarbons gradually decrease while gaseous hydrocarbons show a gradual increase.The cumulative hydrocarbon genera-tion continues to rise.The discharge of liquid hydrocarbons reaches its maximum(about 64.55 mg/g TOC)at a Ro of 1.15%.As maturity further increases,the discharge rate of liquid hydrocarbons decreases rapidly.With the increase of thermal evolution degree,the micropore volume of Chang 7 mud shale continues to increase,while the mesopore volume initially increases and then decreases.The macropore volume exhibits an initial decrease followed by an increase.The movable fluid saturation experiences an initial increase,followed by a decrease,and then another increase with increasing thermal maturity.On average,the movable fluid content in mudstone with varying maturity levels is 23.17%.Based on the data pertaining to hydrocarbon generation,expulsion,retention,pore evolution,and movable fluid,the evolution process of Chang 7 mudstone can be divided into four stages:low maturity,mature self-saturation,mature drainage,and mature-high maturity.关键词
鄂尔多斯盆地/页岩油/生排烃/可动流体/演化模式Key words
Ordos Basin/shale oil/hydrocarbon generation and expulsion/movable fluid/evolution model分类
能源科技引用本文复制引用
葛云锦,贺永红,许璟,马芳侠,杜克锋,李红进..鄂尔多斯盆地长7泥岩生-储-排油特征及演化模式[J].中国石油大学学报（自然科学版）,2024,48(2):37-44,8.基金项目
陕西省科技统筹创新工程计划项目(2012KTZB03-03) （2012KTZB03-03）
