作　　者： (丛森）; (丁文龙）; (尹帅）;

机构地区： 中国地质大学能源学院,北京100083\中国地质大学海相储层演化与油气富集机理教育部重点实验室,北京100083\页岩气资源战略评价国土资源部重点实验室

出　　处： 《科技通报》 2017年第8期32-38,184,共8页

摘　　要： 致密砂岩储层成岩演化过程中,压实及胶结作用对储层性质具有极为重要的影响,探讨致密砂岩储层压实-胶结作用演化路径,对恢复地质历史时期致密储层孔隙演化及制定合理勘探开发方案具有重要参考价值。基于此,本文重点探讨了致密砂岩储层压实及胶结作用演化路径及相应岩石力学性质变化特征。研究结果表明,成岩演化早期,岩石物性及力学性质变化主要受压实作用影响,胶结作用不显著;而成岩晚期压实作用对岩石物性及力学性质变化的影响较小,此时胶结作用起最主要的影响作用。随着成岩作用的进行,致密砂岩内部孔隙逐渐均一化,并且有趋近于圆形的趋势。剥蚀过程中地层岩石应力的降低幅度要大于沉积过程中地层岩石应力的增加幅度。因此,对于发生过强烈剥蚀作用的沉积盆地,其内部发育的致密砂岩储层往往具有相对好的物性条件及油气开发潜力。致密砂岩压实-胶结作用演化过程中伴随着孔隙度及力学性质的变化,深入探讨其相互间作用关系,可以为致密砂岩储层评价及甜点区预测提供参考。 During the diagenetic evolution of tight sandstone reservoir,compaction and cementation have very important influence to the reservoir properties.Making deep research of tight sandstone reservoir compaction and cementation evolution path have important reference to restore tight reservoir pore evolution in geological history period and formulate reasonable exploration and development project.Based on this,this paper probes into the tight sandstone reservoir compaction and cementation evolution path and the corresponding characteristics of rock mechanics properties change.The research results show that in the early diagenetic evolution period,change of rock physical property and mechanical property are mainly effected by compression,cementation was not significant.And in late diagenetic period,effect of compaction on rock physical property and mechanical property is small,the influence of cementation is of the main role.Along with the diagenesis,pores in tight sandstone gradually become homogenization and has a tendency to be round.Stress reduction amount in the process of denudation is greater than the increase amount of in the process of deposition.Therefore,for sedimentary basin that has experienced strong denudation,the internal tight sandstone reservoir tend to have relatively good physical condition and development potential of oil and gas.In the process of compaction and cementation evolution of tight sandstone reservoirs,along with the change of porosity and mechanical properties,discuss the relationship between them each other,can provide the reference for tight sandstone reservoir evaluation and dessert area prediction.

关 键 词： 致密砂岩 压实作用 胶结作用 演化路径 力学分析