特种油气藏2023，Vol.30Issue(6)：23-30,8.DOI:10.3969/j.issn.1006-6535.2023.06.004
欠压实作用下地层异常压力定量评价方法及应用
Quantitative Evaluation Method of Anomalous Formation Pressure Under the Effect of Undercompaction and Its Application
摘要
Abstract
The current formation pressure prediction methods based on the undercompaction theory are essentially empirical models,which are not generalizable,and the prediction accuracy is constrained by various factors.For this reason,the quantitative study of anomalous formation pressure was carried out from the perspective of rock pore volume and fluid volume.According to the theory of elastic mechanics of porous media,the quantitative evaluation model of anomalous formation pressure and pressure coefficient under the effect of undercompaction was established by comprehensively considering the factors such as temperature,stress,fluid composition,and depth change.The model is applicable to the evaluation of anomalous formation pressure with undercompaction as the main genesis,and has high accuracy.The simulation results show that the formation pressure increases under the effect of the un-dercompaction,but the pressure coefficient may increase,remain unchanged or decrease due to the increase of bur-ial depth,and the influence of the increase of burial depth on the pressure coefficient shall not be neglected;the undercompaction can form both anomalous high pressure and anomalous low pressure;the changes of the formation pressure and the pressure coefficient are related to the physical properties of the fluid and the rock,and the incre-ment of the formation depth as well as the initial depth;the influences of the compression coefficient of the fluid and the increment of the formation depth are relatively significant,while the influences of other factors are relatively weak.The research results break through the previous knowledge of the relationship between undercompaction and anomalous high pressure,and enrich and develop the theory of undercompaction.关键词
欠压实/地层压力/异常压力/压力系数/压缩系数/影响因素/评价模型Key words
undercompaction/formation pressure/anomalous pressure/pressure coefficient/compression coeffi-cient/influencing factors/evaluation model分类
石油、天然气工程引用本文复制引用
周鹏高..欠压实作用下地层异常压力定量评价方法及应用[J].特种油气藏,2023,30(6):23-30,8.基金项目
新疆维吾尔自治区自然科学基金"欠压实作用形成异常高压机理及定量评价方法研究"(2021D01A28) （2021D01A28）
