欠压实作用下地层异常压力定量评价方法及应用

周鹏高

doi:10.3969/j.issn.1006-6535.2023.06.004

特种油气藏 >

2023 , Vol. 30 >Issue 6: 23 - 30

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.06.004

地质勘探

欠压实作用下地层异常压力定量评价方法及应用

周鹏高

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克拉玛依职业技术学院,新疆克拉玛依 834000

周鹏高(1981—),男,副教授,2004 年毕业于西南石油学院资源勘查工程专业,2007 年毕业于西南石油大学油气井工程专业,获硕士学位,现主要从事石油工程岩石力学方面的教学与科研工作。

收稿日期: 2023-04-10

修回日期: 2023-09-10

网络出版日期: 2024-01-19

基金资助

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)

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Quantitative Evaluation Method of Anomalous Formation Pressure Under the Effect of Undercompaction and Its Application

Zhou Penggao

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Karamay Vocational & Technical College, Karamay, Xinjiang 834000, China

Received date: 2023-04-10

Revised date: 2023-09-10

Online published: 2024-01-19

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摘要

目前以欠压实理论为基础的地层压力预测方法本质上均属于经验模型,不具备通用性,且预测精度受多方面因素制约。为此,从岩石孔隙体积与流体体积角度开展了异常地层压力的定量研究。根据多孔介质弹性力学理论,考虑温度、应力、流体成分、深度变化等因素,建立了欠压实作用下地层异常压力及压力系数的定量评价模型。该模型适用于欠压实作用为主要成因的异常地层压力评价,具有较高的精度。模拟计算结果表明:欠压实作用下地层压力增大,但由于埋深增大,压力系数可能增大、不变或减小,埋深增大对压力系数的影响不容忽视;欠压实作用既可形成异常高压也可形成异常低压;地层压力及压力系数的变化与流体和岩石的物理性质、地层深度增量及初始深度有关;流体的压缩系数、地层深度增量的影响较为显著,其他因素的影响相对较弱。研究成果突破了前人对欠压实作用与异常高压关系的认知,丰富和发展了欠压实理论。

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

本文引用格式

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 . DOI: 10.3969/j.issn.1006-6535.2023.06.004

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 undercompaction, but the pressure coefficient may increase, remain unchanged or decrease due to the increase of burial 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 increment 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.

Key words： undercompaction; formation pressure; anomalous pressure; pressure coefficient; compression coefficient; influencing factors; evaluation model

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