盖层厚度对天然气封闭能力的实验分析

林潼 , 王孝明 , 张璐 , 曾旭, 张帅 , 程煜宗

doi:10.11764/j.issn.1672-1926.2018.11.012

天然气地球科学 >

2019 , Vol. 30 >Issue 3: 322 - 330

DOI: https://doi.org/10.11764/j.issn.1672-1926.2018.11.012

天然气地质学

盖层厚度对天然气封闭能力的实验分析

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1.中国石油勘探开发研究院，北京 100083； 2.中国石油塔里木油田分公司勘探开发研究院，新疆库尔勒 841000； 3.中国石油华北油田公司第三采油厂地质研究所，河北河间 062450

林潼(1980-)，男，福建福州人，高级工程师，博士，主要从事天然气地质勘探与基础实验研究E-mail：lintong1980@163.com.

收稿日期: 2018-11-02

修回日期: 2018-11-27

网络出版日期: 2019-04-01

基金资助

中国科学院战略性先导科技专项A类(编号：XDA14010403)；中国石油股份公司科技项目(编号：2018A-0104)联合资助

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Experimental analysis of the effect of caprock thickness on sealed natural gas

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1.PetroChina Research Institute of Petroleum Exploration & Development，Beijing 100083,China；2.Research Institute of Exploration and Development of Tarim Oil Company of PetroChina，Korla 841000,China;
3.Geological Research Institute of the Third Oil Production Plant of Huabei Oilfield，PetroChina,Hejian 062450，China

Received date: 2018-11-02

Revised date: 2018-11-27

Online published: 2019-04-01

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摘要

盖层的封闭能力是评价油气藏保存条件的关键。然而盖层的厚度对盖层封闭能力的作用一直存在很大的争论。研究选取与塔里木盆地超深层勘探领域油气藏盖层岩性密切相关的膏岩、盐岩和白云岩样品开展岩石长度对气体突破压力影响的实验。通过标准测试法和恒压突破法相互结合、相互印证的手段来判别岩石长度的变化对突破压力值的影响。实验结果显示：气体突破均质岩样的压力值与岩样的长度相关性不明显，但长度影响了气体的突破时间；当恒压注气初始值大于样品自身的毛管压力值时，突破时间与岩样长度呈正相关性。通过对实验数据的解析认为：现行的标准测试法中每个注气点的压力保持时间过短，造成了最终测试突破压力值偏大，影响了封闭能力测试的真实性；突破压力值与均质岩样的长度无关，但受不同测试气体的影响突破压力值有所差异；从宏观上分析厚度对盖层的物性封闭能力影响不大，但是厚度对盖层的稳定性和阻止油气的扩散起到了积极作用。

关键词： 盖层厚度; 突破压力; 封闭能力; 标准测试法; 突破时间

本文引用格式

林潼 , 王孝明 , 张璐 , 曾旭, 张帅 , 程煜宗 . 盖层厚度对天然气封闭能力的实验分析[J]. 天然气地球科学, 2019 , 30(3) : 322 -330 . DOI: 10.11764/j.issn.1672-1926.2018.11.012

Abstract

The caprock sealing capacity is the key to evaluate the preservation conditions of oil and gas reservoirs.And the influence of thickness on capping ability has always been controversial.In this paper，samples of gypsum，salt rock and dolomite collected in Tarim Basin are used to test the effect of sample length on gas breakthrough pressure.The standard test method and the constant pressure gas breakthrough method are used to judge the influence of the variation of sample length on the breakthrough pressure.The experimental results show that:(1)the pressure value of gas breakthrough homogenization sample has no obvious correlation with the sample length，but the length affects the gas breakthrough time；(2)when the initial constant pressure of the gas is larger than the capillary pressure of the sample itself，the breakthrough time is positively correlated with the sample length.Through the analysis of the experimental data，it is concluded that:(1)the constant pressure time of each point in the current breakthrough pressure test is shorter，which causes the breakthrough pressure value to be higher；(2)the breakthrough pressure is independent of the length of homogeneous sample，but affected by different test gases；(3)macroscopically，the thickness has little effect on the sealing ability of the caprock，but the thickness has a positive effect on the stability of the caprock and prevents the diffusion of oil and gas.

Key words： Caprock thickness; Breakthrough pressure; Caprock sealing capacity; Standard test method; Breakthrough time

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