天然气地质学

含CO2气层孔隙度计算方法

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  • 西南石油大学地球科学与技术学院,四川 成都 610500
赵军(1970-),男,四川成都人,教授,博士,主要从事岩石物理及其解释与评价研究. E-mail:zhaojun_70@126.com.

收稿日期: 2015-05-19

  修回日期: 2015-09-04

  网络出版日期: 2019-09-20

基金资助

国家“十二五”科技重大专项子课题“莺琼盆地高温高压地层岩石地球物理特征与地震属性技术研究”(编号:2011ZX05023-004-02)资助.

Porosity calculation method for CO2-containing gas reservoirs

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  • School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China

Received date: 2015-05-19

  Revised date: 2015-09-04

  Online published: 2019-09-20

摘要

南海西部海域莺琼盆地为高温高压高含CO2含油气盆地,在储层测井评价孔隙度计算过程中,由于气、水性质的差异,若用岩心刻度法求取储层孔隙度,会导致计算的孔隙度值不能反映地层的真实情况,对此,提出联合体积物理模型和阿尔奇公式的方法求解含气储层孔隙度。此外,考虑到研究区CO2的影响,首先将CO2对流体密度以及地层水电阻率的影响进行了分析,然后确定相应的计算参数。应用表明,该联合求解孔隙度的方法较简洁,且解释结果与经覆压校正后的岩心孔隙度吻合较好,平均误差为5.81%,满足该区储层评价的要求,说明了该方法的可靠性。该方法可为高温高压高含CO2含气储层测井孔隙度计算提供一种新的选择。

本文引用格式

赵军, 杨阳 . 含CO2气层孔隙度计算方法[J]. 天然气地球科学, 2016 , 27(4) : 571 -576 . DOI: 10.11764/j.issn.1672-1926.2016.04.0571

Abstract

Yingqiong Basin in western of South China Sea is a hydrocarbon-bearing basin,with high temperature and high pressure,as well as CO2.In the process of reservoir porosity calculation,due to differences in gas and water properties,if we choose the method of core calibration,the calculated result of porosity will not reflect the real situation of formation.To solve this problem,a new method was put forward: to combine physical model and Archie’s method to calculate the porosity of gas reservoir.Moreover,the impact of theCO2 was also taken into consideration: the effect of CO2 on density and formation water resistivity.The processing of some practical data was used to illustrate the effect of this method.The result shows a good accordance between logging’s porosity and core porosity corrected by using the method of core overburden pressure,and the average error is 5.81 percent.This method provides a new option for logging to calculate porosity in CO2-containing gas reservoirs.

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