Research on the CO2 gas logging evaluation technologyof HTHP reservoir in western South China Sea Basin

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  • Zhanjiang Branch of CNOOC Limited,Zhanjiang 524057,China

Received date: 2016-05-09

  Revised date: 2016-10-08

  Online published: 2019-09-06

Abstract

This paper discusses the problem of qualitative identification and quantitative evaluation of gas type by logging data in the high temperature and high pressure gas reservoir in the basin of the western  South China Sea.Due to the coexistence of hydrocarbon,non-hydrocarbon and water,the formation logging response gets complicate,and especially the additional conductivity has no obvious regularity when CO2 gas dissolved in water,making it very difficult to use the resistivity method for CO2 qualitative identification and quantitative calculation.So,we can calculate the parameter of Neutron-density intersection of the unit gas-bearing porosity,using Neutron-density intersection curve corrected by porosity and gas-saturation,on the basis of differences in neutron and density logging response of hydrocarbon and non-hydrocarbon gas.This parameter can be used to qualitatively identify non-hydrocarbon and hydrocarbon gas.By using the data of long & short source-distance and count-rate values of neutron logging which is corrected by standardized treatment and aqueous calibration,we can establish the numerical calculation model of CO2 content,according to the differences in thermal reduction and diffusion caused by hydrocarbon and non-hydrocarbon gas.The calculated CO2 content by this method is not quite different from the results of oil-testing and sampling,confirming the reliability of the quantitative calculation method of gas composition.

Cite this article

He Sheng-lin, Zhang Hai-rong, Yang Dong, Wu Yi-xiong . Research on the CO2 gas logging evaluation technologyof HTHP reservoir in western South China Sea Basin[J]. Natural Gas Geoscience, 2016 , 27(12) : 2200 -2206 . DOI: 10.11764/j.issn.1672-1926.2016.12.2200

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