Comprehensive Identification Methods of Condensate Oil-gas Reservoir in the Beibu Gulf Basin
Received date: 2014-05-21
Revised date: 2014-07-28
Online published: 2015-03-10
There were plenty of condensate gas,volatile oil,black oil and transition fluid in the Beibu Gulf Basin.Its hydrocarbon component was complicated,and it had similar logging response characteristics,so it was difficult to identify and evaluate condensate reservoir effectively.According to the result of testing,sampling and dynamic production,the fluid could be classified using oil density and gas-oil ratio.Based on this,many methods including four-porosity difference-ratio and ratio of P wave to S wave were adopted to identify the condensate gas-oil.These methods also face practical problems and is application is limited due to the restrictions of all sorts of factors in the offshore oilfield.Therefore,the classification was carried out firstly for different oil-source areas,and each area has different oil property and migration direction.The distribution characteristics and migration pattern of condensate gas-oil were analyzed,the ratio of gas logging components was applied and Triangle Chart was modified to build the quantitative interpretation standard for fluid properties.The results could be proved by pressure point regression,sampling,testing or PVT fluid analysis.The results show that using above-mentioned methods to make a comprehensive analysis and mutual corroboration can recognize condensate gas-oil effectively,and the methods have been applied in various regions in the western South China Sea.
WU Jian,HU Xiang-yang,ZHENG Xiang-wei,SHU Ke-dong,WU Yi-xiong . Comprehensive Identification Methods of Condensate Oil-gas Reservoir in the Beibu Gulf Basin[J]. Natural Gas Geoscience, 2015 , 26(3) : 495 -504 . DOI: 10.11764/j.issn.1672-1926.2015.03.0495
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