• 责任者：He Shenglin (Zhanjiang Branch ; CNOOC ; Zhanjiang 524057 ; China) ; Chen Rong
• 刊名：Natural Gas Industry
• 出版年：2013
• 卷期：33(11)
• 关键词：气藏 ; gas reservoirs ; 地球物理测井 ; geophysical logging ; 莺歌海盆地 ; Yinggehai Basin
• 页码：p.22-27
• 图表：4 illus., 2 tables, 13 refs.
• 分类号：1600
• issnNo：ISSN1000-0976
• isbnNo：CN51-1179/TE

     The reservoirs in the Ledong Gas Field, Yinggehai Basin, are buried shallow, the major pay zone of which is the Quaternary Ledong Formation with a burial depth of 950 - 1300 m. Apart from methane-dominated hydrocarbon gases, gas reservoirs there also contain a great volume of non hydrocarbon gases like CO2. How to differentiate between hydrocarbon gases and CO2 and deter mine their content is a new challenge to the logging evaluation in this study area. Therefore, on the basis of the logging data, we first identified hydrocarbon and non-hydrocarbon gas zones~ then adopted the cross plot to present their difference reflected from the log ging response. Thus, we were able to quantitatively judge if it is a hydrocarbon or COz gas zone. Meanwhile, we adopted the formation ingredient analysis model and the optimization theory to calculate the relative content of hydrocarbon and non-hydrocarbon gases under multiple constraint conditions. In this way, we can quantitatively identify the gas zone types, which will be a guidance for the exploration and exploitation operations in oil and gas fields. The actual field practices demonstrated that among 79% of the examined gas zones, the absolute error between the calculated relative content of hydrocarbon gases and the actual measurement was within 20%, which proved that this proposed method in this study is perfect.