塔中地区碳酸盐岩高含量二氧化碳的产生及研究意义  

Genesis and Study Significance of High CO_2 Content in Carbonate Rocks in Tazhong Area,Tarim Basin

作　　者：张宝收[1] 顾乔元[1] 张海祖[1] 赵青[1] 尹峰林[1] 

机构地区：[1]中国石油塔里木油田分公司勘探开发研究院

出　　处：《海相油气地质》2010年第3期70-73,共4页Marine Origin Petroleum Geology

基　　金：国家重点基础研究发展计划"973"项目(编号:2006CB202307)资助

摘　　要：塔中碳酸盐岩天然气样品中CO_2含量及其碳同位素值的分析表明,CO_2既有有机成因也有无机成因,而烃气则全为有机成因。样品对比表明,塔中碳酸盐岩天然气中的CO_2含量一般在5%以下,而高含量的CO_2则是酸化压裂时由人工注入的强酸与碳酸盐岩地层反应产生的。酸化压裂产生的CO_2含量与注入地层的酸量正相关,与求产时间负相关;据此建立了最高CO_2含量—酸量—时间相关关系图版。酸化压裂可使气样中的CO_2含量增加,但对N_2和H_2S的含量没什么影响。增高的CO_2会使和CO_2含量有关的参数受到影响,但不会影响和CO_2含量无关的研究参数。对天然气分析数据的使用提出了相关建议。The CO2 content and carbon isotopic values are analyzed for natural gas samples from carbonate rocks in Tazhong area.It is indicated that the CO2 gas in some gas samples is organic in origin and the one in other gas samples is inorganic but the hydrocarbon gas is al organic in origin.By comparing with four types of gas samples,it is improved that the CO2 content of natural gas from Tazhong carbonate rocks is general y less than 5%while the CO2 whose content is high is generated by acid fracturing.The CO2 content in the gas samples generated by acid fracturing has a positive correlation to the acid amount and keeps a negative correlation to the production time.According to the analysis data,a correlation chart of maximum CO2 content-acid amount-production time is established.Acid fracturing may bring in increasing the CO2 content in the gas samples but less affects on the N_2 and H_2S content.The increasing CO2 can affect the parameters related with CO2content but cannot affect those parameters which have no relation to CO2 content.Some suggestions how to use the analysis data of gas samples are final y put forward.

关 键 词：塔中地区 碳酸盐岩 天然气 二氧化碳成因 碳同位素 酸化压裂 

分 类 号：TE125.4[石油与天然气工程—油气勘探]