| 作 者：张宝收,顾乔元,张海祖,赵青,尹峰林 |
| 单 位：中国石油塔里木油田分公司勘探开发研究院 |
| 基金项目：国家重点基础研究发展计划“973”项目（2006CB202307）资助 |
| 摘 要： |
| 塔中碳酸盐岩天然气样品中CO2含量及其碳同位素值的分析表明,CO2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CO2含量一般在5%以下,而高含量的CO2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CO2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CO2含量—酸量—时间相关关系图版。酸化压裂可使气样中的CO2含量增加,但对N2和H2S的含量没什么影响。增高的CO2会使和CO2含量有关的参数受到影响,但不会影响和CO2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。 |
| 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 |
| Author's Name: Zhang Baoshou, Gu Qiaoyuan, Zhang Haizu, Zhao Qing, Yin Fenglin |
| Institution: Institute of Exploration and Development, PetroChina Tarim Oilfield Company |
| Abstract: |
| 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 all 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 generally 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 acidamount 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 N2 and H2S content. The increasing CO2 can affect the parameters related with CO2 content but cannot affect those parameters which have no relation to CO2 content. Some suggestions how to use the analysis data of gas samples are finally put forward. |
| Keywords: Tazhong area; Carbonate rock; Natural gas; Genesis of carbon dioxide; Carbon isotope; Acid fracturing |
| 投稿时间： 2009-12-21 |
