南方海相烃源岩脱气分析方法及适用范围

DEGASIFICATION METHODS AND APPLICATION OF HIGH QUALITY MARINE SOURCE ROCKS IN SOUTH CHINA

张渠 蒋启贵 陶成 张彩明 把立强

Zhang Qu Jiang Qigui Tao Cheng Zhang Caiming Ba Liqiang

中国石油化工股份有限公司, 石油勘探开发研究院, 无锡石油地质研究所, 江苏, 无锡, 214151

Wuxi Research Institute of Petroleum Geology, Research Institute of Petroleum Exploration and Production, SINOPEC, Wuxi, Jiangsu 214151, China

对南方海相烃源岩进行吸附气和酸解气脱气方法研究,并对其组分进行色谱和同位素分析,该方法组分含量的最大相对偏差小于10%,碳同位素值的最大绝对偏差小于1‰。对南方海相烃源岩的酸解气和吸附气的适用范围进行研究,结果表明:煤系样品不适合进行酸解气分析,吸附气的甲烷碳同位素一般不受有机质含量和碳酸盐含量的影响,酸解气的甲烷碳同位素则受有机质含量和碳酸盐含量的影响。进行气源对比应优先选用酸解气分析。运用该方法对南方海相二叠系烃源岩进行吸附气和酸解气组分碳同位素的演化模式研究,结果表明:随着演化程度的增加,吸附气和酸解气组分碳同位素逐渐变重,在过成熟阶段趋于平缓。

Degasification methods of adsorbed gas and acid decomposed gas in marine facies source rocks in South China are studied in this paper.GC and isotopes analyses of gas compositions are also done.The maximum relative deviation of composition contents is less than 10%,and the maximum absolute deviation of carbon isotopes is less than 1‰.Applications of the methods are studied.Coal samples are not fit for acid decomposed gas analyses.Methane isotopes of adsorbed gas generally will not be influenced by organic matter or carbonate contents.But for methane isotopes of acid decomposed gas,things are different.Acid decomposed gas is favorable for gas-source correlation.Evolution model studies of carbon isotopes of adsorbed gas and acid decomposed gas from marine facies Permian source rocks in South China are done,indicating that,as evolution degree increases,carbon isotopes of adsorbed gas and acid decomposed gas become heavier until over-mature stage.

国家重点基础研究发展计划(973计划)项目(2005CB22102)

https://doi.org/10.11781/sysydz200805527