摘要
以海相、陆相页岩等温吸附测试数据为基础,探讨其等温吸附特性及与各控气因素的关系,详细论述了它们的异同之处。结果表明,海相页岩的等温吸附曲线形态变化较小,而陆相页岩明显分为2部分,即含有煤岩成分的页岩,其最大吸附量远高于海相,不含煤岩的则较低;海相、陆相页岩最大吸附量与总有机碳(TOC)、比表面积均呈正相关,另外,海相页岩与镜质组反射率(RO)、石英含量呈正相关,与黏土含量呈负相关,而陆相页岩的这一特点却不甚明显;海相页岩虽处在过成熟阶段,但最大吸附量和TOC依然呈正相关,陆相页岩的变质程度低于海相,与最大吸附量的关系呈现出2段式变化模型,RO<1.30%时,即在成熟阶段前,最大吸附量随RO值的升高而增大,RO>1.30%时,即达到成熟阶段之后,则变小。分析认为,海相、陆相页岩的沉积环境、沉积演化史及有机质类型是形成这些特征的重要因素。
Based on the measured isotherm adsorption data of marine and continental organic-rich shale,discussion has been performed on the characteristics of isotherm adsorption and its relationship with all controlling factors.The difference between them was illustrated in detail.The results are as follows.The shape of the isotherm curve of marine shale changes smoothly,while it is divided into two parts for the continental shale,i.e.shale with coals has much higher maximum adsorption than that of marine shale,and shale without coal has relatively low maximum adsorption.The maximum adsorption of marine and continental shale is positively correlated with total organic carbon（TOC）and specific surface area.In addition,the marine shale adsorption increases with vitrinite reflectance（RO）and quartz percentage in bulk composition,and decreases with clay percentage,however,these features are unclear for the continental shale.Although during the over mature stage,the maximum adsorption of marine shale is still positively correlated with TOC.with the continental shale has lower metamorphism,and the relationship between maximum adsorption and RO displays a mode of two-section type,i.e.RO 1.3%,namely before the mature stage,the maximum adsorption increases with the increase of RO;RO 1.3%,namely during the mature stage,it becomes smaller.The sedimentary environment,organic thermal evolution and type of marine and continental shale played important roles in these features.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2013年第6期1290-1297,共8页
Natural Gas Geoscience
基金
中国石油化工股份有限公司先导项目"页岩气含气量测试技术方法"(编号:34600012-11-z-zc0613-192)
中国石油化工股份有限公司华东分公司科技项目"页岩气关键试验技术研究"(编号:HDF/KJ2011-1)联合资助
关键词
海相页岩
陆相页岩
等温吸附
最大吸附量
相关性
Marine shale
Continental shale
Isotherm adsorption
Maximum adsorption
Correlation
