徐家围子深层气田天然气甲烷碳同位素动力学分析  

Carbon isotope kinetics analysis of natural gas methane for deep zone gas field in Xujiaweizi area

作　　者：徐立恒[1] 陈践发[1] 卢双舫[2] 黄世鹏[1] 郑小杰[3] 

机构地区：[1]中国石油大学资源与信息学院,北京102249 [2]大庆石油学院地球科学学院,黑龙江大庆163318 [3]长安大学地球科学与资源学院,陕西西安710054

出　　处：《中国石油大学学报（自然科学版）》2009年第3期39-44,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(40572079);大庆油田有限责任公司勘探开发研究院项目(4100376)

摘　　要：采用压力下黄金管封闭体系生烃模拟试验和以CramerⅢ模型为核心的碳同位素动力学软件，获取松辽盆地徐家围子断陷沙河子组泥岩和煤生成甲烷的碳同位素动力学参数，结合地质背景进一步探讨徐家围子深层天然气的气源、生气期、运聚成藏模式等。研究结果表明：沙河子组煤系地层（泥岩及煤）主要生烃（甲烷）期在100～73Ma年前，相当于泉头组沉积末期至四方台组沉积期；徐深1井营城组地层天然气甲烷碳同位素值与泥岩成甲烷、煤成甲烷的累积碳同位素值很接近，反映出该气藏与沙河子组煤系地层具有亲缘性，且气藏属于长期聚集而成。By using hydrocarbon-forming simulation test in gold tube close system under pressure and carbon isatope kinetics software depended on CramerⅢ model, carbon isotope kinetics parameters of methane produced from coal and mudstone in Shahezi formation of Xujiaweizi fault depression, Songliao Basin were obtained. And the origin, gas-generating period and migratory concentration pattern of hydrocarbon reservoir for deep zone gas field in Xujiaweizi were discussed on the basis of geologic background. The results show that main hydrocarbon-forming time of Shahezi coal formation（ coal and mudstone） is before 100 -73 Ma, which is between the last stage of Quantou formation deposit and Sifangtai formation deposit. Natural gas methane carbon isotope value of Xusheu 1 well Yingcheng formation is close to the accumulative carbon isotope value of methane derived from coal and methane derived from mudstone, which reflects that this gas pool has familiarity with Shahezi coal formation, and this gas pool formed for long-term accumulation.

关 键 词：徐家围子地区 甲烷 模拟试验 同位素动力学 CramerⅢ模型 

分 类 号：TE626.642[石油与天然气工程—油气加工工程]