Gas Sources and Mixing Ratio of Ordovician Weathering Crust Reservoir of Central Gas Field in Ordos Basin
-
摘要: 对鄂尔多斯盆地中部气田天然气碳同位素资料按不同地区、不同层位进行了分析,认为奥陶系风化壳气藏甲烷碳同位素值与石炭—二叠系气藏的接近,在平面上变化趋势相似,而与风化壳之下奥陶系自生自储的油型气相差较大。奥陶系风化壳气藏的来源是以石炭—二叠系煤成气为主,定量计算表明,在中部气田的大部分地区,石炭—二叠系来源气的比例大于70%。Abstract: According to the distribution of the carbon isotopic composition data of over 140 gas samples in dif-ferent places and different beds in Ordos basin, natural gas in the Ordovician weathering crust is more close to the Carbo niferous-Permian coal-typed gas rather than to the Ordovician oil-typed gas represent-ed by the gas in the reservoir under the weathering crust. Plenary distribution of methane carbon isotopic composition of weathering crust gas has a similar feature with that of Carboniferous-Permian gas. Calcu-lation result shows that over 70% of the gas in weathering crust in the Central gas field is from Car-boniferous-Permian beds.
-
Key words:
- Ordos Basin /
- gas source /
- methane /
- carbon isotope /
- mixing-ratio
-
[1] .戴金量, 宋岩, 张厚福等. 中国天然气的聚集区带. 北京: 科学出版社, 1997. 57~67 [2] .徐永昌. 天然气成因理论及应用. 北京: 科学出版社, 1994. 185 [3] .陈安定. 陕甘宁盆地中部气田奥陶系天然气的成因及运移. 石油学报, 1994, 15(2): 1~10 [4] .黄第藩, 熊传武, 杨俊杰等. 鄂尔多斯盆地中部气田气源判识和天然气成因类型. 天然气工业, 1996, 16(6): 1~5 [5] .关德师, 张文正, 裴戈. 鄂尔多斯盆地中部气田奥陶系产层的油气源. 石油与天然气地质, 1993, 14(3): 191~199 [6] .张士亚. 鄂尔多斯盆地天然气气源及其勘探方向. 天然气工业, 1994, 14(3): 1~4 [7] .戴金星, 裴锡古, 戚厚发主编. 中国天然气地质学 (卷二). 北京: 石油工业出版社, 1996. 32~33 [8] .张义纲, 章复康, 郑朝阳. 识别天然气的碳同位素方法. 见: 有机地球化学论文集, 北京: 地质出版社, 1987 [9] .杨俊杰, 裴锡古. 中国天然气地质学 (卷四). 北京: 石油工业出版社, 1996. 111 -

计量
- 文章访问数: 469
- HTML全文浏览量: 13
- PDF下载量: 508
- 被引次数: 0