摘要
塔中地区是塔里木盆地的油气主要富集带。通过原油的中性含氮化合物的绝对浓度和相对比值,探讨了塔中4号构造C 油组和C 油组原油在垂向上和横向上的运移聚集特征。在垂向剖面上,从下亚油组到中亚油组和上亚油组,C 油组原油二甲基咔唑异构体之间的相对比值均由小变大,呈现出明显的运移分馏效应;但是同一口井的C 油组原油的运移参数却低于C 油组,表明C 油组原油不是C 油组原油直接垂向运移所致。在横向上,根据原油中性含氮化合物不同异构体之间的运移分馏效应,发现自塔中411井向塔中421井和402井方向存在着油气注入和分配现象,这就是说,在塔中4号构造C 油藏中存在着一个自东南向西北的油气注入方向;此外,在塔中4井可能还存在着另一个次要的运移方向。
The absolute amounts and relative distributions of neutral nitrogen compounds of crude oils in Tazhong field showed clearer migration fractionation vertically and laterally. From deeper reservoir to slower reservoir in C\-Ⅲ oil leg in Tazhong structure, the ratios of 1,8\|dimethylcarbazole to 1,6\|dimethylcarbazole,1,8\|dimethylcarbazole to 2,7\|dimethylcarbazole and 1,8\|dimethylcarbazole to 2,5\|dimethylcarbazole increased from 2.06,2.54,6.83 to 2.87,3.92,14.71. In contract, migration fractionation of neutral nitrogen compounds of crude oils from C\-Ⅰ oil leg and C\-Ⅲ oil leg in Tazhong field weren't obvious based on migration parameters of neutral nitrogen compounds. Crude oils of C\-Ⅰ oil leg and C\-Ⅲ oil leg in Tazhong structure migrated laterally from well TZ411 to well TZ421 and well TZ402.
出处
《天然气地球科学》
EI
CAS
CSCD
2003年第6期480-483,共4页
Natural Gas Geoscience
基金
国家"九五"重点科技攻关项目(编号:96-11-01-03-06)资助.
