APPLICATION OF NON-HYDROCARBON TECHNIQUE TO CHARGING PATTERN IN E31 POOL, GASIKULE OILFIELD, QAIDAM BASIN
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摘要: 通过对尕斯库勒E31油藏原油中性含氮非烃化合物的分析, 确认吡咯类化合物的油气运移效应显著.研究表明, E31油藏的主要油气注入点在背斜油藏的东北端, 西侧翼为其次要的油气注入点.推测尕斯库勒背斜油藏东北方向的茫崖凹陷为其主要的油源区, 尕斯断陷仅提供少部分油气.E31油藏的形成机制有其特定的地质条件, 侧上式和断接式为其主要的成藏模式.Abstract: The detection of pyrrolic nitrogen compounds in oils of Gasikule oilfield, Qaidam basin, western China reveals apparent migration effects of pyrrolic nitrogen compounds in the oils, indicating that the main charging points of Gasikule oilfield of lower anticline pool (E31) are on the two sides of the anticline along the direction of the short axis, especially along the right side of the anticline. The main migration directions of oil redistribution range from the middle of the anticline to the two sides of the long axis. Most oils are supposed to come from Manya sag in the northeast of the pool, and only minority of oils, accumulated in the southwest of the anticlinal pool, are supposed to come from Gasi sag itself. The geological background of this area determines the oil migration and accumulation patterns, further indicating that disconformity and fracture are the two major paths for the oil migration.
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Key words:
- pyrrolic nitrogen compound /
- oil migration /
- pool pattern /
- Gasikule oilfield
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图 1 尕斯库勒油田区域位置
1.一级构造单元界线; 2.亚一级构造单元界线; 3.逆断层; 4.老山边界; 5.尕斯油田位置.ⅠA.赛北断陷亚区; ⅠB.大红沟隆起亚区; ⅠC.鱼卡红山断陷亚区; ⅠD.德令哈断陷亚区; ⅡA.一里坪坳陷亚区; ⅡB.大红山隆起亚区; ⅡC.茫崖坳陷亚区; ⅡD.尕斯断陷亚区; ⅡE.昆北断阶带; ⅢA.盐湖斜坡; ⅢB.三湖坳陷亚区; ⅢC.格尔木斜坡带
Fig. 1. Location of Gasikule oilfield
图 2 吡咯类化合物丰度变化显示分馏效应
1.井位; 2.咔唑; 3.甲基咔唑; 4.三甲基咔唑; 5.苯并[a]、[c]-咔唑
Fig. 2. Abundance of pyrrolic compounds in oil decreases with increasing oil migration distance
图 4 咔唑与硅表面氢氧基团反应形成氢键示意
C-1、C-8位都被烷基取代的异构体为屏蔽型异构体; C-1、C-8位仅有一个被烷基取代的异构体为半屏蔽型异构体; C-1、C-8都未被取代的异构体为暴露型异构体
Fig. 4. Illustration of hydrogen bond between carbazole and hydroxyl
图 5 原油中C2-、C3-咔唑三类异构体相对丰度的变化
1.屏蔽型; 2.半屏蔽型; 3.暴露型
Fig. 5. Relative abundance of C2-, C3-carbazoles'isomers indicating direction of oil migration
图 6 尕斯库勒油田E31油藏油气运移模式
a.侧上式运移; b.断接式运移
Fig. 6. Oil accumulation patterns of Gasikule oilfield
表 1 尕斯库勒原油(E31) 甾、萜烷分子地球化学参数
Table 1. Parameters of steranes and terpenoids in oil of Gasikule oilfield
表 2 尕斯库勒原油吡咯类化合物基本参数
Table 2. Parameters of pyrrolic nitrogen compounds in oil
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