利用非烃技术探讨尕斯库勒油田E3^1油藏的充注模式

APPLICATION OF NON-HYDROCARBON TECHNIQUE TO CHARGING PATTERN IN E_3~1 POOL, GASIKULE OILFIELD, QAIDAM BASIN

通过对尕斯库勒E13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 ,E13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 .E13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 .

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 (E 1 3) 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.