南苏丹Melut盆地Ruman凹陷东斜坡稠油成藏机理及勘探潜力分析

Analysis of Heavy Oil Accumulation Mechanism and Exploration Potential in the Eastern Slope of Ruman Sag in Melut Basin,South Sudan

针对南苏丹Melut盆地Ruman凹陷稠油油藏成藏机理及勘探潜力认识不清的问题,运用烃源岩盆地模拟、油藏分析等研究方法,对Ruman凹陷东斜坡稠油油藏成藏机理进行研究,并对该区稠油的勘探潜力进行分析。研究结果表明:Ruman凹陷东斜坡Yabus组、Gayger组与基岩油藏受Lau组沉积时期构造运动影响,原生油藏发生破坏,现今为次生型残留稠油油藏,勘探潜力十分有限;Jimidi组油藏为晚期成藏次生型稠油油藏,有利勘探面积约为21 km 2,Galhak组油藏属于晚期成藏原生型稠油油藏,有利勘探面积约为105 km 2,均具有较大勘探潜力。该研究可为研究区下步油气勘探提供一定的借鉴和指导。

Aiming at the problem of unclear understanding of the reservoir-forming mechanism and exploration potential of heavy oil reservoirs in the Ruman sag of the Melut Basin in South Sudan,the reservoir-forming mechanism of heavy oil reservoirs in the eastern slope of the Ruman sag was studied by using research methods such as source rock basin modeling and reservoir analysis,and the exploration potential of heavy oil in this area was analyzed.The results show that the primary reservoirs of the Yabus Formation,Gayger Formation and bedrock reservoirs in the eastern slope of the Ruman sag were destroyed due to the tectonic movement during the sedimentary period of the Lau Formation,and have become secondary residual heavy oil reservoirs,thus they have very limited exploration potential.The oil reservoir in the Jimidi Formation is a secondary heavy oil reservoir with late accumulation and favorable exploration area of about 21 km 2.The oil reservoir in the Galhak Formation belongs to a primary heavy oil reservoir with late accumulation and favorable exploration area of about 105 km 2.They both have larger exploration potential.This study can provide some reference and guidance for the next oil and gas exploration in the study area.