塔里木盆地轮古东油气相态和饱和度特征及其主控因素分析  

Analysis of main controlling factors for hydrocarbon phases and saturation in eastern Lungu area,Tarim Basin

作　　者：吴萧[1,2] 韩杰[2] 朱永峰[2] 刘俊锋[2] 

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《天然气地球科学》2016年第1期30-40,共11页Natural Gas Geoscience

基　　金：国家重大科技专项(编号:2011ZX05049)资助

摘　　要：轮古东是气侵改造型油气藏,具有"气干油重"的性质,通过PVT相态研究发现,其油气相态和饱和度平面上表现为自东南向西北呈现未饱和气藏—饱和气藏—饱和油藏的趋势,垂向上的相态变化不大,但是部分井出现了上部为未饱和气藏,下部为饱和气藏的特征,这种分布特点主要受到气侵强度差异、复杂的油气运聚过程、断裂以及盖层的控制。通过分析轮古东油气藏的相态及饱和度的分布规律,发现本区距离气源的位置比构造聚集天然气的控制作用更强。认为本区东部的吉拉克地区三叠系在喜马拉雅早期由于盖层条件不佳导致聚集的油气发生散失,在库车组快速沉积时期又由于隔层的出现导致了三叠系气侵不彻底,根据轮古东奥陶系的油气相态和饱和度特征预测吉拉克地区奥陶系和石炭系仍有相当资源量的未饱和凝析气藏,为吉拉克地区海相油气的勘探提供了科学依据。As gas wash affecting oil and gas reservoir,Lungu east reservoir in the Luntai Uplift is characterized by “Dry gas,Heavy oil” property,and its oil and gas phases and saturation show a regional trend from unsaturated gas reservoir,saturated gas reservoir,to saturated oil reservoir from southeast to northwest through the PVT phases analysis.The oil and gas phases have little changes vertically.However,some wells were featured by unsaturated gas reservoir in the upper intervals,while saturated gas reservoir in the lower intervals,which was mainly controlled by the intensity of gas wash,complicated oil and gas accumulation process,fracture and cap rocks.Based on the analysis of Lungu east oil and gas phases,distribution and main controlling factors of oil and gas saturation in the Lungu east area,we observed that the favorable gas accumulation in this area is adjacent to source kitchen.It is concluded that the oils of Triassic reservoir in Jilake area leaked due to the unfavorable sealing conditions in Himalayan movement.Limited gas washing occurred in Triassic oil reservoir for the occurrence of barrier layers,which were resulted from rapid subsidence of Kuqa Formation.We predict that the Jilake field still has an abundance of unsaturation reserves in Ordovician and Caboniferous,based on the analysis of Lungu east oil and gas phases and saturation characters,which is very significant for the exploration of Jilake offshore area.

关 键 词：凝析气藏 相态 饱和度 主控因素 气侵 轮古东 

分 类 号：TE122.2[石油与天然气工程—油气勘探]