断裂系统对碳酸盐岩油气聚集的控制作用:以塔北隆起轮古东油气田为例

综合利用岩心、测井、试油及薄片等资料分析了轮古东奥陶系断裂对储层的改造作用,探讨了断裂与奥陶系碳酸盐岩油气富集程度的关系。研究表明,轮古东奥陶系碳酸盐岩基质孔隙不发育,孔洞缝及其组合为主要储集空间,断裂及伴生裂缝有效地改造了碳酸盐岩储集层,断裂发育形成的裂缝及断裂破碎带控制和促进了岩溶作用的发生,在断裂附近碳酸盐岩孔洞更发育,断裂带附近2 km内易形成高渗透带,高角度裂缝对碳酸盐岩孔洞的形成更为有效。EW向和SN向断裂是油气垂向运移的有效通道,控制着平面上和垂向上气油比、天然气产能及相态的变化。断裂控制着碳酸盐岩孔洞、洞穴、裂缝空间组合分布的多样性和差异性及油气富集的非均质性,断裂带附近高角度裂缝及孔洞较发育,油气产能较高,在远离断裂部位油气的聚集效率低,持续活动的走滑断层附近是油气最为富集的区域,因此,轮古东奥陶系具有纵向上多层系含油气、平面上分区分带的特征。     

北欧海深层水的研究进展简

As a connection region between North Atlantic and Arctic Oceans, the Nordic Sea plays a critical role in global climate system. In the Nordic Seas, surface water converts into intermediate water and deep water after cooling and other effects. These waters transport southward, and enter into North Atlantic as a form of overflow, therefore, they are the main source of the North Atlantic Deep Water(NADW), which play a key role in global ocean conveyor. The causes and processes of the deep water formation in the Nordic Seas are still uncertain. Based on a review of current and historical research results of the deep water in the Nordic Seas, the most important process for deep water formation convection is addressed. Factors and physical processes that may have impact on deep water formation are summarized. The transport of deep water in the Nordic Seas is summed up. Multi year variation of the deep water is described with the aim of giving some instructions and research directions to the readers.