The reservoir bitumen was formed and precipitated in the porosity of the reservoir rock from the oil by thermal cracking, weathering and deasphalting.

• 储层沥青对储层的储集性能有重要影响，它可以大大降低储层的孔隙度和渗透率，改变储层的孔隙结构，甚至可以完全堵塞孔隙，形成圈闭的遮挡层。