岩性油藏储层连通性及剩余油分布研究

Reservoir connectivity and residual oil distribution in lithologic reservoirs

黄珏油田戴南组为构造岩性油藏,纵向上被划分成近80个砂体,仅7个砂体储层发育规模较大,早期实现了注采完善,但不同井组见效差异较大。选取两个主力块的局部井组,静态上被认为连通性较好,但注水多年未见效。利用“对、拆、统、验”四步法手段,获得修正后的沉积微相和储层连通性认识,解决了“静态假性连通”的动静态矛盾。结合实际油藏构造形态,利用数模研究岩性油藏剩余油分布模式,为后续调整对象的选取提供依据。研究成果可为同类油藏的储层连通性研究和剩余油挖潜提供经验。

The Dainan Formation of Huangjue Oilfield is a structural lithologic reservoir.It is vertically divided into nearly 80 sand bodies,in which only 7 sand bodies have a large scale of reservoir development,and have realized the early injection production improvement,but the effects of different well groups are quite different.The local well groups of two main blocks were selected,which were considered to be good connectivity in static,but the water injection has been ineffective for many years.By using the four-step method of“pair,split,series and test”,it was obtained the modified understanding of sedimentary microfacies and reservoir connectivity,which solve the dynamic and static contradiction of“static pseudo connection”.At the same time,combined with the actual reservoir structure,the numerical simulation was used to study the distribution pattern of remaining oil in the lithologic reservoir,providing the basis for the selection of subsequent adjustment objects.The research results can provide experience for the study of reservoir connectivity and the remaining oil tapping of similar reservoirs.