鄂尔多斯盆地蟠龙油田长2储层物性主控因素分析

通过对蟠龙油田长2砂岩的岩石学特征、孔隙类型、成岩作用及储层物性研究,其储层物性主要受沉积微相、成岩作用、裂缝发育程度与规模控制。辫状河河道砂坝中细—细砂岩具有较高的孔隙度和渗透率,天然堤粉细砂岩和细砂岩的孔隙度和渗透率较低;压实作用是导致砂岩孔隙丧失的主要原因;碳结作用进一步破坏孔隙度,碳酸盐是砂岩孔隙度丧失的主要胶结物;溶解作用是物性得到改善的重要途径;裂缝对砂岩渗透率的提高起了重要贡献。

Major factors controlling reservoir-quality of Chang 2 Reservoir in Panlong oilfield,Ordos Basin

Detailed studies on sedimentary micro-facies,pore-type,diagenesis and reservoir quality show that the reservoir quality is strongly controlled by the depositional micro-facies,diagenesis,development and dimension of fractures of sandstones.The medium to coarser-grained and fine-grained sandstones in the braided facies are of high porosity and permeability;while sandstones with fine grained and very fine-grained in the meandering micro-facies are of relatively lower porosity and permeability.The mechanical c...