The major pay bed is low permeable ultra dense sandstone. Its permeability and pore throat texture are very sensitive to the net pressure of overlying strata.
主要产层为低渗透超致密砂岩，其渗透率和孔喉结构对上覆地层净压力很敏感。
2
For thin multilayer reservoirs with lowpermeability, it is expected to conduct fracturing in all pay zones at one time to reduce the frequency of fracturing operation.
对于低渗复杂的薄层多层油气藏，期望一次性压开所有产层以减少压裂作业的次数。
3
However, most of undeveloped new blocks are low-grade reservoirs with many development difficulties such as super heavy oil, lowpermeability, thin bed and deep pay.