应用产能模拟技术确定储层基质孔、渗下限

采用WS-2000全模拟岩心综合测试系统，在全模拟条件下研究了四川盆地和鄂尔多斯盆地碎屑岩油、气藏在弹性开采过程中，产量和模拟生产压差的关系，得到了日产气（油）量与储层岩石物性呈正相关关系，在模拟生产压差范围内，单井产量随生产压差增大而增大的认识；根据工业产油（气）井的产量标准，应用产能模拟资料确定：鄂尔多斯盆地P₁x₈储层孔隙度下限为5%，渗透率下限为0.4×10^-3μm²；四川盆地J₃p储层孔隙度下限为6.7%，渗透率下限为0.4×10^-3μm²，T₃x²产层孔隙度和渗透率下限分别为3.3%和0.045×10^-3μm²；J₂s油藏的孔隙度下限为2.7%，而渗透率下限则为0.24×10^-3μm²。其中除T₃x²气藏外，其余油气藏下限值均已被生产证实。

DETERMINING THE POROSITY AND PERMEABILITY LOWER LIMITS OF RESERVOIR MATRIX BY PRODUCTIVITY SIMULATION TECHNIQUE

In order to determine porosity and permeability lower limits of reservoir matrix, the relationship between productivity and drawdown pressure under whole simulation conditions in elastic exploitation process of the clastic oil gas reservoirs in Sichuan and Shanganning basins is studied in this paper by using the core synthetic testing system WS 2000. The result shows that daily production is positively correlated with petrophysical properties and single well production increases with drawdown pressure within the simulation drawdown pressure. According to the commercial production standard, the lower limits of petrophysical properties determined by the data of productivity simulation are that the porosity and permeability cutoffs of H8 are 5% and 0.4×10－3μm2 in Shanganning Basin; in Sichuan Basin, J3p reservoir is 6.7% and 0.4×10－3μm2, T3x2 producing formation is 3.3% and 0.045×10－3μm2; Jsl oil reservoir is 2.7% and 0.24×10－3μm2. All of the limits except T3x2 have been proved by productions.