老新油田低渗透油藏有效厚度物性下限标准研究

Study on the Lower Limit of Physical Properties in the Effective Thickness of Low-Permeability Reservoirs in Laoxin Oilfield

为了确定老新油田有效厚度物性下限,准确识别有效储层段,提高油层解释精度。根据岩心资料统计,老新油田平均孔隙度11.8%,平均渗透率10.5mD,属于低孔、低渗砂岩储层。采用测试法、岩心含油产状法、束缚水饱和度法、饱和度中值压力法、饱和度中值半径法5种方法,确定老新油田物性下限为孔隙度9.5%,渗透率2mD。研究结果为地质储量计算提供有力依据,并为后期开发评价提供了重要的参考价值。

In order to determine the lower limit of physical properties in the effective thickness of low-permeability reservoirs in Laoxin Oilfield,accurately identify effective reservoir intervals,and improve the accuracy of reservoir interpretation,statistical analysis of core data shows that the average porosity of Laoxin Oilfield is 11.8%,and the average permeability is 10.5mD,indicating a low porosity and permeability sandstone reservoir.Using five methods including testing,core oil-bearing occurrence method,bound water saturation method,median saturation pressure method,and median saturation radius method,the lower limit of physical properties of Laoxin Oilfield is determined to be a porosity of 9.5%and a permeability of 2mD.The findings provide a strong basis for geological reserve calculations and important reference for later development evaluations.