辽河西部凹陷深层有效储层物性下限主控因素分析

Analysis on Main Controlling Factors of Petrophysical Parameter Cutoff in Deep Effective Reservoir in Liaohe Western Depression

辽河西部凹陷深层致密砂岩有效储层物性下限受埋藏深度、流体性质、储层特征、地层温度和压力等多因素的影响,同时也受开发工艺水平的影响。因此采用多种方法综合确定了物性下限。通过求取研究区不同深度的物性下限,结合储层性质、埋深、温度和压力等探讨影响物性下限的主控因素。储层性质、埋藏深度和地层温度是深层致密砂岩有效储层发育程度的主控因素。次生孔隙会增大有效储层孔隙度下限,物性下限随着埋深的增加而减小,随地层温度的增加有效储层物性下限降低。地层压力对有效储层发育影响较大,深部超压使有效储层物性下限降低。流体性质对储层有效性影响相对较小。

The petrophysical parameter cutoff of tight sandstone effective reservoir is not only related to the existing oil production technology level, but also affected by many other factors, such as reservoir properties, oil properties, depth, formation temperature, formation pressure and so on. So it is necessary to use a variety of methods to determine the petrophysical parameter cutoff. In this paper, combined with the reservoir properties, buried depth, temperature, pressure and many other factors, the main controlling factors to affect the petrophysical parameter cutoff were analyzed through calculating the cutoff of different depth in the study area. The results show that the main controlling factors to result in tight sandstone reservoir developing effectively are reservoir properties, buried depth and formation temperature in deep formation; Secondary porosity may increase the petrophysical parameter cutoff of deep effective reservoir, and the increase of burial depth and the increase of formation temperature can lead to the decrease of petrophysical parameter cutoff of deep effective reservoir; Formation pressure has a great impact on the development of effective reservoir, the overpressure in deep layers can lead to the decrease of the petrophysical parameter cutoff of effective reservoir. Reservoir fluid properties have a relatively small impact on the petrophysical parameter cutoff of effective reservoir.