物性与孔喉结构对致密砂岩储层含油性的影响

——以鄂尔多斯盆地华池—合水地区长7段为例

Influence of physical property and pore throat structure on oiliness of tight sandstone reservoir:Taking Chang 7 oil-bearing formation in Huachi-Heshui Area of Ordos Basin as an example

唐海评 陈世加 张潇文 黄囿霖 姚宜同

西南石油大学地球科学与技术学院，四川 成都 610500

School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China

华池—合水地区已钻井中广泛存在同段砂体含油性好、含油性差或不含油互层的现象。以显微荧光确定的含油性为基础，并结合物性和压汞参数，研究储层物性与孔喉结构对含油性的影响。结果表明：物性对储层含油性的控制作用明显，物性好的储层含油性好，物性差的储层含油性差或不含油；储层含油饱和度随孔隙度的增大呈线性增加，随渗透率增大呈指数增大；含油性较好的样品孔喉较粗，排替压力较小；反之，孔喉的大小决定原油能否进入，且明显影响含油饱和度大小，孔喉分选控制原油富集程度。

The phenomenon that good oil-bearing sandstones interbedded with poor oil-bearing or non-oil-bearing sandstones in the same sand body of a well widely exists in drilled wells in Huachi-Heshui Area. Based on the oiliness of reservoir determined by micro-fluorescence and in combination with the physical properties and mercury injection parameters, this paper studies the influence of physical property and pore throat structure on the oiliness of reservoir. The results show that reservoir physical property has a significant controlling role on the oiliness of reservoir. The reservoir with good physical property has good oiliness and the reservoir with poor physical property has poor oiliness, or free of oil. The oil saturation of reservoir increases linearly with the increase of reservoir porosity and increases exponential with the increase of reservoir permeability. The pore throat of the sample with good oiliness is big and the displacement pressure is low. Whereas the pore throat of the sample with poor oiliness is small. The size of pore throat determines whether the oil can enter into or not. The enrichment degree of oil is controlled by sorting. The oil saturation of reservoir is obviously influenced by the size of pore throat.

10.6056/dkyqt201502013