全直径岩心孔渗分析技术

Porosity and permeability analysis of full diameter core

全直径岩心分析是从储集层中取出整段岩心进行物性分析检测。由于特殊的非均质储集层在溶孔、裂缝发育段进行取样时,尤其是在大溶孔、网状缝或延伸大的裂缝处取小岩样时易于破碎,所取岩样往往不能准确反映某深度点整个井眼的孔隙发育情况;而且,对孔隙欠发育且连通性较差的严重非均质地层,小岩样往往仅反映微小的局部地层,不能反映所对应深度的真实情况。为此,开展了全直径岩心分析技术的研究,详细介绍孔隙度、渗透率监测分析原理以及测量实验的操作步骤,进行了全直径岩心孔隙度、垂向和侧向渗透率、克氏渗透率的实验。经实例效果检验结果表明,通过全直径岩心分析获得的孔隙度、渗透率数据更合理准确,可提高缝洞、溶洞型非均质储集层物性参数的精度,从而为非均质储集层的油气层开发提供更为可靠的依据。

Whole core analysis is removing a whole section of core from reservoir to carry out physical properties analysis and detection.For the special heterogeneous reservoirs,sampling in solutional voids and fracture-developed intervals,especially in the layer voids,mesh fracture or the large extension of cracks,small core samples are fragile to break,so the core samples can not accurately reflect the real situation of pore development corresponding depth.For the reservoirs with underdevelopment and poor communication of pores,their heterogeneity is very strong,the small core samples can only reflect the tiny local stratigraphy,and can not fully reflect the real situation of the corresponding depth.For this reason,a study was made for whole core analysis,which gave a detailed introduction to the detecting and analysis principles of porosity,permeability as well as measuring experiment steps.The authors did full diameter core' s porosity,vertical and lateral permeability and the Klinkenberg permeability experiments.The results from the tested samples indicated the porosity and permeability which were obtained from the full diameter core analysis were more reasonable and accurate,can improve the accuracy of physical parameters of heterogeneous reservoirs with fracure,vuggy and cave,and provide a more reliable basis for the development of oil and gas layers in non-homogeneous reservoirs.