低渗致密气藏密闭取心含水饱和度校正——以东海盆地西湖凹陷花港组储集层为例  

Water Saturation Correction Through Sealed Coring in Low-Permeability Tight Gas Reservoirs:A Case Study from Huagang Formation in Xihu Sag,East China Sea Basin

作　　者：付焱鑫 FU Yanxin(Petroleum Research Institute,Shanghai Branch,CNOOC China Limited,Shanghai 200335,China)

机构地区：[1]中海石油(中国)有限公司上海分公司研究院,上海200335

出　　处：《新疆石油地质》2018年第6期713-716,共4页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2016ZX05027-002)

摘　　要：东海盆地西湖凹陷低渗致密气藏含气饱和度评价一直是困扰勘探开发评价的难点。压汞等常规岩心分析方法难以准确确定含气饱和度,与常规岩心分析相比,密闭取心测量的含水饱和度更接近地层真实情况,但是也存在水挥发的问题。为了准确刻度含气饱和度,分析了密闭取心岩心分析含水饱和度的主要影响因素,对比了3种岩心处理方法的不同,提出了考虑岩石孔隙形变的基于低渗致密气藏密闭取心挥发量实验的含水饱和度校正方法,完成了西湖凹陷某构造5井密闭取心饱和度校正,总校正量10%左右。结果表明,该方法简便实用,适用于东海西湖凹陷低渗致密气藏密闭取心饱和度校正。In Xihu sag of East China Sea basin, the gas saturation evaluation for low-permeability tight gas reservoirs is always the key difficulty in exploration and development. The conventional core analysis method such as mercury injection is difficult to get accurate gas saturation of low-permeability tight gas reservoirs. Compared with conventional core analysis, the measured water saturation through sealed coring is more approaching to the actual situation. But water volatilization is a problem. In order to accurately calibrate the gas saturation, the paper analyzes the main factors influencing the water saturation through sealed coring, compares 3 core treatment methods, proposes a new water saturation correction method considering the distortion of rock pores and based on the experiment of sealed-coring volatile quantity of low-permeability tight gas reservoirs, and performs water saturation correction through sealed coring in WELL-5 in Xihu sag with the total correction of about 10%. The results show that the new correction method is simple and practical, which is suitable for the sealed coring saturation correction for low-permeability tight gas reservoirs in Xihu sag of East China Sea basin.

关 键 词：东海盆地 西湖凹陷 低渗致密气藏 密闭取心 饱和度校正 孔隙形变 挥发实验 

分 类 号：TE125[石油与天然气工程—油气勘探] TE37