琼东南盆地天然气水合物储层参数测井评价及分析

Logging evaluation and analysis of reservoir parameter for natural gas hydrate in Qiongdongnan Basin

马通 祝鹏 陈鸣 葛阳 焦红梅 魏微

成都理工大学能源学院，四川 成都 610059 中海石油（中国）有限公司湛江分公司，广东 湛江 524000 中海油研究总院有限责任公司，北京 100028 天然气水合物国家重点实验室，北京 100028

College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China Zhanjiang Branch of CNOOC Ltd., Zhanjiang 524000, China CNOOC Research Institute Co., Ltd., Beijing 100028, China State Key Laboratory of Natural Gas Hydrates, Beijing 100028, China

天然气水合物作为一种新型非常规清洁能源，绿色无污染，是世界各国在能源领域研究的重点。文中基于等效介质理论分析了南海天然气水合物储层类型空间分布模式，同时采用多种方法开展储层孔隙度和水合物饱和度预测工作。采用威利方程法、密度￣核磁共振联合法对储层孔隙度进行预测，预测结果较好。采用Wood法、含泥质修正的电阻率法、时间平均方程法和等效介质法对水合物饱和度进行预测，结果表明：当水合物饱和度为20%~40%时，含泥质修正的电阻率法和等效介质法的预测值与实测值最吻合，时间平均方程法的预测值大于实测值，Wood法的预测值略低于实测值；当水合物饱和度小于10%时，只有含泥质修正的电阻率法的预测值与实测值最接近。通过分析不同预测方法的适用性及评价效果，为琼东南盆地天然气水合物的精细研究及储层参数评价提供了参考和依据。

As a new type of unconventional clean energy, natural gas hydrate is green and pollution-free, which is the focus of research in the field of energy in the world. Based on the effective medium theory, this paper analyzes the spatial distribution model of natural gas hydrate reservoir types in the South China Sea, and uses a variety of methods to predict the porosity and saturation of natural gas hydrate reservoirs. The porosity was predicted preferably by using Wyllie equation and Density-NMR method. Wood equation, resistivity method with muddy modification, time average equation and effective medium method were used to predict saturation of natural gas hydrate. The results show that when the saturation is 20%￣40%, the predicted value of resistivity method with muddy modification and effective medium method have the best agreement with the actual value. The predicted value of time average equation is greater than the actual value, and that of Wood equation is slightly lower than the actual value. At low saturation(＜10%), only resistivity method with muddy modification predicted the closest trend with the actual value. By analyzing the applicability and evaluation effect of different prediction methods, the reference methods and theoretical basis are provided for the detailed investigation of natural gas hydrate and the evaluation of reservoir parameters in Qiongdongnan Basin.

10.6056/dkyqt202302010