基于声波测井的冻土区孔隙型水合物储层水合物饱和度估算方法  

The acoustic log method of estimating gas hydrate saturation in gas hydrate reservoirs

作　　者：肖昆 邹长春[2] 卢振权 李红星[1] 秦臻 葛坤朋[1] XIAO Kun;ZOU Changchun;LU Zhenquan;LI Hongxing;QIN Zhen;GE Kunpeng(State Key Laboratory of Nuclear Resources and Environment,(East China University of Technology),Nanchang,Jiangxi,330013;Key Laboratory of Geo-detection(China University of Geosciences,Beijing),Ministry of Education,Beijing,100083;Oil&Gas Survey,China Geological Survey,Beijing,100029)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,南昌330013 [2]中国地质大学(北京)地下信息探测技术与仪器教育部重点实验室,北京100083 [3]中国地质调查局油气资源调查中心,北京100029

出　　处：《地质学报》2020年第5期1664-1674,共11页Acta Geologica Sinica

基　　金：国家自然科学基金项目(编号41804116,41674080,41964003,41804097,41764006);江西省自然科学基金项目(编号20192BAB202010,20171BAB203031)联合资助的成果。

摘　　要：水合物饱和度参数的准确计算对于水合物资源量的评价至关重要。本文提出利用超声波测井资料与等效介质模型相结合的方法,可有效评价祁连山冻土区孔隙型水合物储层水合物饱和度变化特征,并在典型孔隙型水合物钻孔DKXX-13进行了应用。基于等效介质理论的弹性波速度模型正演模拟的纵波速度相比基于双相介质理论的弹性波速度模型更加吻合实际测井纵波速度,可用于分析孔隙型水合物储层的纵波速度特征;通过正演模拟的纵波速度与实际测井纵波速度的对比,识别出X30.0~X30.2m、X30.3~X30.4m、X31.1~X31.6m、X31.7~X31.9m、X32.0~X32.2m井段存在水合物,水合物赋存井段地层的水合物饱和度变化范围为13.0%~85.0%,平均值为61.9%,与标准阿尔奇公式估算结果和现场岩芯测试结果基本一致。研究结果可为祁连山冻土区水合物地层测井评价与地震勘探提供理论依据和技术支撑。Accurate calculation of gas hydrate saturation is very important for resource evaluation.In this paper,the method of combining ultrasonic log data with the effective medium theory model has been effectively used to evaluate gas hydrate saturation characteristics of borehole formation in the Qilian Mountain permafrost.This method has been applied to the typical pore-filling gas hydrate borehole DKXX-13.The compressional wave(P-wave)velocity simulated by the effective medium theory model is more consistent with the actual log data than the velocity model based on two-phase medium theory in the pore-filling reservoir.The range of the gas hydrate saturation of the typical pore-filling reservoir in hole DKXX-13 is13.0%~85.0%,with an average value of 61.9%,which is in accordance with the results from the standard Archie equation and the actual core test.The research results could provide important reference for gas hydrate reservoir logging evaluation and seismic exploration in the Qilian Mountain permafrost.

关 键 词：祁连山冻土区 孔隙型水合物 超声波成像测井 等效介质理论 水合物饱和度 

分 类 号：P618.13[天文地球—矿床学] P631.81[天文地球—地质学]