南海神狐海域天然气水合物储层参数定量评价方法  

A Quantitative Evaluation Method for the Natural Gas Hydrate Reservoir Parameters in the Shenhu Area,South China Sea

作　　者：康冬菊 刘俊东 李海燕 屈翠侠 陆敬安[1] 谢莹峰 钟超 任金峰 KANG Dongju;LIU Jundong;LI Haiyan;QU Cuixia;LU Jingan;XIE Yingfeng;ZHONG Chao;REN Jinfeng(Guangzhou Marine Geological Survey,China Geological Survey,Guangzhou,Guangdong 510760,China;Tianjin Branch of China National Logging Corporation,Tianjin 300280,China)

机构地区：[1]中国地质调查局广州海洋地质调查局,广东广州510760 [2]中国石油集团测井有限公司天津分公司,天津300280

出　　处：《现代地质》2024年第2期385-397,共13页Geoscience

基　　金：广东省重点领域研发计划资助项目(2020B1111030003)。

摘　　要：海洋型天然气水合物以固态形式赋存于尚未固结的泥质粉砂和粉砂质泥地层中,不同于常规油气藏在固结砂岩地层中的赋存模式,因此造成水合物储层测井评价的难题。2007年以来我国南海神狐地区实施了4次水合物钻探,取得丰富的地球物理与岩心资料并且证实该区存在着巨大的天然气水合物资源潜力。本文通过对神狐地区常规测井、特殊测井资料以及取心资料的研究分析,总结水合物地层各项测井响应特征,利用岩心数据刻度测井,建立储层岩性、物性以及水合物饱和度计算模型,形成一套适合神狐地区天然气水合物储层参数的定量评价技术。利用本文方法对研究区部分井进行综合评价,水合物地层孔隙度平均为49.91%,水合物饱和度平均为29.75%,孔隙结构以小孔隙为主,渗透性较差,评价结果与岩心实验结果基本一致,符合率达85%。该研究成果为神狐海域水合物资源量评价及成藏研究提供了新的参考。Marine gas hydrate exists in the unconsolidated argillaceous silt and silty mud formations in a solid state.It is completely different from the occurrence of conventional oil and gas reservoirs,which are consolida-ted sandstone formations.Therefore,the logging evaluation of hydrate reservoirs is more challenging than the conventional ones.Since 2007,four hydrate drillings have been carried out in the Shenhu area of South China Sea.Abundant geophysical and core data have been obtained and it has been confirmed that there is a huge potential for natural gas hydrate resources in this area.In this study,starting from the research and analysis of conventional logging,special logging data,and core data in Shenhu,we summarized the logging response characteristics of hydrate formation.The core data were used to calibrate logging.At the end,the calculation model of reservoir lithology,physical properties,and hydrate saturation is established.Consequently,a set of quantitative evaluation system for natural gas hydrate reservoir parameters in the Shenhu area is proposed.The proposed method in this study was used to evaluate the wells comprehensively.The average porosity of hydrate formation is 49.91%,and the average hydrate saturation is 29.75%.The pore structure is mainly small pores and the permeability is poor.The evaluation results are consistent with the core experimental results with a coincidence rate of 85%.The research results provide a new reference for the evaluation of hydrate resources and accumulation in the Shenhu area.

关 键 词：天然气水合物 测井响应特征 储层参数计算 定量评价 

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