Saturation evaluation for fine-grained sediments

作     者：Linqi Zhu Shiguo Wu Xueqing Zhou Jianchao Cai Linqi Zhu;Shiguo Wu;Xueqing Zhou;Jianchao Cai

作者机构：Key Laboratory of Marine Geophysics and GeoresourceInstitute of Deep-sea Science and EngineeringChinese Academy of SciencesSanya 572000China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519000China University of Chinese Academy of SciencesBeijing 100049China Sanya Institute of Deep-sea Science and EngineeringChinese Academy of SciencesSanya 572000China State Key Laboratory of Petroleum Resources and ProspectingChina University of PetroleumBeijing 102249China 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2023年第14卷第4期

页      面：57-71页

核心收录：

学科分类：08[工学] 0708[理学-地球物理学] 0815[工学-水利工程] 

基　　金：This project was funded by the National Natural Science Foundation of China(No.42106213) the China Postdoctoral Science Foundation(Nos.2021M690161 and 2021T140691) the National Key Research and Development Program of China(No.2021YFC3100601) the Postdoctorate Funded Project in Hainan Province 

主　　题：Hydrate Fine-grained Cementation factor Saturation index Archie Petrophysics 

摘      要：Accurate quantification of the gas hydrate content in the deep sea is useful for assessing the resource potential and understanding the role of gas hydrates in the global carbon *** logging data combined with Archie’s equation are often used to calculate gas hydrate saturation,but the reliability is dependent on the rationality of the empirical parameter cementation factor and saturation *** present,an increasing number of fine-grained hydrate-rich sediment regions have been discovered worldwide through drilling efforts,and the reservoir types and hydrate distribution are diverse,which differs greatly from that of coarse-grained reservoirs of hydrate-bearing *** results in vertical variations in m and n through *** present,the saturation evaluation effect of these reservoirs cannot be *** this work,a theory for the determination of the cementation factor and saturation index was first proposed to obtain reliable and variable values of the empirical ***,a hydrate saturation evaluation technique with variables m and n was formed based on the well logging *** technique was used to evaluate complex fine-grained hydrate-bearing reservoirs in several regions *** was found that the highest n could be 16,and the log calculation results were more consistent with the core hydrate ***,the cause of the excessively high n values was explained from physical principles,and the result was verified with actually well log *** future evaluations of the amount of hydrate resources in fine-grained sediment reservoirs worldwide,new saturation estimation methods should be taken into account to advance hydrate research.