石油地球物理勘探2023，Vol.58Issue(6)：1410-1422,13.DOI:10.13810/j.cnki.issn.1000-7210.2023.06.013
厚层低渗气藏"甜点"预测
Sweet spot prediction in thick gas reservoirs with low permeability in Huagang Formation of Z gasfield in Xihu Sag,East China Sea Shelf Basin
摘要
Abstract
The Xihu Sag of the East China Sea Shelf Basin is an area with great potential for exploring thick gas reservoirs with low permeability.The prediction of sweet spots is the key to the development of the reservoir.How-ever,it is difficult to predict sweet spots of thick reservoirs with strong heterogeneity.The geophysical prediction technology and methods of different types of sweet spots are established for offshore thick gas reservoirs with low permeability.Firstly,based on the classification of sweet spots,rock physics and seismic forward modeling analyses are carried out to clarify the sensitive rock physics parameters and seismic response characteristics of sweet spots.Then,the appropriate pre-stack elastic inversion methods are selected to predict the spatial distribution of different types of sweet spots.The research results show that sweet spots of class I can be well characterized by direct inver-sion of P-wave modulus,and sweet spots of class Ⅱ can be well characterized by pseudo P-and S-wave velocity ratio inversion.The predicted thickness of the sweet spot before drilling is highly consistent with the actual drilling thick-ness of the development well.In addition,the coincidence rate of the sweet spot of class Ⅰ is more than 80％,and that of class Ⅱ is more than 70％.In conclusion,the method for sweet spot prediction is effective and highly accurate,and it has certain reference significance in the development of similar gas fields.关键词
低渗储层/厚层/"甜点"预测/敏感弹性参数/叠前反演Key words
reservoir with low permeability/thick reservoir/sweet spot prediction/sensitive elastic parameters/pre stack inversion分类
地质学引用本文复制引用
何贤科,娄敏,涂齐催,李炳颖,蔡华..厚层低渗气藏"甜点"预测[J].石油地球物理勘探,2023,58(6):1410-1422,13.基金项目
本项研究受国家自然科学基金项目"东海深层低渗—致密气储层体系质量差异性成因机制及演化模式"(U19B2006)、中海石油(中国)有限公司上海分公司生产科研项目"Z气田H3b气藏开发机理及合理配产研究"(E-Y423RD01)和国家科技重大专项"东海厚层非均质性大型气田有效开发关键技术"(2016ZX05027-004)联合资助. （U19B2006）
