沁南煤系地层游离气与吸附气识别敏感参数  

SENSITIVE PARAMETERS OF FREE AND ABSORBED GAS IDENTIFICATIONS FOR THE COAL-MEASURE STRATA IN SOUTH QINSHUI BASIN

作　　者：孟美辰[1,2] 刘传玉[3] 王彦春[1] 

机构地区：[1]中国地质大学(北京)地球物理与信息技术学院,北京100083 [2]"地下信息探测技术与仪器"教育部重点实验室(中国地质大学),北京100083 [3]大庆油田有限责任公司钻探集团钻井三公司,黑龙江大庆163413

出　　处：《大庆石油地质与开发》2016年第3期170-174,共5页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家"十二五"油气田及煤层气科技重大专项专题"煤系地层游离气富集规律与分布研究"(2011ZX05033-004);国家高技术研究发展计划(863计划)"现代三维地震观测系统设计与多分量油气储层预测技术"(2013AA064201)

摘　　要：沁水盆地南部煤系地层的孔隙结构复杂,属低孔、低渗、非常规的薄储层,单一的弹性参数无法较好地满足煤系地层游离气和吸附气的识别。基于测井岩石物理参数,找出与游离气和吸附气关联度较高的多个敏感参数,利用敏感参数进行双参数交会分析。结果表明:泊松比和体积模量对游离气的识别最敏感,纵波阻抗和体积模量对吸附气的识别最敏感;叠前弹性参数反演得到的敏感弹性参数划分出了有利游离气勘探区和吸附气富集区。有利区与实际钻井资料吻合度较高,有效地识别游离气和吸附气,为实现煤系地层游离气与吸附气共同开采提供了新思路。Coal-measure strata in South Qinshui Basin have the characteristics of complicated pore structures;belong to the thin reservoirs with low porosity,low permeability and unconventional conditions,so the single elastic parameter can not satisfy the identifications of the free and absorbed gases in the formations.Based on the well logging petrophysical parameters,several sensitive parameters which have high correlation with the free and absorbed gases are found out.And moreover with the help of these sensitivity parameters,the two-parameter crossplot analyses are conducted.The achievements show that the Poisson's ratios and bulk modulus possess the most sensitive to the identification of the absorbed gas;the elastic parameters with the sensitivity obtained from the prestack elasticinversion can classify and detect favorable free gas exploration area and absorbed gas enrichment region.There are much high coincidence between the above favorable blocks and actual drilling data,thus two kinds of the gas stated above can be effectively identified,and moreover provide the new thought for the co-production of the free and absorbed gases in the coal measure strata.

关 键 词：游离气 吸附气 泊松比 体积模量 叠前弹性反演 

分 类 号：P618.13[天文地球—矿床学]