火山岩储层天然气运聚成藏模拟:以徐家围子断陷深层为例  

Gas Migration and Accumulation Modelling in Volcanic Reservoirs,Xujiaweizi Fault Depression,Songliao Basin

作　　者：王民 卢双舫 王文广 陈树民[2] 张曦[3] 关莹 

机构地区：[1]中国石油大学非常规油气与新能源研究院,山东青岛266580 [2]中国石油大庆油田公司勘探开发研究院,黑龙江大庆163712 [3]新南威尔士大学

出　　处：《地球科学（中国地质大学学报）》2017年第3期397-409,共13页Earth Science-Journal of China University of Geosciences

基　　金：国家重点基础研究发展计划(973计划)(No.2009CB219306);山东省优秀中青年科学家科研奖励基金项目(No.BS2014HZ001)

摘　　要：与火山岩有关的油气藏或油气显示已在世界范围内被广泛发现,然而受火山岩储层强非均质性的影响,揭示火山岩油气成藏过程的盆地模拟研究进展十分缓慢,尚未见到关于火山岩储层中油气运聚成藏模拟研究的报道.采用PetroMod软件首次成功模拟了火山岩储层天然气运聚成藏过程,系统论述了含油气盆地模拟工作中三维精细地质模型的建立、关键参数的选取,并在统计国内外火山岩物性的基础上提出了不同岩性火山岩孔隙度与深度的关系,结合研究区岩相分布,考察了不同断裂活动期和不同运移算法时深层火山岩天然气运聚过程.结果揭示:徐家围子断陷深层有机质具有接力生气的特征,无主生气期,火山岩气藏主要形成于泉头组-青山口组末期,气藏发育位置受控于断裂分布与活动期、火山岩体和储层孔隙度;活动期次与时间可影响天然气聚集层位,深层气源断裂活动期要早于94.5Ma;采用混合法模拟火山岩储层中的油气运聚成藏比较合适.徐家围子断陷深层火山岩天然气的下一步勘探方向为斜坡带、洼陷深部的微幅度构造、火山岩体和岩性尖灭带,同时深层致密砂砾岩储层也应有较大潜力.Volcanic reservoirs and oil ＆ gas shows have been found worldwide. However, the modelling of volcanic rocks relat- ed hydrocarbon accumulation process shows little progress due to strong volcanic reservoir heterogeneity. Using PetroMod soft- ware, gas migration and accumulation in the volcanic reservoirs has been successfully modelled for the first time in this study. Three dimensional geological modelling, key parameters or methods selection are described in detail. Based on the statistical po- rosity of volcanic rocks, the relationship of porosity versus depth for volcanic rocks was established using an exponential mod- el, then the gas migration and accumulation processes under different situations, such as fault activity periods and flow simula- tion methods, were modelled. The results show that gas generation from organic matter in the study area has a long period in a relay mode without major gas generation period; volcanic gas reservoirs formed mainly during Quantou Qingshankou Forma- tion end period, and gas reservoir distributions were controlled by fault locations, activity periods, volcanic rock mass and po- rosities; the fault activity time is before 94.5 Ma indicated by simulation results. It is concluded that the integrated migration method is the best way for describing gas migration in the volcanic rocks. Slope zone, micro-structures in the sag, lithologic pinchout and volcanic mass are favorable zones for the volcanic gas exploration in the study area, meanwhile, the tight con- glomerate or tight sand in the deep formation should also have a great potential for gas exploration.

关 键 词：运聚模拟 关键参数 天然气 火山岩 徐家围子断陷 石油地质． 

分 类 号：P618.13[天文地球—矿床学]