摘要
通过对煤层气和页岩气的对称性思考,分析了煤层气与页岩气的沉积与成藏差异;总结出岩相与矿物组分特性、物性与孔隙结构特性、地化特性、含气与产气特性、地层压力与流体特性、射孔与压裂优化完井特性、测井属性等新"七性"关系测井评价方法。指出应从生、储、盖、运、圈、保的6大地质要素以及水平井地质导向、压裂检测、井筒质量检测、注入与产出监测等4大工程要素进行系统思考指导测井评价,提出以生气、排气、含气、产气的4要素测井评价目标,形成认识指导测井评价。煤层气以吸附气为主,负向构造是更有利的聚集场所。吸附气能否达到饱和、现场解吸气分析赋存机制,对认识煤层气和页岩气层以指导测井含气量评价至关重要。建议加速高精度和大尺度测井方法研究以及在现有技术条件下加强测井属性分析研究。
Based on symmetric consideration between coalbed methane and shale gas, this paper first contrast the sedimentary and reservoir mechanism differences between the two kinds of reservoirs, then put forward new seven related logging goals on rock facies and mineral composition, such as geochemistry, poro-permeability and structure, gas content and production rate, formation pressure and fluid composition, perforation and hydraulic optimization and logging attributes, etc. This paper suggest a log analyst should have an overall consideration about logging job from the six points i.e. source, reserve, cap, migration, trap, saving condition, and four points, e. g. , horizontal well geosteering, hydraulic fracturing, cased hole quality monitoring, injection and production monitoring. This paper further details the logging evaluation goal as gas formation, gas migration, gas content, gas production. Coalbed methane mainly exists in absorption form and negative trap is more favorable. Identifying absorptive gas whether to its maximum Lan^s value and using field desorption gas composition to deduce gas forming mechanism is essential to evaluate gas content and production capability. Last, this paper suggest to develop new high resolution and great scale logging tools, and to study logging attributes for present logging tools.
出处
《测井技术》
CAS
CSCD
北大核心
2013年第5期457-465,共9页
Well Logging Technology
基金
国家油气重大专项精细勘探关键技术攻关与系统配套研究(2011ZX05006-002)
国家自然科学基金数字井筒构建与声电物理属性模拟研究(No.41374124)
关键词
测井评价
煤层气
页岩气
含气量
产气量
测井属性
log evaluation, combed methane, shale gas, gas content, gas production rate, log-ging attributes
