摘要
在调研了国内外页岩气研究成果的基础上,系统地研究了页岩气藏基本特征,分析了页岩气藏的成藏机理及成藏控制因素,并针对页岩气藏特殊的成藏特征,探讨了相应的识别方法和资源评价方法。研究表明,页岩气藏通常具有自生自储、储层粒度细、低孔低渗、裂缝发育、储层面积大、连续分布、形成温度及埋深范围广,赋存方式主要为吸附态、压力异常、产能低、采收率低和生产周期长等特征;页岩气成藏具有过渡特点,兼具了根缘气及常规天然气的成藏机理;有机质类型及含量、成熟度、裂缝、孔隙度和渗透率、矿物组成、厚度、湿度、埋深、温度与压力对页岩气藏的形成具有一定的控制作用;利用岩心分析法、地球物理法及ECS测井、成像测井等测井新技术可定性或定量识别页岩气;按照页岩气资源评价主要方法的原理归类,目前页岩气资源评价主要方法有类比法、成因法、统计法和综合法4类,每种方法有各自的适用性和局限性。
Based on the investigation of shale gas at home and abroad,this article systematically studies the basic characteristics of shale gas reservoir, analyzes formation mechanism of shale gas reservoir and its con- trolling factors. In addition, it discusses the matching identification method and resource assessment meth- ods aiming at the shale gas reservoir＇s special accumulation characteristics. Studies show that shale gas res- ervoir generally has characteristics such as self-generation and self-storage, fine particle size, low porosity and low permeability, fracture development, big reservoir area, continuous distribution, wide formation tem- perature and burial depth, abnormal formation pressure, low capacity, low recovery ratio, long production period and its occurrence mode is mainly adsorption state. Shale gas reservoir formation has transitional characteristic,with reservoir formation mechanism of both source-contacting gas and conventional natural gas. The type, content and maturity of organic matters, the fracture, porosity and permeability, mineral composition, thickness, humidity, burial depth of shale, as well as the temperature and pressure have certain controlling effect on the formation of shale gas reservoir. Shale gas can be identified qualitatively or quanti- tatively with core analysis method, geophysical method and new logging techniques such as ECS logging and imaging logging. According to the difference of principles, there are mainly four shale gas resource as- sessment methods for different geological and data conditions, which are analogy method, statistic method, genetic method,comprehensive analytical method.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2013年第3期429-438,共10页
Natural Gas Geoscience
基金
国土资源部"十二五"重点项目"重要矿产资源保障能力综合评价"(编号:1212011088033)资助
关键词
页岩气
地质特征
成藏机理
页岩气识别
资源评价方法
Shale gas
Geological feature
Reservoir forming mechanism
Shale gas identification
Resourceassessment methods
