摘要
页岩气为源岩区油气聚集,属于源岩滞留气,以游离和吸附状态为主存在。富有机质页岩含气量是页岩气资源评价和有利区优选的关键参数。页岩有机质含量和地层的压力、温度、湿度等因素影响页岩的含气量。含气量的确定方法主要有解吸和测井方法。开展页岩气地质评价,除含气量参数外,还要研究地层和构造特征、岩石和矿物成分、储层厚度和埋深、储集空间类型、储集物性、岩石力学参数、有机地球化学参数、区域现今应力场特征、流体压力、储层温度、流体饱和度、流体性质等其它参数。发展有效的系统集成方法,综合分析、评价页岩气资源潜力和预测有利区,目前也在不断探索之中。
Shale gas is one kind of natural gas that has been generated but remained in source rocks at the state of free or absorbed. The shale gas content is the key factor for shale gas assessment and core area evaluation. There are several factors of shale layers that affect the shale gas content, including TOC, Ro, pressure, temperature and moisture. Well site, laboratory, and mathematical techniques used to determine absorbed gas content, and well logs are used to determine free gas content. Evaluation of shale gas reservoirs need even more factors, the factors in the aspects of shale geologic factors such as thickness and depth, rock type and lithologic composition, microfacies and organic geochemistry factors; reservoir factors such as porosity, permeability, rock mechanics factors and sensitive factors; absorbed gas content, free gas content, total gas content, etc. Development of an effective system integration approach, comprehensive analysis, evaluation of shale gas resource potential and prediction of favorable areas are constandy being explored currendy.
出处
《地质通报》
CAS
CSCD
北大核心
2011年第2期308-317,共10页
Geological Bulletin of China
基金
国土资源部油气专项<中国重点地区页岩气资源潜力及有利区优选>(编号:2009GYXQ15)
关键词
页岩气
含气量
保存条件
评价参数
地质评价
有利区优选
shale gas
shale gas content
preservation condition
evaluation parameters
geological evaluation
favorable area optimization
