摘要
页岩气是重要的非常规油气资源。通过在实验室对川黔地区的深色页岩样品进行宽频带电性参数测量发现,岩样的复电阻率的频散特性与其有机碳含量具有一定的相关性。利用双柯尔—柯尔(Cole-Cole)模型对实验数据进行反演,提取到页岩样品的零频电阻率和极化率两个主要参数。结合样品的岩矿分析结果,初步确认页岩样品中的黄铁矿微颗粒是引起深色页岩在低频段呈现高极化率异常的主要因素,而这些微黄铁矿颗粒可能与深水条件下的有机质富集有因果关系。根据深色页岩复电阻率参数的这一特征,可为利用可控源电磁勘探方法勘查页岩储层提供依据。
Shale gas is one of the important unconventional energy resources.Laboratory measurements of wide bandwidth complex electrical characteristics of dark shale samples from Sichuan and Guizhou areas have been carried out.Results show some relationship between dispersion property of complex resistivity and the total organic content(TOC)of shale samples. DC resistivity and chargeability are obtained with inversion based on double Cole-Cole models.According to the results of mineral identification,mineral type and content play an important role in electrical characteristics of shale samples,and a rudimentary knowledge is confirmed that micro-grain pyrites can mainly account for the strong polarization effect at low frequency.Based on this feature of complex resistivity of dark shale,we propose controlled source EM method for shale gas reservoir exploration.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2014年第5期1013-1019,824,共7页
Oil Geophysical Prospecting
基金
国家"973"规划项目(2013CB228605)
国家青年科学基金项目(41404087)
国家自然科学基金项目(41274082
41274115)
国家石油重大专项(2011ZX05019)
中石油创新基金项目(2013D-5006-0302)
国土资源部"全国油气资源战略选区调查与评价"项目
油气资源与勘探技术教育部重点实验室(长江大学)开放基金项目(K2013-12)等联合资助
关键词
页岩气勘探
可控源电磁法
有机碳含量
复电阻率
极化率
矿物成分
shale gas exploration,controlled source EM method,total organic content(TOC),complex resistivity,chargeability,mineral composition
