川南海相页岩成熟度与电性特征关系分析  

Analysis of the relation between the maturity and electrical properties of marine shale in south of Sichuan

作　　者：汤家林 张明明[1] TANG Jialin;ZHANG Mingming(Key Lab.of Earth Exploration&Information Techniques of Ministry of Education,Chengdu University of Technology,Chengdu Sichuan 610059,China)

机构地区：[1]成都理工大学地球勘探与信息技术教育部重点实验室,四川成都610059

出　　处：《油气地球物理》2018年第2期66-69,共4页Petroleum Geophysics

基　　金：国家自然科学重点基金资助项目"基于地震电磁属性的页岩气储层预测与监测方法研究"(U1262206)

摘　　要：电阻率测井已经成为页岩气测井中不可缺少的一种方法,有机质碳化以及页岩的形成环境均会导致电阻率测井方法在评估总有机碳含量(TOC)上出现偏差。针对页岩成熟度对页岩气测井电阻率的影响,采用X衍射、有机地化测试及岩石学参数测试等手段,建立了页岩成熟度与电性特征关系。研究结果表明,川南龙马溪组海相页岩具有超高的成熟度,当页岩TOC>1.5%时,页岩沉积为强水动力条件,页岩成熟度随TOC含量的升高而升高;页岩的碳化现象导致电阻率降低,TOC与电阻率呈明显的负相关关系。研究结果为川南龙马溪组海相页岩气电阻率测井和电磁法勘探提供了实验数据支持。The resistivity log has become an indispensable method in the shale gas log.The organic carbonaceous formation and shale formation environment will cause the deviation of in assessing TOC content with the resistivity log method.In view of the impact of the shale maturity on the resistivity of the shale gas log,the X-ray diffraction,organic geochemical testing and petrology parameter testing are used to establish the relation of the shale maturity and electrical characteristics.The results show that the marine shale of the Longmaxi Formation of the south of Sichuan has an extremely high level of the maturity.When the TOC of the shale is above 1.5%and the shale sedimented under strong hydrodynamic conditions,the shale maturity increases along with the increase of TOC content.The carbonization of shale results in a decrease in resistivity,with a significant negative correlation between the TOC and the resistivity.The results provide experimental data for the marine shale gas resistivity log and electromagnetic exploration in the Longmaxi Formation of the south of Sichuan.

关 键 词：海相页岩 成熟度 电性特征 龙马溪组 

分 类 号：TE122[石油与天然气工程—油气勘探]