| 摘要: |
| 为解决扬子地区页岩气勘探开发中出现的储层异常低电阻现象,提高测井评价的准确性,研究页岩气储层低阻的形成原因及机制。首先对低阻页岩气储层的地质及测井响应特征分析,结合岩心资料,完善页岩气储层低电阻率的成因;然后通过对扬子地区页岩气储层测井资料的处理,分析储层低阻的成因机制。结果表明,造成页岩储层低阻主要包括6个因素:较高黏土含量,过成熟有机质,高黄铁矿含量,高地层水矿化度,发育差的储层物性及优良的地质条件。实际地层的低阻成因是由于多种因素共同作用的结果,而且不同地区、不同储层影响因素不同,需要分析相应地质、测井及岩心资料,利用邻井对比和上下层段对比的方法判断储层低阻的主要成因,有利于准确识别含气层段,提高测井解释评价的精确度。 |
| 关键词: 页岩气 电阻率测井 低阻页岩 测井评价 |
| DOI：10.3969/j.issn.1673-5005.2018.05.005 |
| 分类号::TE 122.24 |
| 文献标识码:A |
| 基金项目:国家自然科学基金项目(41574122);国家科技重大专项(2017ZX05036-005-003) |
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| Mechanism analysis and logging evaluation of low resistivity in lower Paleozoic shale gas reservoirs of Yangtze region |
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SUN Jianmeng, XIONG Zhu, LUO Hong, ZHANG Hongpan, ZHU Jinjiang
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(School of Geosciences in China University of Petroleum(East China), Qingdao 266580, China)
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| Abstract: |
| To resolve the problem of abnormal low resistivity in shale gas reservoirs in the process of shale gas exploration and development in Yangtze region, and to improve the accuracy of logging evaluation, the formation mechanisms of low resistivity of shale gas reservoirs are studied. Firstly, through the analysis of geology and logging response characteristics of low resistivity shale gas reservoirs, in combination with core data, the causes of low resistivity are inferred. Then, using the actual shale gas reservoir logging data obtained in Yangtze region, the causes of the low resistivity are analyzed. The mechanisms of low resistivity include six factors:high clay content, over-mature organic matter, high pyrite content, high degree mineralization of water, poor development of reservoir properties and excellent geological conditions. These factors intervene with each other, and work together. In different regions and reservoirs, the main controlling factors are different. By comparing adjacent wells and differences in the upper and lower intervals, it helps to identify the main causes of the low resistivity and to improve the accuracy of logging interpretation evaluation. |
| Key words: shale gas resistivity logging low resistivity shale logging evaluation |
