复电阻率法在安徽南陵盆地海相页岩气勘探中的应用

doi:10.11720/wtyht.2022.1336

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摘要

安徽南陵盆地主体为中生代陆相红盆,红盆下海相地层分布不明,页岩气资源潜力不清。根据本区周边二叠系富有机质泥页岩储层含有黄铁矿的物性特征,选用复电阻率法开展页岩气地质调查工作。针对盆内、盆外不同地质特点设计合适的观测系统,采用Cole-Brown和Cole-Cole模型拟合反演,绘制近区场电磁电阻率和视充电率参数图。研究结果发现:①研究区二叠系富有机质泥页岩碳质含量高、富含黄铁矿颗粒,具有明显的“低电阻率、高极化率”特征,可以有效与其围岩区分,有利于开展复电阻率法勘探;②极化率是识别深部富有机质泥页岩地层乃至页岩气藏的有效参数;③根据复电阻率法勘探结果,实施钻孔验证,成功钻遇三叠系灰岩地层,并预测南陵盆地红盆下为二叠系页岩气藏有利区。本次研究表明了复电阻率法在南陵盆地可探测深达2 000 m以下累计厚度约200 m的含黄铁矿泥页岩地层,是电磁法勘探中唯一能直接指示页岩气藏的方法,可以适用于地质情况复杂的南陵盆地乃至中国南方海相页岩气地球物理勘探。本次勘探结果也为在南陵盆地进一步开展海相页岩气勘探提供了依据。

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关键词 ：复电阻率法, 南陵盆地, 南方海相地区, 富有机质页岩, 页岩气勘探

Abstract：

The main part of the Nanling Basin in Anhui Province is a red Mesozoic continental basin, under which the distribution of marine strata is still undetermined and the potential of shale gas resources is unidentified. Based on the physical property characteristics that the Permian organic-rich shale reservoirs around the study area contain pyrite, this study carried out a geological survey of shale gas using the complex resistivity method. Specifically, this study designed an observation system suitable for the different geological characteristics inside and outside the basin, conducted fitting and inversion using Cole-Brown and Cole-Cole models, and plotted maps of near-field parameters electromagnetic resistivity and apparent charging rate. The results show that: (1) The Permian organic-rich shale contains high carbonaceous content and rich pyrite particles and has distinct characteristics of low resistivity and high polarizabi-lity. Therefore, it can be effectively distinguished from its surrounding rocks, which is favorable for the shale gas exploration using the complex resistivity method; (2) Polarizability is an effective parameter that can be used to identify deep organic-rich shale strata and even shale gas reservoirs; (3) Drilling tests were carried out based on the exploration results obtained using the complex resistivity method, successfully discovering the Triassic carbonate strata and predicting that below the red basin in the Nanling Basin is the favorable area of Permian shale gas reservoirs. This study demonstrates that the complex resistivity method can detect pyrite-bearing shale strata with a depth of greater than 2,000 m and a cumulative thickness of about 200 m in the Nanling Basin and is the only method that can directly indicate shale gas reservoirs in electromagnetic exploration. Therefore, the complex resistivity method can be applied to the geophysical prospecting of the marine shale gas in the Nanling Basin with complex geological conditions and even Southern China. The results of this exploration also provide a basis for the further exploration of the marine shale gas in the Nanling Basin.

Key words： complex resistivity method Nanling Basin marine shale in South China organic-rich shale shale gas geophysical prospecting

收稿日期: 2021-06-10 修回日期: 2022-01-15 出版日期: 2022-06-20

ZTFLH:

P631.1

基金资助:中国地质调查局项目“苏皖地区页岩气地质调查”(DD20190083);“下扬子地区油气页岩气调查评价”(DD20221662)

作者简介: 殷启春(1977-),男,高级工程师;2010年毕业于中国科学院研究生院,主要从事地球物理勘探研究和非常规油气勘探评价工作。Email: yinqc@mail.cgs.gov.cn

引用本文:

殷启春, 王元俊, 周道容, 张丽, 孙桐. 复电阻率法在安徽南陵盆地海相页岩气勘探中的应用[J]. 物探与化探, 2022, 46(3): 668-677.
YIN Qi-Chun, WANG Yuan-Jun, ZHOU Dao-Rong, ZHANG Li, SUN Tong. Application of complex resistivity method to the exploration of marine shale gas in the Nanling Basin, Anhui Province. Geophysical and Geochemical Exploration, 2022, 46(3): 668-677.

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https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2022.1336 或 https://www.wutanyuhuatan.com/CN/Y2022/V46/I3/668

Fig.1 南陵盆地CR法测点分布

Fig.2 皖南地区二叠系泥页岩中黄铁矿分布照片

Fig.3 WYD1井电阻率测井曲线

Table 1 研究区地层综合电性分层统计

Fig.4 仪器与观测系统配置

Fig.5 CR法数据处理流程

Fig.6 CR法反演电磁电阻率(a)、充电率(b)断面及地质解释

Fig.7 泾页1井周边反演电阻率剖面(a)及反演充电率剖面(b)

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