广域电磁法在我国南方海相页岩气勘探中的应用（英文）

发布时间：2018-11-21 19:46

【摘要】：在中国页岩气勘探开发仍处于起步阶段,为了降低勘探风险和勘探成本,选择广域电磁法具有分辨率高,抗干扰能力强,勘探深度大,工作效率高等优势。我们选择湖南花垣区块叭岩向斜作为试验区,进行广域电磁法勘探。首先我们在试验区系统地采集了相关岩石标本,分析了岩石标本的电阻率和极化率参数,并针对地质条件建立了系列二维模型,以研究广域电磁法探测对不同地质结构的勘探能力,最后研究了页岩含碳量(TOC)与电阻率和极化率之间的相关性,找到了识别目标层电阻率和极化率参数的阈值,并据此划分了页岩气勘探有利区。通过在有利区内部署的钻井揭露结果表明,广域电磁法可很好地识别该地区的地下地质结构、断层,并确定目标层的分布、深度和厚度。通过对岩石的电阻率、极化率和有机碳含量三者之间的相关性分析,有助于进一步评估页岩品质并选择页岩气开发有利区。
[Abstract]:The exploration and development of shale gas in China is still in its infancy. In order to reduce the exploration risk and exploration cost, the wide area electromagnetic method has the advantages of high resolution, strong anti-interference ability, large exploration depth and high work efficiency. In this paper, we choose the Baiyan syncline of Huayuan block in Hunan as the experimental area for wide area electromagnetic exploration. First of all, we systematically collected the relevant rock samples in the experimental area, analyzed the resistivity and polarizability parameters of the rock specimens, and established a series of two-dimensional models for geological conditions. In order to study the exploration ability of wide area electromagnetic method for different geological structures, the correlation between shale carbon content (TOC) and resistivity and polarizability is studied, and the threshold to identify the resistivity and polarizability parameters of target layer is found. Based on this, the favorable areas for shale gas exploration are divided. The results of drilling exposure in the favorable area show that the wide area electromagnetic method can identify the underground geological structure, faults, and determine the distribution, depth and thickness of the target layer. Through the correlation analysis of resistivity, polarizability and organic carbon content of rock, it is helpful to further evaluate shale quality and select favorable areas for shale gas development.
【作者单位】：中国华电集团清洁能源有限公司;中南大学地球科学及信息物理学院;
【基金】：financially supported by the Thirteenth Five-Year-Plan Major Project "Marine Shale Gas Exploration and Evaluation over Laifengxianfeng and Hefeng Block"(No.2016ZX05034004-004) China Huadian Engineering Co.,LTD(No.CHEC-KJ-2014-Z10)
【分类号】：P618.13;P631.325

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