利用宽场电磁法识别复杂构造区深层页岩气藏的电结构

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Applied Geophysics Pub Date : 2024-07-26 DOI:10.1007/s11770-024-1115-6
Zhi-Wen Gu, Yue-Gang Li, Chang-Heng Yu, Zhong-Ping Zou, Ai-Guo Hu, Xue-Bo Yin, Qinag Wang, Heng Ye, Zhang-Kun Tan
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引用次数: 0

摘要

为充分发挥大深度、高精度人工源电磁法在川南复杂构造区的技术优势,弥补常规电磁法在勘探深度、精度和准确度方面的不足,在川南罗场向斜和玉河鼻向反斜复杂构造试验区应用了大深度、高精度宽场电磁法。证明了宽场电磁法在探测深部低电阻率薄层方面的优势。首先,在物性资料分析的基础上,建立了试验区地质-地电模型,并对宽场电磁法进行了数值模拟,分析评价了深部薄页岩气层对宽场电磁曲线的响应特征。其次,在川南复杂构造区进行了宽场电磁试验。经过数据处理和反演成像,利用视电阻率测井数据进行校正,建立了适合试验区的视电阻率解释模型。在此基础上,落实了 6 千米浅层纵向地层电结构变化特征,圈定了深层页岩气层横向电分布特征。在该井附近的预测区域,后续数据验证表明,利用宽场电磁法反演得到的视电阻率与测井揭示的视电阻率变化趋势一致,证明该方法可以有效识别复杂构造区域深层页岩气层的弱响应特征。该实验表明,大深度、高精度的宽场电磁法可以有效表征复杂构造区深部低电阻率薄层的电特性,探索了一套基于宽场电磁法的页岩气目标层低成本评价新技术。
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Electrical structure identification of deep shale gas reservoir in complex structural area using wide field electromagnetic method

To fully exploit the technical advantages of the large-depth and high-precision artificial source electromagnetic method in the complex structure area of southern Sichuan and compensate for the shortcomings of the conventional electromagnetic method in exploration depth, precision, and accuracy, the large-depth and high-precision wide field electromagnetic method is applied to the complex structure test area of the Luochang syncline and Yuhe nose anticline in the southern Sichuan. The advantages of the wide field electromagnetic method in detecting deep, low-resistivity thin layers are demonstrated. First, on the basis of the analysis of physical property data, a geological–geoelectric model is established in the test area, and the wide field electromagnetic method is numerically simulated to analyze and evaluate the response characteristics of deep thin shale gas layers on wide field electromagnetic curves. Second, a wide field electromagnetic test is conducted in the complex structure area of southern Sichuan. After data processing and inversion imaging, apparent resistivity logging data are used for calibration to develop an apparent resistivity interpretation model suitable for the test area. On the basis of the results, the characteristics of the electrical structure change in the shallow longitudinal formation of 6 km are implemented, and the transverse electrical distribution characteristics of the deep shale gas layer are delineated. In the prediction area near the well, the subsequent data verification shows that the apparent resistivity obtained using the inversion of the wide field electromagnetic method is consistent with the trend of apparent resistivity revealed by logging, which proves that this method can effectively identify the weak response characteristics of deep shale gas formations in complex structural areas. This experiment, it is shown shows that the wide field electromagnetic method with a large depth and high precision can effectively characterize the electrical characteristics of deep, low-resistivity thin layers in complex structural areas, and a new set of low-cost evaluation technologies for shale gas target layers based on the wide field electromagnetic method is explored.

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来源期刊
Applied Geophysics
Applied Geophysics 地学-地球化学与地球物理
CiteScore
1.50
自引率
14.30%
发文量
912
审稿时长
2 months
期刊介绍: The journal is designed to provide an academic realm for a broad blend of academic and industry papers to promote rapid communication and exchange of ideas between Chinese and world-wide geophysicists. The publication covers the applications of geoscience, geophysics, and related disciplines in the fields of energy, resources, environment, disaster, engineering, information, military, and surveying.
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