广域电磁法识别深层边水气藏纵横向水侵前缘的应用探索

doi:10.13809/j.cnki.cn32-1825/te.2025114

摘要/Abstract

摘要： 中国深层/超深层天然气资源丰富,累计探明天然气地质储量近5×10¹² m³,累计天然气产量超过5 000×10⁸m³,该领域是保障国家能源安全的重要战略领域。然而,深层/超深层气藏均为有水气藏且普遍采用稀井网开发模式,在此条件下,水侵前缘准确刻画难度大,成为制约深层/超深层有水气藏高效开发的关键因素。研究结合广域电磁法可通过反演电阻率差异区分气区、气水过渡区、水区的优势,以四川盆地磨溪龙王庙组气藏1井组为研究对象,开展了2 km²的三维广域电磁探测,获取了地下5 000 m的地电特征,形成一套震电融合的流体识别方法,构建了地电模型,首次实现了广域电磁法对深层边水气藏纵横向水侵前缘的识别。研究结果表明：基于测井电阻率与广域反演电阻率的线性回归,得到1井组水区的广域电磁法反演电阻率小于227 Ω·m,气水过渡区的广域电磁法反演电阻率介于227~383 Ω·m,纯气区的广域电磁法反演电阻率大于383 Ω·m;边水自1号井向气藏内部均匀推进,未发现优势水侵通道,水侵前缘呈非均匀状,整体侵进速率约50 m/a;井组宜采取排控结合的治水对策,1号井排水量介于300~400 m³/d,内部气井产气规模由200×10⁴ m³/d降至150×10⁴ m³/d以下。该成果在深层/超深层气藏气水分布描述、水侵前缘刻画和精细治水等方面具有广阔应用前景。

关键词: 广域电磁法, 深层边水气藏, 电阻率, 水侵前缘, 治水对策

Abstract: China is rich in deep and ultra-deep natural gas resources. The cumulative proven geological reserves of natural gas are nearly 5×10¹² m³, and the cumulative natural gas production exceeds 5 000 ×10⁸ m³. It is an important strategic field for ensuring national energy security. However, deep and ultra-deep gas reservoirs are all water-bearing gas reservoirs and are generally developed using sparse well patterns. Under the condition of sparse well pattern development, it is difficult to accurately depict the leading edge of water invasion, which has become a key factor restricting the efficient development of deep/ultra-deep water-bearing gas reservoirs. This study leveraged the advantages of the wide field electromagnetic method that could distinguish gas zones, gas-water transition zones, and water zones through differences in inversion resistivity. Taking well group 1 of the Longwangmiao Formation gas reservoir, Moxi area, Sichuan Basin as the research object, a three-dimensional wide field electromagnetic detection of 2 km² was conducted. The geoelectric characteristics from 5 000 m underground were obtained, a set of fluid identification methods integrating vibration and electricity was formed, and a geoelectric model was constructed. The wide field electromagnetic method was used for the first time to identify the leading edge of water invasion in deep edge-water gas reservoirs. The results showed that: (1) based on the linear regression relationship between well-logging resistivity and the wide field inversion resistivity, it was determined that the wide field electromagnetic inversion resistivity in the water zones of well group 1 was less than 227 Ω·m, the wide field electromagnetic inversion resistivity in the gas-water transition zones ranged from 227 Ω·m to 383 Ω·m, and the wide field electromagnetic inversion resistivity in the pure gas zones was greater than 383 Ω·m. (2) The edge water advanced relatively uniformly from well 1 into the interior of the gas reservoir without obvious water invasion channels. The leading edge of the water invasion showed uneven water invasion characteristics, with an overall water invasion rate of approximately 50 m/a. (3) The well group should adopt a water control strategy combining drainage and control. The daily drainage capacity of well 1 was 300 to 400 m³/d, and the daily gas production capacity of the internal wells should be reduced from the current 200×10⁴ m³/d to below 150×10⁴ m³/d. This achievement has broad application prospects in the description of gas-water distribution in deep/ultra-deep gas reservoirs, the characterization of the leading edge of water invasion, and precise water control.

Key words: wide field electromagnetic method, deep edge-water gas reservoir, resistivity, water invasion front, water control strategy

中图分类号:

TE332

张连进,李滔,唐松, 等. 广域电磁法识别深层边水气藏纵横向水侵前缘的应用探索[J]. 油气藏评价与开发, 0, (): 20251112-20251113.

ZHANG LIANJIN,LI TAO,TANG SONG, et al. Application exploration of wide field electromagnetic method for identification of longitudinal and lateral water intrusion fronts of deep edge-water gas reservoirs[J]. Petroleum Reservoir Evaluation and Development, 0, (): 20251112-20251113.

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