塔河地区古近系低阻碎屑岩储层岩石物理特征及经济性评价研究
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金芫
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烟台职业学院，山东烟台，264670
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摘要：本研究针对塔河地区古近系弱固结、岩性复杂、非均质性强的低电阻率储层，针对其低阻成因不清、测井系列不全导致评价准确性受限等核心问题，开展了系统的岩石物理实验、测井数值模拟与经济性评价。基于岩心CT 扫描、XRD、核磁共振等实验，揭示了黏土附加导电和高束缚水饱和度是导致储层低阻的主要地质成因。通过构建基于BO-Catboost 优化集成学习的岩性识别模型，有效提升了复杂岩性的判识精度。结合阵列感应测井二维/三维正演模拟，开发了“井眼-侵入”一体化校正方法，实现了地层真电阻率的准确求取。进一步优化了三孔段饱和度模型，建立了融合电阻率、核磁、声波等多参数的流体识别图版。经济性评价表明，在当前技术成本和市场条件下，该储层直接进行大规模商业开发的经济性较差，静态投资回收期长，净现值为负，但其经济性对天然气价格和单井产量高度敏感。未来需通过地质-工程一体化技术攻关，实现“降本增效”，方能把握开发机遇。研究成果为塔河地区低阻复杂储层的测井精细解释与开发决策提供了关键技术支撑。
关健词：低电阻率储层；岩石物理；阵列感应测井；经济评价；塔河地区 |
Rock Physical Characteristics and Economic Evaluation of Low-Resistivity Clastic Reservoirs in the Paleogene of Tahe Area
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Yan Jin
Yantai Vocational College，Yantai Shandong 264670，China
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Abstract：This study focuses on the Paleogene low-resistivity reservoirs in the Tahe area, characterized by weak consolidation, complex lithology, and strong heterogeneity. To address the core issues of unclear mechanisms causing low resistivity and limited evaluation accuracy due to incomplete well logging suites, systematic rock physics experiments, well logging numerical simulations, and economic evaluations were conducted. Based on core CT scanning, XRD, nuclear magnetic resonance (NMR) and other experiments, it was revealed that clay additional conductivity and high irreducible water saturation are the primary geological causes of the low resistivity in the reservoirs. A lithology identification model based on BO-Catboost optimized ensemble learning was developed, effectively improving the accuracy of identifying complex lithologies. By incorporating 2D/3D forward modeling of array induction logging, an integrated "borehole-invasion" correction method was developed to accurately determine the true formation resistivity. Furthermore, a three-porosity-component saturation model was optimized, and a fluid identification crossplot integrating multiple parameters such as resistivity, NMR, and acoustic data was established. Economic evaluation indicates that under current technical costs and market conditions, large-scale commercial development of these reservoirs is economically unfavorable, characterized by a long static payback period and a negative net present value. However, the economics are highly sensitive to natural gas prices and single-well production rates. Future development opportunities rely on geological-engineering integrated technological breakthroughs to achieve "cost reduction and efficiency enhancement." The research findings provide key technical support for fine well log interpretation and development decision-making of low-resistivity complex reservoirs in the Tahe area.
Keywords : Low-resistivity reservoirs；Rock physics；Array induction logging；Economic evaluation；Tahe area
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