混油钻井液影响地层含油性的实时发现与准确评价，色谱、质谱、光谱等扣除背景值的识别方法定量精度较低，一维核磁共振方法需要在添加弛豫试剂前、后进行2次分析，为此采用T₁-T₂二维核磁共振测量方法，通过对混油钻井液、不同矿化度盐水及3种成品油、5种原油的测试，建立了混油钻井液中的水、基础油、地层油的解释图版；通过对混油钻井液均匀混入不同含量原油后的测试，建立了混油钻井液中的地层油含量评价模型；通过不同质量白油的测试，确定了T₁-T₂的检测下限为200 ~ 750 mg/L。经实验模拟及实钻验证，所建立的解释图版和评价模型可靠。因此，T₁-T₂二维核磁共振能够直接、直观区分混油钻井液中的基础油和地层油，实现地层含油性的及时发现与直观识别。

The real-time discovery and accurate evaluation of oil-bearing properties of formation are affected by oil-emulsion drilling fluid. However, the quantitative accuracy of identification methods such as chromatography, mass spectrometry and spectrum without background value is low. One-dimensional T₂ nuclear magnetic resonance (NMR) method requires two analyses before and after the addition of relaxation reagents. For this reason, two-dimensional NMR T₁-T₂ method was adopted to test the oil-emulsion drilling fluid, brine with different salinity, three types of refined oil and five types of crude oil, and the interpretation chart of water, base oil and formation oil in the oil-emulsion drilling fluid was established. The evaluation model of formation oil content in the oil-emulsion drilling fluid was established by testing the oil-emulsion drilling fluid with different crude oil content. The lower detection limit of T₁-T₂ method was determined to be 200 ~ 750 mg/L by the test of white oil with different qualities. The interpretation chart and evaluation model were proved to be reliable by experimental simulation and actual drilling. Therefore, two-dimensional NMR T₁-T₂ maps can easily and clearly distinguish base oil and formation oil in oil-emulsion drilling fluid, and help realize the timely discovery and visual identification of oil-bearing properties of formation.