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在低电阻率油气层的识别与评价中,常规测井遇到了巨大的挑战。由于低电阻率油气层的电阻率与围岩电阻率接近,油气层特征不明显,需要发展测井新技术。研究表明,全波列测井的纵横波速度比、泊松比、体积压缩系数和能量衰减对气层很敏感;核磁共振测井T2谱能很好地识别油水层;电缆地层测试求得的视流体密度可直接反应流体性质。南海西部海域油气勘探实践证明:利用常规测井技术与全波列测井、核磁共振测井和电缆地层测试等测井新技术综合判断低电阻率油气层,取得了很好的效果。
In the identification and evaluation of low resistivity reservoirs, conventional logging encounters great challenges. Due to the resistivity of low resistivity oil and gas layers is close to the resistivity of the surrounding rock, the characteristics of oil and gas reservoirs are not obvious, and new logging technologies need to be developed. The results show that the P-wave velocity ratio, Poisson’s ratio, volumetric compressibility and energy decay are sensitive to the gas layer in full-wave well logging. The T2 spectrum of nuclear magnetic resonance logging can well identify the oil-water layer. The apparent fluid density directly reflects the fluid properties. The practice of oil and gas exploration in the western South China Sea has proved that good results have been obtained by comprehensively judging low resistivity oil and gas reservoirs by using conventional well logging techniques and new logging technologies such as full wave array logging, nuclear magnetic resonance logging and cable formation testing.