冀中北部天然气测井识别技术

Application of natural gas logging identification technology in north Jizhong region

随着天然气市场需求的不断增加,冀中北部天然气勘探开发工作力度不断加大,对天然气层测井识剐与评价技术提出了新的要求。鉴于常规的三孔隙度测井曲线重叠及中子伽马时间推移测井在识别常规砂岩天然气层存在的局限性,提出了常规三孔隙度测井及中子伽马时间推移测井识别天然气层的适应条件;针对冀中北部地区砾岩、碳酸盐岩潜山及深层砂岩低孔低渗储层天然气层测井识别存在的难题,研究应用偶极横渡、核磁共振、核磁扫描、模块式地层测试等新技术测井识别气层技术。研究表明,常规三孔隙度及中予伽马时间推移测井,由于受岩性等方面影响存在多解性,而核磁扫描测井、模块式地层测试等新技术在天然气层识别方面具有明显优势。

In recent years,with the increasing demand for natural gas,gas exploration and development efforts in north Jizhong region continue to increase,which puts forward new requirements for logging identification and evaluation technique in the gas layers.Given the limitations of overlapped curve of three-porosity logging and neutron-gamma over time logging in natural gas layer identification,the adaptive conditions of these two logging modes were proposed.Because of problems in the gas pay identification of conglomerate,carbonate rocks buried hill and deep sandstone reservoirs with low porosity and permeability in north Jizhong region,new logging techniques for gas pay identification were studied and applied,such as dipole shear wave log,nuclear magnetic resonance,nuclear magnetic scanning,modular formation testing.Results show that conventional three neutron porosity and gamma over time logging have multiple solutions because of the lithology effect.On the contrast,nuclear magnetic scanning and modular formation testing have obvious advantages in the gas layer recognition.