Analytic techniques of the light hydrocarbon and the carbon isotope of natural gases were employed to cast light on the natural gas origin of shallow gas reservoirs and the migration characteristics,and the origin of the gas hydrate proved in the north of the South China Sea,in combination with the regional geology and gas hydrate data.The result indicates that the natural gas from shallow reservoirs is a mixture of biogenic gas and thermal genetic gas.It reveals that the potential gas source for gas hydrate was not limited to biogenic gas,but the biodegradation gas and thermal genetic gas have great contribution to the gas hydrate.The thermal genetic gas in the mixture gases is from deep hydrocarbon reservoirs,which indicates that the gas hydrate maybe has a close relationship with the regular deep hydrocarbon reservoirs.It can be concluded that two types of gas hydrates originated from biogenic gas and mixture gas exit in Shenhu deep zone of continental margin in the north of the South China Sea.The deep zone of Baiyun Sag in Pearl River Mouth basin will be the most valuable target for gas hydrate exploration in this area.
运用南海北部珠江口盆地白云凹陷实际勘探的地质、地球化学资料,对该区天然气水合物的气源条件、气源成因和运移通道进行了分析和探讨.结果表明,盆地内巨厚的古近系-新近系烃源岩及第四系富有机质沉积岩可生产大量的热成因气和细菌成因生物气,为天然气水合物的形成提供了大量的气源;盆地内断裂和底辟构造发育,把热成因气源源不断从深部运移到浅层,与生物气混合,在浅层形成了两个重要的气源区:生物气区和混合气区,这两种成因气是该区天然气水合物的主要气源.天然气水合物的气源与深部油气藏的气源成因有密切的关系,珠江口盆地白云凹陷深水区为南海北部水合物最具潜力的勘探区.
使用超高真空磁控溅射系统在p—Si上制备了铂铱硅（PtxIr1-xSi）薄膜，并制作了PtxIr1-xSi／p-Si红外探测器，研究了探测器在3～5btm波段的特性，结果表明，PtxIr1-xSi／p-Si势垒高度为0．177eV，相应红外探测器截止波长为7．0μm。与普通铂硅红外探测器相比，铂铱硅红外探测器在3～5μm中波红外波段响应明显增强。
Ultra thin Pt_xIr_(1-x)Si films were deposited on p-Si substrates with ultra high vacuum sputtering system and Pt_xIr_(1-x)Si /p-Si(100) Schottky barrier detectors were fabricated and the characteristics of the detectors operating in the wavelength range of 3 ～ 5 μm were studied, with the barrier height of 177 meV and cutoff wavelength of 7. 0 μm. compared with ordinary Pt-Si IR detectors, Pt_xIr_(1-x)Si detectors have a much higher response at 3～5 μm MWIR spectral range.
