南海南部天然气水合物稳定带厚度及资源量估算

STABLE ZONE THICKNESS AND RESOURCE ESTIMATION OF GAS HYDRATE IN SOUTHER N SOUTH CHINA SEA

为了估算南海南部天然气水合物资源量,文章分析了中外科学家的研究成果,认为南海南部具有天然气水合物形成、发育的有利条件:发育的沉积盆地、有利的水深和充足的物源供应,地震剖面揭示的BSR、泥底辟和断裂构造等印证了这一点;同时利用相关的计算公式,对南海南部4个重点区域的水合物稳定带厚度进行了计算,并在此基础上对南海南部的水合物资源前景进行了预测.结果表明,4 个研究区域内的绝大部分海域具有天然气水合物形成的温度、压力条件,水合物稳定带厚度67～833 m.各个海域差异较大,南海南部水合物体积及甲烷资源量分别为2.32×1013m3和4.78×1015m3.

According to the widely distributive sediment ary basins, favourable water depth and sufficient matter supply as well as the B SR, mud diapires and fault structure revealed by seismic sections, it was indica ted that there exist advantageous conditions of gas hydrate formation and enrich ment in Southern South China Sea. On the basis of calculating the stable zone th ick of gas hydrate in four key blocks of Southern South China Sea by applying re levant formulae, the prospects for gas hydrate resources in the sea were predict ed by the authors. Through prediction it was shown that most of the offshore are as in the selected blocks are possessed of the temperature and pressure conditio ns of gas hydrate formation; the stable zone thicknesses of gas hydrate range fr om 67 m to 833 m, so that there is a great difference among different blocks; an d the gas hydrate volume and resources in Southern South China Sea are 23.2×10  12 m3 and 4.78×10 15 m3 respectively.