海上E区天然气水合物地质、地震、地球化学特征综合研究与成藏远景预测

AN INTEGRATED STUDY METHOD FOR EXPLORATION OF GAS HYDRATE RESERVOIRS IN MARINE AREAS

本文提出一种将地质、地震、地球化学分析相结合的方法 ,以研究海区天然气水合物的成藏条件 ,首先用物源、构造、沉积和地温等资料进行地质分析 ,确定海区天然气水合物成藏的地质条件 ;然后根据对水合物的地震属性 (BSR ,AVO ,BZ等 )分析和正演模拟研究 ,预测水合物及其游离气的存在 ,结合地质条件 ,圈定出水合物成藏的有利区带 ;最后结合对水合物主要成分 (甲烷及烃类等 )的地球化学异常分析 ,对研究区天然气水合物成藏的远景作出评价 .野外实践结果表明 ,这种综合研究方法是有效可行的 。

We propose an integrated study method for exploration of gas hydrate reservoirs in marine areas.This method combines analyses of geology,seismology,and geochemistry.First,geological analysis is made using data of material sources,structures,sediments,and geothermal regimes to determine the hydrocarbon-formation conditions of gas hydrate in marine areas.Then analyses of seismic attributes,such as BSR,AVO,and BZ as well as forward modeling are conducted to predict the potential existence of hydrate and its free gas.In conjunction with geological conditions,the hopeful zones of gas hydrate reservoirs can be estimated.Finally,based on the analysis of geochemical anomalies to the main components,such as methane and hydrocarbon series,an integrated assessment of prospective gas hydrate reservoirs in study areas can be performed.Results of field practice show that this integrated method is effective and feasible.It provides a new research approach for exploration of gas hydrate reservoirs in marine areas.