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吸附气态烃系指沉积物中有机物质转化为烃类气体被矿物颗粒吸附的甲烷及其同系物.吸附气态烃的研究,引起了国内外学者的极大兴趣,这是因为:气态烃类有良好的迁移性能,从地下深处或油气藏向上扩散运移时,导致了近地表沉积物中烃类浓度的增高和气体组合的改变.根据高对比度的烃类异常,可以追索和指示油气藏、评价生油岩、研究油气的分布规律.近年来,我国学者利用吸附气态烃研究现代沉积物的地球化学特征及其与油气藏的关系,取得了丰富的资料和可喜的成果.作者从1974年开始,对渤海、黄海及东海表层沉积物中的吸附气态烃进行了研究,大量的实验资料表明,吸附气态烃在表层沉积物中广泛发育,绝对含量之高可与内陆还原环境下的沉积物或生油岩相媲美,并有相同的气体组合.一、吸附气态烃的分布特征
Adsorption of gaseous hydrocarbons refers to the methane and its homologs that are converted from organic matter in sediments into hydrocarbon gas and adsorbed by mineral particles. The study of adsorption of gaseous hydrocarbons has drawn great interest from domestic and foreign scholars because gaseous hydrocarbons Good migration performance, resulting from the depths of the subsurface or the uplifted migration of oil and gas reservoirs, leads to an increase in hydrocarbon concentrations and gas composition in near-surface sediments. According to high-contrast hydrocarbon anomalies, oil and gas can be traced and indicated In recent years, Chinese scholars have studied the geochemical characteristics of modern sediments and their relationship with oil and gas reservoirs by using the adsorption of gaseous hydrocarbons, and have obtained rich information and gratifying achievements. Starting from 1974, the adsorption of gaseous hydrocarbons in the surface sediments of the Bohai Sea, the Yellow Sea and the East China Sea has been studied. A large number of experimental data show that the adsorption of gaseous hydrocarbons in the surface sediments in the extensive development of high absolute content with inland reduction environment Of the sediments or oil-bearing rocks comparable to, and have the same combination of gas .A, adsorption of gaseous hydrocarbons distribution