【摘要】 天然气水合物是一种具有巨大潜能的新型非常规能源资源 ,其对常规油气藏可起到很好的封盖作用。以国内外天然气水合物的研究成果和进展为基础 ,通过讨论天然气水合物的形成机制、演化特征以及其分布规律 ,系统分析了天然气水合物可以得天独厚地封盖油气藏的机理 ,探讨了其对油气藏尤其是气藏聚集和保存的控制作用 ,提出了天然气水合物聚集和保存油气的多类地质模式 ,如垂向遮挡和侧向遮挡、披覆遮挡和接触遮挡以及同生遮挡和后生遮挡等。虽然目前我国国土和领海范围内现存的天然气水合物资源可能较少 ,但应重视古天然气水合物对于现今沉积盆地内油气藏的重要影响。古天然气水合物一旦存在就势必对油气产生封盖作用 ,从而有利于现存油气资源的保存。最后对我国东部盆地古天然气水合物存在的可能性进行了探讨更多还原

【Abstract】 Natural gas hydrate which plays a fair role in sealing the conventional oil and gas reservoirs is a new unconventional energy resources with great potentialities.Based on the achievements and developments in studying natural gas hydrates at home and abroad,the mechanism of causing the oil and gas reservoirs to be tightly sealed by the natural gas hydrates is systematically analyzed in the paper through discussing the formation mechanisms,evolution properties and distribution laws of the natural gas hydrates.In light of the research on their control effects on petroleum (especially gas) accumulation and reservoir preservation,several geologic models of oil and gas accumulation and preservation related to the natural gas hydrates are proposed,such as vertically and laterally screened models,screened by drape and screened by contact models and syngenetically and epigenetically screened models,etc.Although the natural gas hydrate resources discovered currently may be able to be relatively small in China,the important influences of ancient natural gas hydrates on the oil and gas reservoirs in existent sedimentary basins should be paid great attention to.Once the ancient natural gas hydrates formed,they inevitably played an role in sealing oil and gas,which was beneficial to oil and gas preservation.Finally,the possibility of finding the ancient natural gas hydrates in the east basins in China is discussed in the paper.更多还原