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地下地质条件下天然气主要以游离气、溶解气、吸附气的形式保存,压力封闭和水(油)溶保存是天然气的主要保存方式。含气系统的保存需要一个立体空间上的封闭保存体系,区域盖层和直接盖层的封存保存功能不同,前者主要是构建一个封闭保存体系,后者直接遮挡或抑制天然气的扩散与渗漏。异常高压带的存在与否和水文地质条件是衡量区域封闭保存体系的两个重要标志。根据南方海相不同区块油气保存特性,划分出持续型(四川盆地型)、重建型(中、下扬子型)和残余型(秧坝型)三类不同的油气保存单元。
Under underground geological conditions, natural gas is mainly stored in the form of free gas, dissolved gas and adsorbed gas. Pressure sealing and water (oil) solution preservation are the main ways to conserve natural gas. The preservation of gas-containing system requires a three-dimensional spatial closed storage system, which has different sealing and preservation functions. The former mainly constructs a closed preservation system, which directly obstruct or restrain natural gas diffusion and leakage. The presence or absence of anomalous high pressure zones and hydrogeological conditions are two important hallmarks of a regional closed system. According to the characteristics of oil and gas reservoirs in different blocks of the southern marine facies, three types of reservoirs, ie, continuous (Sichuan basin type), reconstructed (middle and lower Yangtze type) and residual (Yangba type) reservoirs, are divided.