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天然气易于散失的特性 ,决定了整体封存体系的高标准、严要求 ,评价的思维应以板桶理论 (木桶效应 )为指导 ,特别要重视局部对整体的决定作用。天然气的封存与石油不同 ,整体封存体系的内涵 ,必须强调结构的立体性与功能的有效性。川东、川东北的油气勘探实践表明 ,下部 (中、古生界 )的超压流体系统与上部 (中、新生界 )的高压 -静压流体系统 ,共同构成整体封存体系的立体性 ,实际是一个物性、浓度、压力为一体的复合封闭结构。有效性取决于 :(1)埋深 ;(2 )区域水动力 ;(3)晚期抬升 ;(4)抬升时限。立体性为构建 ,有效性为改建 ,只有二者的统一方能发挥整体封存的最大功能
Natural gas is easy to lose the characteristics of the decision of the overall system of storage of high standards and strict requirements, evaluation of the thinking should be based on the barrel theory (barrel effect) as a guide, with particular emphasis on the part of the overall decisive role. Natural gas storage and oil is different from the overall seal storage system, we must emphasize the structure of the three-dimensional and functional effectiveness. The exploration of oil and gas in eastern Sichuan and northeastern Sichuan shows that the overpressure fluid system in the lower part (Mesozoic and Paleozoic) and the high pressure-hydrostatic fluid system in the upper part (Mesozoic and Cenozoic) constitute the three-dimensional nature of the whole sequestration system, Is a physical property, concentration, pressure as one of the composite closed structure. Validity depends on: (1) depth of burial; (2) regional hydrodynamics; (3) late-stage uplift; (4) up-time. Three-dimensional as the construction, the effectiveness of the reconstruction, only the unity of the two can play the greatest function of the overall storage