负压空吸作用是油气藏的成藏机制之一

Negative pressure and empty suction: one of the forming-reservoir mechanisms of structure fractured oil and gas reservoirs

地震是构造应力在瞬间强烈释放的表现,震区产生的负压空吸作用对地下流体运动影响很大,是油气成藏的机制之一。将油气在负压空吸作用下运聚成藏的过程划分为4个阶段:地震前平衡期地应力差值微小,油气在浮力等驱动力作用下发生运移;地震前准备期孕震区地应力逐渐集中,储集应变能;地震发生时为成藏期,震区应力瞬间释放,在震区及其附近产生地震裂缝网络,在巨大地应力差值造成的负压空吸作用下,地下流体和所含油气快速运移于新生裂缝网络中,形成油气聚集;地震后平衡期内油气运移不明显,如果震后新生裂缝区裂缝中的地下水形成新矿物而占据裂缝体积,将给裂缝中聚集的油气增加附加压力。

Earthquakes have influences on forming oil and gas reservoirs. Stress librated from earthquake would always be violently changed before or after an earthquake. It's used to analyze the processes of oil and gas migration and forming reservoirs, which are divided into four periods: pre-equilibrium, pre-preparation, forming-reservoir and re-equilibrium. In the process of forming reservoirs, the earthquake fractured net will be produced. After the stress values jump from highest to lowest, the underground liquids quickly migrate and fill fully the new produced fractures and form structure fractured reservoirs in the process of the giant stress differences, the negative pressure and the empty suction.