【摘要】 文章围绕连接气源岩与圈闭的有效运移通道的高效输导效率问题 ,分析了克拉 2气田成藏的主控因素。克拉 2构造有效运移通道为盐下断裂F2 ,断裂活动时期产生优势裂隙造成负压 ,抽吸早期生成于侏罗系、三叠系烃源岩中的天然气 ,诱导其向断裂带中运移 ,即为“地震泵”抽吸作用。之后大规模天然气在构造挤压应力和超压的驱动下沿断裂带快速运移并充注于圈闭中 ,由于“入字型”的散失断裂不直接连接圈闭 ,因此充注到圈闭中的天然气不会大量散失。断层停止活动后 ,穿盐断裂F1受压很快垂向封闭 ,侧向砂泥对接以及良好的盖层品质使天然气得以保存。更多还原

【Abstract】 The main control factor of forming Kela-2 gas field is analyzed around the transmission efficiency problem of the effective migration channel connecting gas source rocks and traps in the paper.The fault F 2 under the satl layer was an efficient migration channel for Kela-2 structure.The negative pressures caused by the fractures formed in fault activity period might inhale the gas accumulated early in the sands included in hydrocarbon source beds and induce it to be migrated into the fracture zone,i.e. so-called“seismic pump”inhaling effect;then,under the driving of tectonic extrusion stresses and overpressures,a vast amount of gas was quickly migrated along the fault zone and charged into the traps; and,because the extensional λ-type fault didn′t directly connect with the traps,the gas charged into them wouldn′t be lost.After the fault activity′s being ended,the fault F 1 through salt layer was quickly closed.The butted joint of sandstones and mudstones and the good quality cap rocks caused the natural gas to be preserved in the traps.更多还原