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首页> 外文期刊>Natural Gas Industry B >Controlling effect of three major faults on gas accumulation in the Xujiaweizi faulted depression, Songliao Basin
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Controlling effect of three major faults on gas accumulation in the Xujiaweizi faulted depression, Songliao Basin

机译：松辽盆地徐家围子断陷三大断层对天然气成藏的控制作用

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Understanding the major controlling factors of gas accumulation in the Xujiaweizi faulted depression of the Songliao Basin is of great significance to future gas exploration. However, they were seldom studied in the context of major faults including Xuxi, Xuzhong and Xudong. Based on fine interpretation of 3D seismic data acquired in this area, the controlling effect of these three faults on gas accumulation and distribution was identified through a composite analysis of the three faults and the gas accumulation conditions considering the characteristics of development and distribution of the three major faults. The following conclusions were obtained. (1) These faults jointly control the development of coal measure source rocks in the Lower Cretaceous Shahezi Fm. Such rocks show three high-value areas of thickness (with the maximum thickness of over 1000?m) and have a large potential of hydrocarbon generation. These faults provide passages for gas to migrate upwards to the overlying reservoirs. (2) These faults act as the pathways for magma to protrude upwards into the shallow crust during the deposition of Early Cretaceous Yingcheng Fm. Volcanic rocks are well-developed around the faults, forming favorable fractured volcanic reservoirs. (3) These faults provide effective sealing conditions for gas accumulation in the volcanic reservoirs. If the fault cutting Ying 1 Member is juxtaposed by volcanic reservoirs and sandstones or conglomerates at both walls, the fault is sealed laterally, which is favorable for gas accumulation, and gas layer is proved through drilling; otherwise, if juxtaposed by volcanic rocks, the fault is not sealed laterally, which is unfavorable for gas accumulation, and water layer is confirmed through drilling.
机译：了解松辽盆地徐家围子断陷天然气成藏的主要控制因素，对今后的天然气勘探具有重要意义。但是，很少在诸如徐溪，徐中和徐东等重大断层背景下研究它们。在对该地区采集的3D地震资料进行精细解释的基础上，综合考虑这3个断层的发育和分布特征，通过对3个断层和天然气成藏条件的综合分析，确定了这3个断层对天然气成藏和分布的控制作用。主要故障。得到以下结论。 （1）这些断层共同控制了下白垩统沙河子组煤系烃源岩的发育。这种岩石显示出三个高价值的厚度区域（最大厚度超过1000？m），并且具有很大的生烃潜力。这些断层为气体向上迁移到上覆的储层提供了通道。 （2）这些断裂是早白垩世营城组沉积过程中岩浆向上突入浅地壳的通道。断裂周围火山岩发育良好，形成了有利的裂缝性火山岩储集层。 （3）这些断层为火山岩气藏中的气藏提供了有效的封闭条件。如果断层切割Ying 1构件在两壁上都被火山岩储集层和砂岩或砾岩所并置，则断层被横向密封，有利于天然气的聚集，并且通过钻探证明了天然气层。否则，如果与火山岩并列，则断层不能横向封闭，不利于天然气成藏，并通过钻探确定水层。

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