构造特征对重庆南川地区页岩气保存条件的影响

    The influence of structural characteristics on the preservation conditions of shale gas in Nanchuan area, Chongqing

    • 摘要: 从渝东南盆缘转换带南川区块构造特征入手,深入分析分层和分区差异构造特征及构造演化特征,明确南川地区不同构造特征对页岩气保存条件的影响。研究结果表明:①南川地区在纵向上分为4个滑脱层系,造就了纵向上的4个变形层;②南川地区在横向上从东往西构造受力作用逐渐减弱,从冲断特征变为断展特征,最后变为滑脱特征;③南川地区主要构造特征形成于中燕山期及晚燕山期;④南川地区冲断构造带整体保存条件较差,不利于页岩气的勘探开发,断展构造带保存条件好, 是页岩气勘探开发的有利区。滑脱构造带整体保存条件好,但由于页岩地层埋深较深,工程工艺成本高,暂时不满足效益开发要求,是未来页岩气勘探的有利目标区。

       

      Abstract: Starting from the structural characteristics of the Nanchuan block in the transition zone of the southeast basin margin of Chongqing, in-depth analysis of the layered differential structural characteristics, regional differential structural characteristics, and structural evolution characteristics, so as to clarify the influence of different structural characteristics on shale gas preservation conditions in the Nanchuan area.The research results show that, ①The Nanchuan area is divided into four detachment strata in the vertical direction, creating four deformation layers in the vertical direction.②The structural force in the Nanchuan area is gradually weakened from east to west in the horizontal direction, changing from thrust characteristics.It is a fracture feature, and finally becomes a slip feature.③The main structural features of Nanchuan area were formed in the Middle Yanshanian and Late Yanshanian.④The overall preservation conditions of the thrust structure belt in Nanchuan area are poor, which is not conducive to the exploration and development of shale gas; the fault extension structure belt has good preservation conditions and is a favorable area for shale gas exploration and development.The detachment structural belt has good overall preservation conditions, but due to the deep shale formation, it is a favorable target area for shale gas exploration in the next step.

       

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