黄桥工区走滑断裂与非烃气体运、聚关系的分析与思考

Analysis and considerations on the relationship between strike-slip faults and non-hydrocarbon gas migration and accumulation in Huangqiao area

黄桥地区自1983年发现二氧化碳气田以来,先后发现了二氧化碳、氦气等非烃气体资源,结合区域非震、地质等资料的研究,认为沿江断裂为该区域内非烃气体运移通道,是非烃气体运聚的主控因素。利用近几年的三维地震重处理资料,经过精细解释,发现走滑断裂广泛分布在工区内,继而详细研究走滑断裂的活动期次、综合分析已有钻井产层、成藏期和产量等,认为这些走滑断裂控制着非烃气体的运移和聚集。"底部有断裂、顶部有构造、属性有亮点",具备这三要素的地区是非烃气体勘探的有利区域。非烃气体也是下扬子地区的重要资源和勘探对象。

Since the discovery of a carbon dioxide gas field in 1983,non-hydrocarbon gas(NHG)resources such as carbon dioxide and helium have been continuously discovered in Huangqiao area.Based on the study of regional non-seismic and geological data,it was hypothesized that the fault along the river constituted the migration channel of NHG in the area and acted as the main controlling factor of NHG migration and accumulation.By reprocessing and fine interpretation of three-dimensional seismic data in recent years,it was found that strike-slip faults are widely distributed in the study area.Through detailed research on the active periods of strike-slip faults,comprehensive analysis of the existing drilling production layers,and a study of reservoir formation periods and production,it was concluded that these strike-slip faults control the migration and accumulation of NHG.Areas characterized by faults at the bottom,structures at the top,and bright spots in attributes are favorable for NHG exploration.NHG is also an important resource and exploration target in the lower Yangtze.Therefore,more in-depth studies are warranted.