论文详情
近年关于四川盆地飞仙关组鲕滩的勘探开发多集中在开江梁平海槽两侧,为进一步拓展盆地内飞仙关组鲕滩发育有利区,利用大量新采集的盆地大格架剖面和二维、三维地震资料,充分结合地质认识、钻井资料和测井资料,开展了川中川东地区飞仙关组鲕滩分布规律研究。通过优选整个四川盆地飞仙关组井位,精细标定鲕滩储层在不同相区的地震剖面上的响应特征和发育位置,结合盆地大格架剖面上飞仙关组沉积特征,建立了飞仙关组鲕滩从盆地中部到川东北地区的发育模式,发现了四川盆地飞仙关组鲕滩分布及迁移规律,提出了鲕滩储层发育是受物源方向和裂陷槽联合控制的沉积模式的地质新认识。研究认为四川盆地飞仙关组鲕滩具有“自西南向东北方向”迁移的特征,川中川东地区沿蓬溪武胜台凹和开江梁平海槽发育3期大规模鲕滩:飞一段前积鲕滩体,飞二、飞三段前积鲕滩体和飞二、飞三段加积鲕滩体,川中中部蓬溪武胜台凹处也发育与开江梁平海槽两侧一样的飞仙关组高能鲕滩储层,这一发现为飞仙关组地层的勘探提供了新的勘探区域,具有重要的勘探价值。
In recent years,the exploration and development of the oolitic beaches of the T1f Formation in the Sichuan Basin has been focused on the two sides of the Kaijiang-Liangping trough.To identify additional favorable locations,the spatial distribution of these beaches in central and east Sichuan was investigated using a large number of newly collected large-scale frame lines and two-and three-dimensional seismic data,which were combined with drilling and logging data and a geological model.The well locations within the T1f Formation were optimized across the entire Sichuan Basin,and a fine characterization of the response and development of the oolitic beach reservoirs in areas with different facies was achieved.The sedimentary characteristics of the T1f Formation in the Daggejia section of the basin were also analyzed.Based on these insights,a spatial distribution and migration model for the T1f oolitic beaches was established,together with a development model spanning from the center to the northeast of the basin.A new geological understanding was proposed,which suggests that the development of the oolitic beach reservoirs is jointly controlled by the direction of provenance and the rifting trough.It was shown that the beaches have experienced northeastward migration.The beaches along the Pengxi-Wusheng platform sag and the Kaijiang-Liangping trough could be grouped into three development stages,namely:the Feiyi pre-oolitic beaches,the Feier and Feisan pre-oolitic beaches,and the Feier and Feisan oolitic beaches.High-energy oolitic beach reservoirs of the same type as those found on the two sides of the Kaijiang-Liangping trough were also found in the Pengxi-Wusheng platform sag in the central part of the basin,indicating the possibility of a new and valuable exploration area.
国家自然科学基金项目“川东北早三叠世飞仙关期同期多排碳酸盐岩台缘带不对称沉积结构及成因”(41302089)资助。