【摘要】 在工区面积大、钻井少的情况下开展地震相研究,可以有效绘出沉积相展布图。对四川盆地中部雷口坡组四3亚段利用GS1和YS104两口井进行地震地质标定,建立了膏盐湖、白云岩坪及颗粒滩等几种不同沉积微相的地震响应模式。膏盐湖相表现为强振幅、高连续的地震响应,而颗粒滩及白云岩坪主要表现为中振幅、低连续的地震响应特征。在地质标定基础上,对全区利用波形分类技术开展地震相研究,恢复了古沉积环境,获得了颗粒滩相及白云岩坪的展布图,这些分布区是有利储层的发育区。龙岗—营山—南充—蓬溪一带处于颗粒滩、白云岩坪有利相带,且处于雷四3亚段地层剥蚀线附近,受岩溶改造强烈,储层较为发育,是川中地区的重要勘探对象。更多还原

【Abstract】 Distribution maps of sedimentary facies can be obtained by studying seismic facies in a large research area where a few wells were drilled.Through seismic and geological demarcation to two typical wells,Well GS-1 and Well YS-104,in central Sichuan Basin,the seismic response models are established for different sedimentary facies in Middle Triassic Leikoupo43 Submember,such as gypsum lagoon,dolomite tidal flat and grainstone shoal facies.On the base of geological demarcation,waveform classification technology are utilized to divide different seismic facies to restore the sedimentary paleo-environment and the distribution maps of grainstone shoal and dolostone tidal flat facies are delineated,which are just the areas of favorable reservoirs.The study result shows that the area from Longgang,Yingshan,Nanchong to Pengxi is located in the favorable sedimentary zones of grainstone shoal and dolostone tidal flat facies where reservoirs are developing since they were affected by karstification near Leikoupo 43 Submember denudation border so that they should be the important area of exploration target in central Sichuan Basin.更多还原