论文部分内容阅读
四川盆地上二叠统长兴组生物礁的预测工作,在20世纪80～90年代主要以地质研究为主,研究初期常有生物礁目标井打不到生物礁,而非目标井又时而钻遇生物礁的现象。近年来,结合地质、钻测井资料,利用区域大剖面地震相预测技术,建立了一套识别晚二叠世末期台地—海槽沉积相带的方法,首次分别在川北、川中及川东地区地震大剖面发现了台地—海槽地震相形迹。在此基础上,对上述地区生物岩隆(礁、滩)有利相带进行了重点识别,总结了台地边缘生物岩隆的地震相预测方法,并编制了四川盆地晚二叠世末期泛开江—梁平海槽古地貌及沉积相预测图,表明环海槽周缘生物岩隆具有延伸远、勘探潜力大的基本态势。通过川东五百梯、川中LG等区块的钻井表明,所应用的技术是预测二叠系碳酸盐岩礁、滩有利区带及勘探部署的实用技术。
The prediction of the reefs in the Upper Permian Changxing Formation in the Sichuan Basin was dominated by geological studies in the 1980s and 1990s. In the early stages of the study, reef targets were often missed by reef targets, Reef phenomenon. In recent years, based on the data of geology, drilling and logging, and using the prediction technology of the regional large-section seismic facies, a set of method to identify the late Late Permian platform-trough sedimentary facies belt has been established. For the first time in the northern Sichuan, Large section found the mesa-trough seismic trace. On this basis, the favorable lithofacies of reef and shoal in the above areas are identified, and the method of seismic facies prediction of biotite rocks at the margin of the platform is summarized. At the end of Late Permian in the Sichuan Basin, - Liangping sea trough paleo-geomorphology and sedimentary facies prediction map, indicating that the peripheral trough biotite Longyan has far extension, exploration potential of the basic trend. Drilling through blocks of 500 in East Sichuan and LG in Central Sichuan shows that the applied technology is a practical technique for predicting Permian carbonate reefs, favorable sea zones and exploration and deployment.