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川东上二叠统生物礁气藏属碳酸盐岩岩性圈闭，礁岩和非礁地层物性差异小，非均质性强，地震识别预测难度大，多解性问题突出。在进一步研究生物礁气藏分布规律，深化对地震异常现象认识的基础上，提出了以寻找较大型的陆棚边缘礁气藏为主要目标，以沉积相—地震相精细解释为核心内容，以地质为基础，测井为桥梁，地震为主要拓展手段的生物礁多元信息综合预测方法。包括三个方面相互有机联系的工作：①通过大量钻井和测井资料对比研究，重塑上二叠统岩相古地理环境，建立了本区长兴组碳酸盐岩缓坡相沉积相模式；②精细对比解释地震相及其变化的地质含义，建立了与沉积相模式对应的地震相变响应模式，进而解释沉积微相展布，预测陆棚边缘礁发育的有利地区；③针对有利相带内的边缘礁目标，探索应用各种正反演精细处理手段，进一步落实有利的勘探目标。在实际勘探应用中取得较好的效果

A Study of Multivariate Informations Comprehensive Prediction Method for the Biohermal Gas Reservoir in Upper Permian Series in East Sichuan

The biohermal gas reservoir in Upper Permian Series in east Sichuan belongs in the lithologic trap of carbonate rock,the difference in physical property between the reef rock and nonreef formation being small and having a great heterogeneity,a great difficulty in seismic identification prediction and an outstanding varied interpretation problem.On the basis of further researching the distribution law of the biohermal gas reservoir and deepening the recognition of seismic anomaly phenomenon,the multivariate informations comprehensive prediction for organic reef is put forward by taking finding larger shelf edge reef gas reservoir as the main objective,the accurate interpretation of sedimentaryseismic facies as the nucleus content,geology as the basis,well log as the bridge and seismic method as the main measure,which includes following three organicconnection works:(1)The gentle slope sedimentary facies mode of the carbonate rock in Changxing Formation is this area has been established by comparing and researching a lot of the drilling and logging data and reseting up the lithofaciespaleogeographic environment of upper Permian Series;(2)The seismic facies change response mode corresponding to the sedimentary facies mode has been established by precisely comparing and interpreting the seismic facies change,and then,the distribution of sedimentary microfacies has been interpreted and the favorable area of shelf edge reef growth has been predicted;(3)Taking aim at the edge reef in favorable facies belt and through trying to adopt precisely processing methods of various forward and inverse problems,the favorable exploration objective has been ascertained,obtaining a better result in its application to practical exploration.