川南地区嘉陵江组地震相特征及勘探有利区预测

为进一步拓展四川盆地川南地区油气勘探的潜力，借鉴川东北地区鲕滩、生物礁的地震预测经验，尝试应用地震相分析手段来研究川南下三叠统嘉陵江组沉积相，进而预测嘉陵江组油气勘探的有利区带。首先，在研究区内根据地震反射特征共划分出丘形、平行-亚平行、“弱反射”及杂乱相4种地震相类型，再通过与单井相的符合率验证，发现丘形及弱反射地震相对应于嘉陵江组有利沉积相带，也是台内滩在地震剖面上的主要表现特征；最后结合勘探程度及圈闭保存条件等因素，预测出川南嘉陵江组油气勘探的有利区带为南部纳溪-白节滩构造、庙高寺-二里场构造一带及北部六合场-花果山构造一带。

Features of seismic facies and prediction of play fairways of the Jialingjiang Formation,southern Sichuan Basin

Learning from the experiences of seismic prediction of oolitic bank and bioherms in the northeastern Sichuan Basin,we tried for the first time to study the sedimentary faices of the Jialingjiang Formation in the southern Sichuan Basin through seismic facies analysis and to predict play fairways there.We identified four types of seismic facies including mound,parallel-subparallel,weak reflection and chaotic seismic facies according to seismic reflectance signatures.The verification with single well sedimentary facies reveals that the mound and weak reflection seismic facies are favorable zones in the Jialingjiang Formation.They also represent the main seismic reflectance signatures of intraplatform bank on seismic sections.Exploration maturity and trap sealing conditions were integrated to predict play fairways of the Jialingjiang Formation in the southern Sichuan Basin,where the Naxi-Baijietan and Miaogaosi-Erlichang areas in the south and the Liuhechang-Huaguoshan area in the north are believed to be favorable for hydrocarbon exploration.