川西南部地区栖霞组储层地震相特征

Geophysical Characteristics of Qixia Formation in Southwestern Sichuan Basin

川西南部地区栖霞组具有较好的勘探开发潜力,栖霞组储层分为白云岩储层与灰岩储层,白云岩储层主要发育于栖霞组二段,灰岩储层主要发育于栖霞组一段。为解决该区储层地震识别存在多解性的难题,结合测井资料、高分辨率地震资料开展了地震相识别以及不同储层发育类型的地震响应特征模式研究。结果表明,该区可划分出5种储层发育类型,对应5类地震相:Ⅰ类地震相与栖霞组二段中上部发育储层相对应;Ⅱ类地震相与栖霞组二段中下部发育储层相对应;Ⅲ类地震相与栖霞组一段中上部发育储层相对应;Ⅳ类地震相与栖霞组一段中下部发育储层相对应;Ⅴ类地震相与栖霞组储层不发育相对应。研究结果取得了良好的应用效果。

The Qixia formation in southwestern Sichuan has a good potential for exploration and development,the reservoirs in Qixia formation are divided into dolomite reservoirs and limestone reservoirs.Dolomite reservoirs are mainly developed in the second member of the Qixia formation,and the limestone reservoirs are mainly developed in the first member of Qixia formation.In order to solve the problem of multi solution in reservoir seismic identification in this area,the seismic response characteristics and seismic response characteristics of different reservoir development types were studied in combination with well logging data and high resolution seismic data.The results show that there are 5 types of reservoir development,corresponding to 5 types of seismic facies.Type I seismic facies correspond to reservoirs developed in the upper and middle parts of the second member of the Qixia formation.Type II seismic facies correspond to reservoirs developed in the middle and lower part of the second member of the Qixia formation.Type III seismic facies correspond to reservoirs developed in the upper part of the first member of the Qixia formation.Type IV seismic facies correspond to reservoirs developed in the middle and lower part of the first member of the Qixia formation.Type V seismic facies correspond to no reservoirs in Qixia formation.The results of the study have achieved good results.