川东高峰场地区长兴组生物礁地震预测  

Seismic prediction of reef in Changxing Formation of Gaofengchang Area,Eastern Sichuan Basin

作　　者：彭才[1] 文其兵[2] 曹博超[3] 张延充[1] 蒲平文[1] 

机构地区：[1]川庆钻探工程有限公司地球物理勘探公司,四川成都610213 [2]西南油气田分公司重庆气矿,重庆400021 [3]川庆钻探工程有限公司地质勘探开发研究院,四川成都610000

出　　处：《石油物探》2013年第2期207-211,114,共5页Geophysical Prospecting For Petroleum

摘　　要：高峰场区块在上二叠世末期位于"开江—梁平"海槽东南消失过渡带,为缓坡沉积环境。长兴组地层厚度在各相带内变化较小,生物礁发育区地层厚度无明显增厚特征,导致该区生物礁预测难度增大。早期地震数据处理针对多个目的层进行,由处理引起的长兴组内部杂乱地震反射假象影响了生物礁预测精度,多口生物礁专探井失误。专门针对长兴组进行了保真保幅的地震数据精细处理,提高了长兴组内部成像效果;分析了该区生物礁地震相并总结了地震响应特征。模型正演分析表明,通过长兴组顶部振幅分析不能精细预测生物礁的边界。结合钻井分析和地震正演结果,针对生物礁杂乱反射特征不明显和长兴组顶部振幅分析的不足,采用分频解释技术,提高了生物礁预测的精度。In the end of the Permian period,Gaofengchang area is located in the disappeared transition zone of southeastern 'Kaijiang-Liangping' trough as the gentle slope sedimentary environment.The thickness of Changxing Formation varies little in each sedimentary facies,so does the almost invariant formation thickness of reef developed area,which increases the difficulty of reef prediction.Early seismic data processing aims at multi-formations,which leads to mixed and disorderly seismic reflection of internal Changxing and eventually affects the accuracy of reef prediction.As a result,several reef exploration wells had failed in the area.Therefore,we carry out fidelity-preservation and amplitude-preservation fine processing on seismic data to improve the internal imaging effect in Changxing Formation.Meanwhile,we analyze the reef sedimentary facies and conclude their seismic responses.Model simulation indicates that the boundary of reef cannot be finely predicted by amplitude analysis at the top of Changxing Formation.Combining drilling analysis with seismic simulation results,aiming at the above deficiencies,the frequency-division interpretation technique is used on seismic data fine processed specifically for Changxing Formation which improves the accuracy of reef prediction.

关 键 词：川东地区 高峰场地区 生物礁 长兴组 地震预测 

分 类 号：P631.4[天文地球—地质矿产勘探]