川西XC地区雷口坡组顶不整合面储层预测方法  

Reservoir prediction in the top Leikoupo unconformity surface in the area XC,Sichuan

作　　者：李素华[1] 卢齐军[1] 许国明[1] 刘诗荣[1] 

机构地区：[1]中国石化西南油气分公司勘探开发研究院海相所,贵州贵阳550004

出　　处：《石油地球物理勘探》2013年第5期793-798,674+854,共6页Oil Geophysical Prospecting

摘　　要：川西XC地区雷口坡组顶不整合面海相碳酸盐岩储层的地震、地质特征表现为:储层埋藏较深,储集空间以溶蚀孔洞、裂缝为主,横向非均质性较强,地震资料主频较低,因此利用常规地震资料难以满足储层精细描述的要求。为此,本文利用谱分解技术将时间域的地震信号变换到频率域,获得较原始地震数据更加丰富的分频数据体,在此基础上进行含油气性检测及分频成像、相位、相干、曲率等多属性的裂缝综合预测。预测结果表明:①储层呈NE向条带状展布,Xins1井储层最厚,Xiaos1井最薄,含油气分布区主要集中在工区西部;②雷口坡组顶不整合面储层段发育"网状"层间断层,向上延伸至小塘子组,向下可延伸至雷四中亚段,裂缝带对油气输导及改善岩溶发育带储层起到十分重要的作用。预测结果与钻井结果相吻合,可为下一步油气勘探提供依据。In the top Leikoupo unconformity surface in the area XC,Sichuan carbonate reservoirs were deeply buried with fractures,caverns and horizontal inhomogeneity.Their reflections on seismic section show low dominant frequency.So carbonate reservoir characteristics cannot be exactly described on conventional seismic sections.We adopt some new reservoir prediction technologies such as spectral decomposition and multi-attributes.First spectral decomposition technology transform time domain seismic data volume into frequency domain seismic data volume.Then hydrocarbon potential is examined on low frequency band,and multi-attributes such as RSI,phase,coherence,dip,azimuth and curvature are used to predict fracture belts.They were used comprehensively to reduce the multi-solution of prediction results.The following observations are obtained from the predictions:① The reservoir distribution is in NE belt. The thickest reservoir is located at Well Xins1,the thinnest one located at Well Xiaos1.Hydrocarbon bearing zone is mainly distributed in the western area.②Interlayer-net fractures were developed on the top Leikoupo unconformity surface reservoir. These fractures are extended upward to Xiaotangzi formation and downward to the middle Leikoupo formation.The fracture belt has important effect to transport oil and gas and improve the development of caverns reservoir.The prediction results are very well fitted with drilled results and provide important information for the future exploration.

关 键 词：雷口坡组 不整合面 谱分解技术 含油气性检测 裂缝预测 

分 类 号：P631[天文地球—地质矿产勘探]