四川长宁页岩总有机碳地震定量预测方法  

Seismic quantitative prediction technique for shale TOC in the Changning,Sichuan

作　　者：侯华星 欧阳永林[3] 曾庆才[3] 杨青[3] 陈胜[3] 朱莎[4] 

机构地区：[1]中国科学院大学物理科学学院,北京100049 [2]中国科学院渗流流体力学研究所,河北廊坊065007 [3]中国石油勘探开发研究院廊坊分院,河北廊坊065007 [4]大庆油田有限责任公司第四采油厂,黑龙江大庆163511

出　　处：《东北石油大学学报》2016年第5期18-27,共10页Journal of Northeast Petroleum University

基　　金：国家重点基础研究发展计划(973计划)项目(2013CB228000)

摘　　要：页岩总有机碳(TOC)质量分数是评价页岩储层生烃能力的重要参数,也是页岩气"甜点"预测的关键要素。以四川盆地长宁地区下志留统龙马溪组页岩气储层为研究对象,提出一种页岩TOC地震定量预测方法。首先,通过测井解释和地震资料处理分析,明确页岩优质储层地震和测井响应特征;然后,通过地震岩石物理分析和测井资料分析,确定TOC的敏感参数为密度,并建立它与TOC质量分数之间的拟合关系,得到研究区TOC质量分数经验公式;最后,结合叠前地震反演技术获得的密度体和经验公式,将密度体转化为TOC数据体,进而定量预测TOC质量分数。结果表明,利用叠前反演获得的密度体可进行TOC质量分数定量预测,并且预测的TOC质量分数相对误差小。该技术在研究区页岩气勘探中有很好的适应性。The w(TOC)is an important index for the evaluation of hydrocarbon generation potential of shale reservoirs,and the key factor for the prediction of shale gas sweet spot.Taking the shale gas reservoirs of the Longmaxi formation of the lower Silurian,Changning area,Sichuan basin,as the object of study,a kind of seismic quantitative prediction technologies of TOC was developed.First,seismic and logging responses of high quality shale reservoirs were defined through logging interpretation and processing and analysis of seismic data.Then,through the analysis of seismic rock physics and log data,density was found to be sensitive to TOC.The fitting relationship between density and w(TOC)was established and an empirical formula for calculating the TOC was obtained.Then based on the density volume from pre-stack seismic inversion and empirical formula,the density volume was converted to the TOC data volume,so as to realize the quantitative prediction of w(TOC).Finally,through the TOC volume to delineate the spatial distribution of the shale gas reservoirs with the study area.The result shows that w(TOC)can be quantitatively predicted by density of pre-stack inversion,and the relative errors are small.And it also shows the technique for shale gas exploration has a good adaptability in the study area.

关 键 词：页岩气 地震预测 总有机碳质量分数 敏感参数 叠前反演 经验公式 四川长宁 

分 类 号：TE132[石油与天然气工程—油气勘探] P631.8[天文地球—地质矿产勘探]