湖相泥页岩天文地层旋回测井识别在沾化凹陷沙三下亚段的应用  

Log Identification of Astronomical Cycle in Lacustrine Facies Mud Shale and Its Application in the Lower 3rd Member of Shahejie Formation in Zhanhua Sag

作　　者：闫建平[1,2] 言语 彭军[1,2] 冯春珍 耿斌[5] 李兴文 

机构地区：[1]西南石油大学天然气地质四川省重点实验室,四川成都610500 [2]西南石油大学地球科学与技术学院,四川成都610500 [3]中国石油大庆油田采油六厂一矿,黑龙江大庆163712 [4]中国石油集团测井有限公司长庆事业部,陕西西安718500 [5]中国石化胜利油田勘探开发研究院,山东东营257015

出　　处：《测井技术》2017年第6期701-707,共7页Well Logging Technology

基　　金：国家自然科学基金项目页岩气储层微观结构及岩石物理响应数值模拟研究(41202110);四川省应用基础研究计划项目泥页岩地层周期及高分辨率沉积旋回测井识别研究(2015JY0200);油气藏地质及开发工程国家重点实验室(西南石油大学)开放课题湖相泥页岩岩相类型;特征与电性响应关系研究(PLN201612);天然气地质四川省重点实验室开放基金项目湖相泥页岩地层岩相测井定量识别方法研究(2015trqdz07);四川省教育厅"天然气地质"创新团队项目(13TD0024)联合资助

摘　　要：以渤海湾盆地沾化凹陷沙三下亚段半深湖-深湖相泥页岩为研究对象,采用频谱、功率谱及小波多尺度分析方法对自然伽马测井数据进行处理。通过频谱分析识别出与地球轨道3要素比值相符的优势厚度,利用基于小波分析的功率谱法确定出与偏心率理论曲线频率相近的尺度值,在该尺度值下进行小波分解,将结果与偏心率变化理论曲线进行对比划分泥页岩地层中的天文周期,将沾化凹陷沙三下亚段划分出18个偏心率周期,确定了其内部时间格架,有效地解决了湖相泥页岩地层分层困难的问题。发现偏心率值较高的时期方解石含量较低,总有机碳平均含量较高,指示着相对湿润的气候,有益于形成优质烃源岩,也为预测有利泥页岩储层提供了依据。With the lower 3 rd member of Shahejie Formation in Zhanhua Sag in Bohai Bay Basin as study subject,we use spectral analysis,power spectral analysis and multi-scale analysis based on wavelet to process the well logging data.Firstly,the spectral analysis is used to identify the cycle thickness which is conformed to specific value of the three elements in the earth orbital parameters.Then the scale value is confirmed based on the wavelet analysis and the power spectrum which is near to the theoretical curves of eccentricity.The wavelet decomposition is done in this scale value and the result is compared to the theoretical curves of eccentricity to confirm the astronomy cycles in the mud shale.It＇s used to determine the inside time framework.The lower 3 rd member of Zhanhua Sag is divided into 18 eccentricity cycles.The problem of theformation classification in lacustrine facies mud shale is solved by this way.And the period of high eccentricity has a relatively humid climate with high average content of TOCwhich is benefit to form high-quality source rock to provide the basis to the shale reservoir forecast.

关 键 词：测井识别 天文周期 小波变换 功率谱 偏心率 

分 类 号：P631.84[天文地球—地质矿产勘探]