摘要
针对目前地层划分、对比存在人为性、多解性等问题,首先仔细分析了野外露头与岩心的沉积序列特点,研究了地层的叠置序列与旋回结构;进而建立了相应的地质模型,通过地质模型把地层的旋回结构转化成数值模拟信号;最后根据信号特征,提出了综合预测误差滤波分析方法,并研究出该方法的原理、步骤、功能。在此基础上,利用该方法对模拟信号进行处理分析,提取出反映地层叠置及旋回结构的频谱趋势线,并搞清频率趋势线的地质意义乃间接反映了当时的沉积环境及基准面变化过程。由此,可以找出反映同一等时地层界面的拐点及变化趋势,根据拐点及变化趋势完成了地层的等时对比。这为地层精确划分及真正意义上的等时对比奠定了基础。通过对实际测井数据的处理,验证了该方法的有效性。
Aiming at solving the problems such as difficulty in stratigraphic division, subjectivity and ambiguity of strati- graphic correlation, this paper studied the superimposition sequence and cycle structures of strata and established corre- sponding geological models based on the analysis of the sedimentary sequences on outcrops and cores. We converted the structures of sedimentary cycles into signals of numerical simulation via the geological model. According to the features of the signals, we proposed the comprehensive prediction error filter method and presented its principle, steps and functions. Frequency trend lines that can reflect the stratigraphic superimposition and structures of sedimentary cycles were extrac- ted through processing of the simulation signals, and were hnked indirectly with the changes of the sedimentary environ- ment and base level. Therefore,we can find the inflection points and trends that reflect the same isochronous stratigraphic surfaces. According to the inflection points and trends, we can perform isochronous stratigraphic comparison, providing a solid basis for precise stratigraphic division and isochronous comparison. Processing of real logging data shows that this method is valid.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2013年第4期564-572,共9页
Oil & Gas Geology
基金
国土资源部公益性行业科研专项(201311107)
中国石油科技创新基金项目(2012D-5006-0103)
中央高校基本科研业务费专项资金项目(2652011282)
关键词
测井数据
滤波分析
等时对比
地层划分
logging data, filter analysis, isochronous correlation, stratigraphic division
