断陷湖盆陡坡带砂砾岩体沉积期次的划分技术

 综合地震、测井及钻井信息，建立以三维地震资料的层序地层解释为基础，以岩心、成像测井资料作标定，以单井测井信号小波变换分析为核心的砾岩体沉积旋回划分技术。利用成像测井资料进行沉积旋回识别的关键在于合理实现“图像”与“岩相”的转换，并利用岩心资料对地层成像测井图像进行刻度，消除地质解释的多解性，建立不同类型的岩相模式。通过地震约束和岩心、成像测井标定下的测井信号多尺度、高分辨率的小波变换分析,可将一维测井信号变换到二维时频域，便能很好地反映信号的周期特征和局部异常，进而为砂砾岩体的旋回划分和内部结构解剖提供技术支持。对济阳拗陷车镇凹陷陡坡带古近系巨厚砂砾岩体的实际分析结果表明，该技术对于用生物化石或测井组合法难以进行地层划分和对比的砂砾岩发育区的沉积期次划分和内部结构解析具有较好的应用前景。

Division of sedimentary cycle of sand-gravel rock mass in steep slope of faulted lake basin

Synthesizing seismic, logging and drilling information, based on sequence-stratigraphic interpretation of 3-D seismic data, taking core and imaging logging data as calibration and wavelet transform of logging signal in individual well as kernel, the technique of division of sand-gravel rock mass sedimentary cycle was built up. The key using imaging logging data to carry out the identification of sedimentary cycle lies on the reasonably implementing the transformation from "image" to"lithofacies", and using core data to calibrate the stratigraphic imaging logging image, which diminishes the multiple solutions of geologic interpretation and creates different types of lithofacies modes. The 1-D logging signal can be transformed into 2-D time-frequency domain by multi-scaled and high-resolution wavelet transform analysis of logging signals under the seismic constraint and imaging logging calibration, which can better reflect the periodic feature and local anomaly of signals and further gives technical support to cycle division of sand-gravel rock mass and dissection of internal structure. The practical analysis of Paleogene giant thickness of sand-gravel rock mass in steep slope of Chezhen sag of Jiyang depression showed that the technique has good application prospect for the division of sedimentary cycle and dissection of internal structure in the sand-gravel rock mass-developed zone where using biologic fossil or logging array to make stratigraphic division is very difficult.