相位转换技术在岩性解释中的应用

Application of Phase Conversion Technique in Lithology Interpretation

周晶 朱睿哲 吕鹏 严曙梅

ZHOU Jing ZHU Ruizhe LYU Peng YAN Shumei

中国石油化工股份有限公司上海海洋油气分公司勘探开发研究院, 上海 200120

Institute of Exploration and Development, SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China

研究区为海上区块，目的层岩性圈闭发育，但井网稀疏，测井资料匮乏，进行储层预测严重依赖地震资料，高品质的地震资料是岩性识别的保障，因此提高地震资料分辨率至关重要。为了提高岩性解释精度，该文在综合分析研究区地质现状的基础上，利用Landmark软件，采用了一种合理简捷适用于岩性解释尤其是薄储层解释的技术方法，采用零相位子波提取、相位校正、道积分及90°相位转换等技术手段，最终使地震数据更接近实际地层的反射系数特征。优化后的数据证明更益于地震解释和薄储层预测工作，预测结果最终通过钻井得到了验证。

The study area is an offshore block with lithological traps developing in the target layer. Due to the sparseness of the well network and the scarcity of logging data, reservoir prediction mainly depends on seismic data. High quality seismic data is the guarantee of lithology identification, so it is very important to improve the resolution of seismic data. In order to improve the accuracy of lithology interpretation, this paper discusses a reasonable and simple method for lithology interpretation, especially for thin reservoir interpretation based on comprehensive analysis of the geological characteristics of the study area and Landmark software. By means of zero-phase wavelet extraction, phase correction, channel-integral and 90°-phase conversion, the seismic data are closer to the actual reflection coefficient characteristics. The optimized seismic data is more beneficial for seismic interpretation and thin reservoir prediction. The prediction results were finally well verified by drilling.

https://doi.org/10.3969/j.issn.1008-2336.2020.01.012