川东北元坝地区长兴组生物礁滩体系分频特征研究

摘要

川东北元坝地区二叠系长兴组生物礁滩埋藏深、横向变化大，用常规方法预测生物礁滩体描述困难。基于短时窗离散傅里叶变换的分频技术以及井震结合，确定了不同沉积相对应的频率范围，在此基础上刻画出了生物礁随频率变化的形态和平面展布特征，划分和确定了岩性油藏边界，为该区油气藏勘探提供了科学依据。%In Yuanba area of the northeastern Sichuan Basin, the reef-bank in the Permian Changxing Formation is characterized by deep burial depth and great lateral variation, hence is difficult to predict by conventional method. Based on well-seismic calibration and spectral decomposition of short windowed discrete Fourier trans-form, the frequency range of different facies is figured out. The form and plane distribution of platform margin reef complex changing with frequency are described. The boundary of lithologic reservoir is confirmed, providing scientific guiding for petroleum exploration.