川东北元坝地区长兴组生物礁滩体系分频特征研究

Spectral decomposition characteristics of reef-bank reservoirs of Changxing Formation in Yuanba area, northeastern Sichuan Basin

许永哲 王玉华 陈雷 陆永潮

Xu Yongzhe Wang Yuhua Chen Lei Lu Yongchao

中国地质大学(武汉) 构造与油气资源教育部重点实验室,武汉 430074 朝鲜金策工业综合大学 资源探测学院,朝鲜 平壤 内蒙古自治区 第四地质矿产勘查开发院 技术部,乌兰察布 012000

Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan, Hubei 430074, China Faculty of Earth Resources and Survey, Kim Chack University of Technology, Pyong Yang, DPRK Inner Mongolia Fourth Geological Mineral Exploration Institute, Wulanchabu, Inner Mongolia 012000, China

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 transform, 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.

https://doi.org/10.11781/sysydz201306651