频率信息在碳酸盐岩礁滩储层含油气性预测中的应用

根据礁滩相储层的特点及礁滩反射波的特征解释出礁滩的基本分布，利用不同形式的频率信息预测储层的分布。首先阐述影响地震波频率变化的主要因素，然后，利用频率信息识别礁滩储层含油气的可行性，选取表征频率特性的几个主要参数：单低频、主频、频率衰减梯度、高低频能量比和瞬时频率。LY 地区气藏属于碳酸盐岩礁滩相岩性油气藏，具有埋藏深、油气分布不均匀的特点。通过对LY 地区油气储层预测及研究表明，利用不同形式频率信息刻画礁滩相油气储层分布与钻井吻合、频率信息可以很好地刻画储层横向的变化，从而证实了充分利用不同形式频率信息识别油气分布的良好前景。

Application of frequency information to the prediction of hydrocarbon potential in carbonate reef flat reservoirs

Based on the characteristics of reef flat reservoir and its distribution interpreted by the seismic reflection features, various forms of frequency information are applied to predict the reservoir distribution. The main influencing factors for the change of seismic wave frequency are expounded, and the practicability for identifying the hydrocarbon potential in carbonate reef flat reservoirs by frequency information is analyzed. Several parameters which could display the frequency features are selected, including single low frequency, dominant frequency, frequency attenuation gradient, high-low frequency energy radio and instantaneous frequency. As a kind of carbonate reef flat lithologic reservoir, the gas reservoir in LY area is characterized by deep burial depth and nonuniform oil and gas distribution. The application shows that the result of oil and gas distribution prediction by using different frequency information is consistent with drilling data, and the reservoir lateral variation could be well reflected.