地层密度估算及其应用

Estimation and application of formation density

中国石化石油勘探开发研究院南京石油物探研究所 江苏南京210014

Institute of Geophysical Prospecting,SINOPEC Research Institute of Petroleum Exploration and Development, Nanjing 210014, China

目前在进行储层预测和油气藏描述时,一般多采用地震反演技术,计算层速度,预测孔隙度、渗透率、饱和度等多种储层参数,进而获得储层的横向变化规律,达到预测油气的目的。然而,由于同一地震参数受多种地质因素影响增加了地质解释的多解性,以及由于在利用地震资料求取储层参数时,各参数间有一定的相关性,从而影响了预测效果。为此提出了一种从地震资料中提取地层密度参数的方法,以提高油气预测效果。本方法是应用AVO技术,在大于30°角的范围内结合密度测井资料反演地层密度参数。应用此方法对实际资料进行了试算,取得了一定的效果。

It is common practice to estimate reservoir parameters such interval velocity, porosity, permeability, and saturation with seismic inversion techniques during the reservoir prediction and reservoir characterization. The resulting parameters can be used to further infer lateral variability of reservoir parameters and hydrocarbon potential. However, a seismic attribute suffers from various geological factors resulting in non unique geologic interpretation. The prediction effect is also affected by the relativity between different seismic attributes. This paper presents amethod that extract formation density from seismic data to improve the prediction effect for oil and gas. In combination with density logging data, thismethod estimate formation density through applying AVO technique in case of formation dip greater than 30 degrees. Desired results have reached by applying themethod to real data.