博兴洼陷樊1断块沙四上亚段滩坝砂体预测

Prediction of beach and bar sand body in the upper of the fourth Member of Shahejie Formation of Fan 1 fault block in Boxing Depression

文中提供了一种薄互层滩坝砂体预测方法,即在谱反演方法提高地震资料分辨率的基础上,通过储层精细标定明确地震响应特征,利用均方根振幅属性识别滩坝砂体分布范围;然后结合低频属性及频谱衰减属性,进一步刻画较厚的滩坝砂体空间展布。并对博兴洼陷樊1断块沙四上亚段砂厚、砂地比、均方根振幅属性、20 Hz分频属性、频谱衰减属性等特征综合研究分析,进而刻画其沉积相及主力砂体展布特征。研究结果表明:研究区目的层坝砂有利砂体主要分布在fan169井—fan1井—fan116井—fan9井,以及chun113,fan159井一带,滩坝砂体预测结果与实钻情况的符合率达80%左右。研究成果对该区下一步的勘探开发起重要指导作用。

This paper provides a sand body prediction method of thin interbedded beach dam,that is:On the basis of improving the resolution of seismic data by spectral inversion,this paper defines the seismic response characteristics of reservoir through fine reservoir calibration,and identifies the distribution range of beach and bar sand body by using the root mean square amplitude attribute.The combination of low frequency attribute and spectrum attenuation attribute can further depict the space distribution of the beach and bar sand body.The distribution characteristics of the sedimentary microfacies and main sand bodies map in the upper of fourth Member of Shahejie Formation of Fan 1 fault block in Boxing Depression were studied by means of sand thickness,net-to-gross ratio,root mean square amplitude attribute,20 Hz low frequency attribute and spectral attenuation attribute.The results show that the favourable bar sand in study area is mainly distributed in the area of fan169-fan1-fan116-fan9 well,and Chun113,fan159 well,and the predicted results are 80%consistent with the actual drilling situation,which has an important guiding role for the next exploration and development.