二连盆地白北凹陷白垩系下统地震相特征

为使用地震相特征解译沉积分布规律，寻找优质储层。文章通过对地震剖面振幅、连续性、同相轴特征的研究分析，将白垩系下统地震相分为：①中弱振幅低连续性楔形充填；②中弱振幅中连续性楔形充填；③中振幅中高连续性楔形充填；④杂乱反射充填；⑤强振幅中高连续性席状充填；⑥中振幅中连续性席状充填等六种反射构型，并给出相应的识别标志、平面分布范围。分析认为中弱振幅低连续性楔形充填多发育在西部次洼周缘及南部斜坡带；中弱振幅中连续性楔形充填呈北西-南东向展布；中振幅中高连续性楔形充填由盆地边缘向内部延伸；杂乱反射充填处于紧邻断裂带下降盘一侧；强振幅中高连续性席状充填分布于凹陷湖盆中心区域；中振幅中连续性席状充填主要分布于湖盆中心区域，展布面积相对于强振幅中高连续性席状充填更大。

Seismic facies characteristics of Lower Cretaceousin Baibei Sag, Erlian Basin

The purpose of this paper is to use the characteristics of seismic facies to interpret the law of sedimentary distribution and look for high-quality reservoirs. In this paper, through the study and analysis of the characteristics of amplitude, continuity and in-phase axis of seismic section, the lower Cretaceous seismic facies are divided into: 1 medium-weak amplitude and low continuity wedge filling; 2 medium-weak amplitude medium-continuity wedge filling; 3 medium-high amplitude medium-high continuity wedge filling; 4 random reflection filling; 5 strong amplitude medium-high continuity sheet filling; (6) there are six reflection configurations such as continuous sheet filling in medium amplitude, and the corresponding identification marks and plane distribution range are given. The analysis shows that the medium-weak amplitude and low-continuity wedge filling is mostly developed in the western subdepression periphery and the southern slope belt, the medium-weak amplitude medium-continuous wedge filling extends from the edge of the basin to the interior, and the chaotic reflection filling is located on the side of the falling plate of the fault zone, and the medium-high continuous wedge filling with strong amplitude is distributed in the center of the sag lake basin. The continuous sheet filling in the middle amplitude is mainly distributed in the central area of the lake basin, and the distribution area is larger than that in the medium and high amplitude.