论文部分内容阅读
麦盖提斜坡西段群苦恰克地区钻井揭示石炭系小海子组发育高能滩沉积,并在群苦恰克以南地区发现大规模的异常地震响应特征。为了探索这些异常地震响应特征的地质属性,根据钻井、地震及区域地质资料,探讨了小海子高能滩发育时期的沉积环境,指出斜坡西段小海子组为碳酸盐岩缓坡沉积模式,发育内缓坡、中缓坡和外缓坡相。在沉积相研究的基础上分析各沉积相带的地震相特征,并对异常地震响应特征进行综合描述和解释,有效预测了高能滩的空间展布规律。研究结果表明:高能滩具有反射时间厚度异常增厚和振幅减弱2大典型反射特征,形成了叠瓦状反射、透镜状反射、低频弱反射和波状—串珠状反射4种地震响应,高能滩沿着中缓坡厚度变化带呈NEE向带状展布,具有较大的分布范围和规模。
Drilling in the Kuchak region in the western segment of the Margaret slope reveals that the Carboniferous Xiaohaizi Formation developed high-energy beach deposits and discovered large-scale anomalous seismic response characteristics in the south of Qunqiakake. In order to explore the geologic properties of these anomalous seismic responses, the sedimentary environment of the Xiaoyizi high-energy beach was discussed based on drilling, seismic and regional geological data. It is pointed out that the Xiaohaizi Formation in the west section of the slope is a gentle-sedimentation model of carbonate rocks, Gentle slope, gentle slope and outer gentle slope phase. Based on the study of sedimentary facies, the seismic facies characteristics of each sedimentary facies belt are analyzed, and the characteristics of anomalous seismic response are comprehensively described and explained, which effectively predict the spatial distribution of high-energy beach. The results show that the high-energy beach has two typical reflection characteristics, such as anomalous thickness thickening of the reflection time and amplitude weakening. Four kinds of seismic responses such as shingle-like reflection, lenticular reflection, low-frequency weak reflection and wavy- The change of thickness of medium slope is distributed in NEE band, with a large distribution range and scale.