论文部分内容阅读
本区山2段储层是天然气主要的产层之一,地质沉积为三角洲平原分流河道沉积。地震反射由于受山西组山1段煤层的位置和厚度影响,造成在不同井区(相带),山2段地震反射特征存在显著差异,而山2段砂泥岩的波阻抗差异微弱,两种因素的叠加影响,使得山2段地震属性与岩性和沉积相带之间的相关性极差,这些的确为地震储层预测带来了很大的困难。针对复杂的沉积环境以及下伏煤层的干扰,通过对原始数据进行小波变换,充分利用地震的高频信息去除煤层干扰对山2段砂体预测,取得了很好的成果。应用高频衰减低频增加的原理,提取山2段的吸收属性预测含气性,通过钻井验证取得了满意的效果。
Reservoir 2 in this area is one of the major natural gas reservoirs. Geological sedimentation is distributary channel sedimentation in delta plain. Seismic reflection is affected by the location and thickness of seam 1 in Shanxi Formation, resulting in significant differences in seismic reflection characteristics in different well zones (facies belts) and Shan 2 Member. However, the wave impedance difference of Shan 2 Member sand shale is weak. The superposition of factors makes the correlation between Shan 2 seismic attribute and lithology and sedimentary facies very poor, which indeed brings great difficulties for the prediction of seismic reservoirs. According to the complex sedimentary environment and the interference of the underlying coal seam, good results have been obtained by performing wavelet transform on the original data and making full use of the high frequency information of the seismic to remove the coal seam disturbance on the sandbody of the Shan 2 Member. Applying the principle of increasing high frequency attenuation and low frequency to extract the absorption properties of Shan 2, the gas content is predicted, and satisfactory results are obtained through drilling verification.