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为了对相变迅速、砂体横向变化大的陆相地层进行等时砂体对比,并对有利砂体的展布规律进行较为精确的评价和预测,以川西坳陷新场-丰谷地区上三叠统须家河组四段为例,提出了等时格架及地震反演双重约束的精细砂体对比方法.通过建立砂体对比的等时地层格架,利用单井岩性、沉积特征及测井、三维地震资料,进行砂组划分与对比,结合等时地层格架约束的地震反演进行精细砂体对比.结果表明:沿辨状主河道的FG21—CF125井一带可识别出19套砂体,多呈透镜状分布,其两侧可识别的砂体为11套或更少,有多套砂体的缺失.相比较传统的“砂对砂,泥对泥”的对比方式,能确保5~8 m的砂体对比不串层,有效性分析表明砂体对比的结果是可信的.
In order to compare isochronal sand bodies with rapidly changing facies and large horizontal lateral variation of sand bodies, and to conduct a more accurate evaluation and prediction of the distribution laws of favorable sand bodies, the new field-Fenggu area in the western Sichuan depression Taking the fourth member of the Xujiahe Formation in the Triassic as an example, the authors propose a method of contrasting the fine sand body with the dual constraint of isochronal framework and seismic inversion.By establishing the isochronal stratigraphic framework of sand body correlation, Sandstone group division and contrast, combined with the seismic inversion constrained by the isochronal stratigraphic framework, the fine sand bodies are compared.The results show that the fine sand bodies along the main channel of the main channel identified as well can be identified as FG21-CF125 19 sets of sand body, mostly lenticular distribution, on both sides of the sand body can be identified as 11 sets or less, the lack of sets of sand bodies. Compared to the traditional “sand on the sand, mud on the mud” In contrast, it can ensure that sand bodies of 5 ~ 8 m are not stratigraphic contrast and validity analysis shows that the result of sand body comparison is credible.