基于等时相控反演的致密砂岩储层地震识别方法

在研究区扶余油层划分出5个中期旋回、16个短期旋回，建立高频等时地层格架，并通过层位标定、小层对比建立井震格架； 在此基础上，分析研究区高频等时地层格架下各个短期旋回的测井相模式及沉积相，认为该区沉积相为介于经典曲流河与经典网状河之间的河流类型； 在高频等时地层格架下建立相控砂泥岩模型，应用模型约束叠前地震数据进行相控反演，依据相控叠前反演结果进行储层预测，形成了基于等时相控反演的致密砂岩储层地震识别方法，较好地解决了本区叠置砂体预测问题，在反演剖面上后验井2m以上砂岩刻画清晰，1～2m砂岩在反演剖面上也有响应。

Tight sandstone reservoir identification based on isochronal phase-controlled inversion

5 mid-term and 16 short-term cycles are recognized from Fuyu oil beds in the study area, and a high-frequency isochronal stratigraphic framework and well-to-seismic framework are also built by horizon calibration and sub-bed correlation. On this basis, this paper analyzes log facies mode and sedimentary facies of each short-term cycle under the high-frequency isochronal stratigraphic framework in the area. It can be assumed that the sedimentary facies belongs to a river type between classical meandering rivers and anastomosing rivers. Then a phase-controlled sand shale model is also built under the high-frequency isochronal stratigraphic framework. A phase-controlled inversion on model-constrained prestack seismic data is carried out and reservoirs are predicted on results of phase-controlled prestack inversions. Tight sandstone reservoir seismic identification based on isochronal phase-controlled inversions is formed, which is very helpful for superposed sand body prediction in the area. Inversion sections show clear sandstone with the thickness more than 2m in posterior wells and sandstone responses with the thickness between 1~2m.