测井约束地震反演技术在塔河油田碎屑岩储层预测中的应用

Application of log constrained seismic inversion for clastic reservoir prediction in Tahe Oilfield

中国石油化工股份有限公司西北油田分公司勘探开发研究院，新疆乌鲁木齐 830011

Exploration & Production Institute,Northwest Branch Company,SINOPEC,Urumqi 830011,China

塔河油田T759井区白垩系卡普沙良群舒善河组目的层段的砂岩层较薄，砂、泥岩之间的阻抗差异较小，因此不能有效地对砂体进行追踪，给储量计算带来了一定困难。为此，针对该井区目的层段开展了储层测井地震约束反演研究。首先，对T759井区测井资料进行了分析，认为自然电位测井曲线可以较好地区分砂、泥岩;然后，采用精细井震标定、子波提取、初始模型建立、主组分分析、模型估算等方法进行测井约束地震反演，得到舒善河组的自然电位反演数据体，绘制了舒善河组自然电位反演均方根平面图，对砂体的展布特征进行了描述。

The target sand layers in Shushanhe formation of Cretaceous at T759 block in Tahe Oilfield can not be distinguished for the thin sands embedded in mudstones and the tiny P-impedance difference between sands and mudstone.How to get reliable data for reserves estimation has become a difficulty in the exploration.In order to solve the problem,corresponding reservoir seismic constrained inversion methods are studied in the area.Firstly,spontaneous potential is considered as a valid indicator for sands embedded in mudstones based on the log analysis.Then,through the application of reservoir inversion including fine well-to-seismic calibration,wavelet extraction,model initialization,principal component analysis,model parameter estimation and log constrained inversion,the spontaneous potential inversion data cube of Shushanhe formation of Cretaceous at T759 block in Tahe Oilfield is obtained and used for drawing rootmeansquare plane graph of spontaneous potential inversion to predict sandstone distribution.