塔河油田三叠系储层地震正演模拟及应用研究

塔河油田三叠系储层具有横向非均质性,储层地震响应特征复杂,储层预测多解性严重,钻井的成功率偏低,急需找到碎屑岩储层的敏感属性,提高解释的准确性。根据测井、钻井、测试资料建立三叠系砂岩储层模型,采用非均匀介质条件下导出的二维声波波动方程交错网格有限差分格式,参照野外数据采集系统,对砂岩储层模型进行了数值模拟正演计算。对共炮点记录进行常规处理,得到叠加和偏移剖面。分析尖灭砂体的地震响应特征,确定了均方根振幅和振幅变化率等地震属性为含油气储层敏感参数。并建立了湖底扇储集体概念化地震地质模型,减少了预测的多解性和局限性,可为地震解释提供科学依据。

Research and Application of Seismic Forwared Modeling of Triassic Reservoir in Tahe Oilfield

In Tahe Oilfield,there existed lateral heterogeneity,seismic response characters were complex,reservoir prediction was serious multiplicity and low drilling success ratio in Triassic reservoirs,to find out the sensitive attribute of clastic rock reservoirs was badly needed for improving the interpreting accurate.A model for Triassic sandstone reservoirs was established based on well logging,drilling and testing data,the staggered finite difference of 2D acoustic wave equation derived under heterogeneous condition was used for forward calculating the sandstone reservoir by using field data acquisition system.The CMP record was processed by conventional flow,and stacked and deviated sections were obtained,the response characters of pinchout sand bodies are analyzed,the seismic attributes such as root-mean-square amplitude and its variation are determined as sensitivety parameters of oil and gas reservoirs,a concept seismic-geologic model of sublacustrine fan reservoir is established,by which the multiplicity and limitation are reduced for prediction,a basis is provided for seismic interpretation.