论文部分内容阅读
济阳坳陷罗家地区沙三段下亚段泥页岩油气藏具有较大的勘探潜力,预测其有机碳含量分布特征是油气勘探的关键。针对传统的实验室测定有机碳含量方法存在的采样少、成本高等问题,提出了利用地球物理技术预测泥页岩油气藏有机碳含量分布的方法。该方法在泥页岩岩石组分划分的基础上,利用富含有机碳的泥页岩低密度、低速度的物理特征,推导了单井定量估算有机碳含量的计算公式,验证了低波阻抗对于有机碳含量的敏感响应关系;并利用井、震联合反演方法预测了有机碳含量平面展布特征。该方法在罗家地区沙三段下亚段泥页岩有机碳含量预测中取得了较好的应用效果,预测的有机碳含量相对误差最大为22%,最小为0.04%,平均小于9%。
The shale oil and gas reservoirs in the lower third member of Shahejie formation in the Luojia area of Jiyang Depression have great potential for exploration. Prediction of the distribution of organic carbon content is the key to oil and gas exploration. In order to solve the problem of low sampling and high cost of traditional organic carbon determination in laboratory, a method of using geophysical techniques to predict the distribution of organic carbon in shale reservoirs is proposed. On the basis of the division of shale rock components, this method derives the calculation formula of single well quantitative organic carbon content by using the low density and low velocity physical characteristics of shale rich in organic carbon, and verifies the low impedance And the sensitive response to the organic carbon content. The well-seismic combined inversion method was used to predict the planar distribution of organic carbon. The method has achieved good results in predicting the organic carbon content of shale in the Lower Member of the Third Member of Shahejie Formation in Loess area. The relative error of predicted organic carbon content is 22%, the minimum is 0.04% and the average is less than 9%.