利用土壤地球化学数据和BP神经网络预测松嫩平原油气资源

基于东北地区多目标区域地球化学调查获得的海量土壤地球化学数据,利用BP神经网络模型,在土壤地球化学性质与油气田空间位置之间建立模型,构造最优的油气资源预测模型. 以土壤54项地球化学指标以及XY坐标值共同作为模型输入层,以样本是否在油气田内(1代表油气田内,0代表油气田外)作为模型输出层,基于随机抽取的油气田内和油气田外各500个土壤样本数据进行模型训练. 结果显示,多次训练后识别准确率保持在90%左右,说明该模型分类效果较好,可用于油气资源预测. 利用该模型获得了松嫩平原11 291个土壤样本的含油气概率,并绘制了油气资源预测图. 研究表明,神经网络对于解决复杂的非线性地质问题可以发挥重要作用.

PREDICTION OF OIL-GAS RESOURCES IN SONGNEN PLAIN BASED ON SOIL GEOCHEMICAL DATA AND BACK-PROPAGATION NEURAL NETWORK

Based on the massive data obtained from the multi-target regional geochemical survey in Northeast China, the back-propagation(BP) neural network is used to establish the model between soil geochemical property and spatial location of oil-gas fields, and construct the optimal prediction model of oil-gas resources. Taking both the 54 soil geochemical indexes and XY coordinate values as input layer of the model and whether the samples are inside the oil-gas fields (1 for inside, 0 for outside) as output layer, the study carries out the model training based on the data of each 500 soil samples randomly selected from inside and outside the oil-gas fields. The results show that the recognition accuracy remains at about 90% after repeated training, indicating that the model has good classification effect and can be used for prediction of oil-gas resources. The hydrocarbon-bearing probability of 11 291 soil samples from Songnen Plain is obtained by using the model, and then the prediction map of oil-gas resources is drawn. The study shows that neural network can play an important role in solving complex nonlinear geological problems.