圈闭地质评价是从地质角度对圈闭的含油气进行分析，并将一系列定性、定量地质因素科学地用于地质评价，最终得出圈闭含油气的可能性。本文在综合分析前人方法的基础上，提出了利用人工神经网络中的误差回传神经网络（Back－propagationneuralnetwork）进行计算的方法，简称B－P算法。实践证明，此方法特点明显，有较高的实用价值。 The trapping geological evaluation is to analyze the trapped oil and gas from a geological point of view, and to apply a series of qualitative and quantitative geological factors to the geological evaluation scientifically. Finally, the possibility of trapping oil and gas is obtained. Based on the comprehensive analysis of previous methods, this paper proposes a method using artificial neural network error feedback neural network (Back-propagation neural network) for calculation, referred to as B-P algorithm. Practice has proved that this method has obvious characteristics and high practical value.