At present, due to active edge water in BQ57 area of target oilfield, the reserve recovery is low. Therefore, it is necessary to study the remaining oil in BQ57 area to ensure good results in thermal recovery process. The distribution law of remaining oil in vertical and plane of layers III 1 and 3 in BQ57 area is studied. The total remaining oil is 43.22 ×104 t. In the vertical, the geologic reserve of layer Ⅲ11 is 17.76×104 t. The remaining geological reserves are 14.72×104 t. The degree of reserve recovery is 17.19%. The geological reserve of layer III12 is the smallest, which is 5.79×104 t. The remaining oil is also less, which is 4.86×104 t. The degree of reserve recovery is 16.09%. The remaining oil in layer III31 is the largest, which is 15.4×104 t. The degree of reserve recovery is 11.20%. The remaining oil in layer III32 is 8.26 ×104 t and the degree of reserve recovery is 6.17%. On the plane, the proportion of remaining geological reserves channel is 52.87% in underwater distributary. Because its distribution area is largest, the proportion of remaining oil is the highest and the value of reserves abundance is the highest. The proportion of remaining oil in front sand sheet is 44.98%. Its value of reserves abundance is also higher. The latter adjustment of well pattern needs to be combined with the productivity potential of a single well, the underwater distributary channel and front sand sheet should be given priority in the adjustment of well pattern.