Well preserved brachiopods and other taxonomically diverse fossils have been for the first time found from a depth of more than 1700 m of the Durbod 101 borehole in the interior of the central depression of the Daqing prospect area. Study of these fossils have affirmed that those brachiopods belong to the Beishan type group widespread in the Tianshan-Hinggan depositional region during the Early Permian, thus making certain that the normally deposited marine Lower Permian does exist beneath the extensive Mesozoic strata in the Daqing prospect area and showing that the basement of the northern part of the Songliao basin is the Hercynian shallow folded basement. This discovery not only has great significance in the in-depth study of the mechanism of the basement structure and biopalaeogeographic changes as well as other theoretical problems, but also provides ac-tual evidence for the development of deep hydrocarbon exploration in the Daqing prospect area and the search for the follow-up hydrocarbon horizons. Therefore, the departments concerned should pay attention to hydro-carbon exploration of Upper Paleozoic strata.