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@@Because of lack of the reliable comparison of exploration well data, and there are some confused and unclearly understanding commonly of the characteristics of PUTAOHUA reservoir in Xinzhao region, as well as there is a inconsistent system of evaluation about oil property of reservoir, work of exploration and exploitation about oil and gas are misdirected distinctly. Ignorance of research for reservoir lithology is an important reason of the problem. However, author works out these problems by analysis of petrology-mineralogy and checking of slide under microscopes, with information of 11 wells and 106 samples. Depending on the result of microcosmic analysis, systematical explanation is given about nature of the reservoir, while a discussible estimate is provided about nature of reservoir in this region. Therefore a theory is supplied for the work of exploration and exploitation that would be done in future.