In view of the fact that there aren’t any physical property interpretation criterions of the valid gas grit available and the needs of the calculation of reserves and the geology model building, in the case of collating and stipulating the different kinds of the gas grits once more, the authors adopt the gas testing method, the gas and oil occurrence method and the experience method of average, from different angles to ensure the physical property interpretation criterions of the gas bearing formation thickness, and refer actual flow condition to gain the physical property interpretation criterions of the different kinds of gas grits in Lamadian oilfield.oft-com:office:office" />