Gas geochemistry has been widely used in search for ore deposits and concealed faults. The collection of qualified soil gas samples suitable for different soil conditions constitutes one of the key factors for the success of the gas geochemical method. Every soil gas collector used in China and abroad can only be suitable for a specific soil environment. Effective methods are lacking for wet clay and soil layers likely to accumulate water. The "soil gas collection twist drill" invented by the authors can solve this problem. With this drill, we can easily collect qualified soil gas samples. Case studies over different types of oil and gas accumulations show that the utilization of soil gas to hydrocarbon analysis can effectively predict underlying oil and gas accumulations.