# Weight Assignment Method and Application of Key Parameters in Shale Gas Resource Evaluation
## 2 Resource Evaluation Methods and Parameters  
Over the past 20 years, domestic scholars such as [PERSON] and [PERSON] [3; 10; 11] have gradually conducted in-depth discussions on the occurrence status, accumulation mechanism, and accumulation conditions of shale gas, and China's shale gas has gradually become a research hotspot. The methods of resource evaluation can be divided into two categories based on exploration, development, production, and operation: static resource evaluation methods and dynamic resource evaluation methods. According to the principles of these methods, they can be further divided into four categories: the genetic method, analogy method, statistical method, and comprehensive method. Each method has its own applicability and limitations. Using multiple methods for shale gas resource evaluation and mutual verification can improve the reliability of shale gas resource evaluation. The genetic method is widely used in the early and middle stages of shale gas exploration and development. It mainly starts from the theory of shale gas generation and estimates the amount of shale gas based on the principle of material balance. The ge  
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netic methods mainly include the basin simulation method, thermal simulation method, geochemical material balance method, kerogen thermal degradation method, etc. These methods all achieve the purpose of quantitatively evaluating shale gas resources through the mechanism of oil and gas genesis [12; 13]. Analogy is often used in the early stages of exploration and is a classic geological idea that is known and speculated to be unknown. Based on the similarity of shale gas reservoir formation conditions between the evaluation area and the analogical area, a resource evaluation method is proposed to estimate the resource abundance and quantity of the unknown (evaluation) area from the known (analogical) shale gas resource abundance [9; 12; 14]. The volumetric method is currently a relatively widely used method in China, mainly aimed at evaluating shale gas resources based on their unique occurrence patterns [15; 16; 17; 18; 19; 20]. The comprehensive method mainly refers to the Delphi method. Due to its comprehensive characteristics, based on multiple methods to calculate the resource quantity of the evaluation area, weights are assigned to the resource quantity calculated using each method according to the actual geological background, data mastery level, and expert experience and understanding, and a more reliable evaluation result is obtained [13] (Table 2). Due to differences in method selection, there are differences and commonalities in the parameters involved in different methods. According to research methods, they can be divided into two types: qualitative research parameters and quantitative research parameters. Due to the different geological conditions in different regions, and based on the principles of hydrocarbon generation, storage mechanisms, and reservoir formation mechanisms, combined with the structural control of a sedimentary environment and diagnosis, a sedimentary environment controls the logical relationship of shale gas reservoir formation. In the selected methods, the importance of different direct parameters is also different. Different methods have multiple common parameters, including structural and sedimentary parameters, specifically the shale area, thickness, density, etc. The specific classification of parameters is as follows (Table 3).