▼ Petroleum industry is always one of the major concerns in everyone's daily life. In recent years, people paid even more attention to the field because human beings are faced with the severe problem of short in oil, or energy resource in general. This paper discuss a specific question on how to category solid carbonate matters in gas-producing shale plays and the reason for the classification. This paper contributes to a better understanding on how oil/gas is stored in shale layers. The goal is to draw a conclusion on whether solid carbonate matters should be considered a portion of pore spaces or rock matrices. Analyzing loggings and other formation evaluation methods are used. Advisors/Committee Members: Ebenhack, Ben.