The Research On The Methods And Theories Of Estimation For Coalgas Resources And Reserves

As the existing conflicts between the consumption and supply of the conventional oil and gas will be inevitably aggravated, many countries have devoted their attentions into the development of unconventional energy sources such as coalgas, tar sands, water solution gas as well as oil shales, and have achieved considerable economic and social benefits. In order to promoting the estimation and appraisal of Chinese coalgas resources and reserves, this dissertation illustrates systematically coalgas reserves estimation methods and their applications which considered China's special geological setting for coalgas reserves. Especially, this dissertation put forward a new reserves estimation technique named "coalgas well controlled method". The achievements and conclusions by this dissertation are listed as following:i. The technical framework for Chinese coalgas resources and reserves estimation methods has been built, and also a comprehensive classification system on coalgas resources and reserves has been established. In order to keeping the reasonability of coalgas resources and reserves, the current technical and economical conditions should be well considered, particularly, the drilling information, production tests and developing plan.ii. A new technique named "coalgas well controlled method" for coalgas reserves estimation has been put forward which can be regarded as the most suitable method during the stage of exploration. This method balances particularities of coalgas reservoir as a solid reservoir as well as a fluid reservoir.iii. Rules about the acquisition of various parameters for the "coalgas well controlled method" are presented in detail. What's more, the basic methods for technical and economic recoverable reserves are also introduced. These provide a firm foundation for new standard of coalgas reserves estimation work in China.iv. A comprehensive appraisal method has been built, which bring some help in the work of optimal prospecting area choosing, economic recoverable reserves calculation as well as the economic evaluation work for coalgas projects.v. Coalgas reserves estimation in ZZ Block of Qinshui basin has been done using the "coalgas well controlled method". This study will provide a good referential case in coalgas reserves estimation and appraisal in China.