|Table of Contents|

Discussion on the Key Issues of Resource Potential Evaluation for Shale Gas(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2012年第03期
Page:
7-16
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Discussion on the Key Issues of Resource Potential Evaluation for Shale Gas
Author(s):
HOU Du-jie1; 2;  BAO Shu-jing3;  MAO Xiao-ping1; 2;  CHEN Xin-jun3;  MA Ning1;  ZHANG Xiao-tao1;  YANG Guang-qing1;  SUN Chao1
1. School of Energy Resources, China University of Geosciences, Beijing 100083, China; 2. Key Laboratoryof Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism of Ministry of Education, China University of Geosciences, Beijing 100083, China; 3. Exploration and Production Research Institute, Sinopec, Beijing 100083, China
Keywords:
shale gas;  resource evaluation;  clay shale;  gas-bearing system;  section;  total organic carbon;  vitrinite reflectance;  recoverable coefficient
PACS:
P618.12; TE122
DOI:
-
Abstract:
According to the review on shale gas, it is believed that shale gas is important additional energy in future, but the development still needed a lot of work; the scholars' outlook on concept of shale gas and resource evaluation method gradually reach unanimity in China, and the evaluating indicators of clay shale focused are mainly total organic carbon, maturity, continuous thickness and content of brittle mineral in clay shale. The concepts of gas-bearing clay shale section and clay shale gas-bearing system were suggested based on the limited definition of shale gas, and the application was more favorable to the resource evolution and development of shale gas. Besides the normal evolution indicator of clay shale, the study on the top and floor of slay shale section and system was very important; the main features of top and floor were introduced, especially the impermeable terrane could seal the gas from clay shale. For the calculation of resource amount of shale gas, the inhomogeneity of hydrocarbon source rock in vertical and horizontal directions should be considered, and the abundance of organic matter of hydrocarbon source rock with different thicknesses was considered with the application of weight coefficient; meantime, a new method to subtly divide the vertical unit of clay shale gas-bearing system was proposed. Because the test methods of adsorbed and free gases were not yet uniform in China, the test results for the same sample were different and the corresponding analysis test standard was shortage, so that a new method for calculating gas content was proposed according to the total organic carbon and hydrogen index of clay shale; the result calculated by the new method might not be very accurate, but it was important under the condition of measurement data with error significantly or shortage. Characteristics of resource evolution of shale gas could include scientificity, rationality, reliability and operability; evaluation method was selected according to the degree of exploration, and classification evaluation was integrated with grade evaluation. The relation diagram between recoverable coefficient and the product of vitrinite reflectance and total organic carbon was recommended to predict the recoverable coefficient.

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Last Update: 2012-09-20