Abstract:

Shale gas and shale oil are petroleum generated and accumulated in source rocks. They are remained oil and gas in source rocks. The gas remained in source rocks mainly adsorbed by organics or free in pore. Shale gas survey, exploration and development have just started in China. In oil and gas basins, we can find oil and gas exploration and development data to help us to get the data such as TOC, Ro, thickness, distribution, oil and gas showings of source rocks etc. In the basins that have not found conventional oil and gas, we lack  the basic data needed for evaluating the shale gas. The availability of basic data in different basins needed for evaluating shale gas and shale oil is different, so the starting point and indexes used for shale gas(oil) geological evaluation are different: (1) gas shale evaluationmainly use the TOC, Ro, mineral composition, shale distribution, thickness, burial depth, heterogeneity, etc.; (2) gas content evaluation and shale gas resources assessmentmainly use the gas content, adsorption ability, the types of reservoir space and reservoir physical properties, fractures and resource potentials, etc.; (3) shale gas development and economics evaluationmainly use the reservoir temperature, fluid pressure, fluid saturation, fluid properties, reservoir sensitivity, rock mechanics parameters and regional stress field, geomorphology, infrastructure, etc. Economic evaluation is based on test well.

Key words: shale gas, evaluation parameters, resources evaluation, geologic evaluation, favorable exploration areas