Abstract
Porosity is important in the assessment of gas shale reservoirs and has been widely tested as a basic characteristic of shale. Different test methods were employed to test the porosity, yet inconsistencies were found among the samples, testing methods, and researches in the Longmaxi Formation of the Sichuan Basin. In this paper, in order to determine the source of the inconsistencies, seven test methods are undertaken and the test results are compared intensely. The results show that the inconsistencies are due to sampling variations, test method limits, and sample sizes. It is suggested to test porosity with a relative big sample and by the method capable of covering a broad test range, to reduce the influence of sampling, testing method limit, and sample size. Furthermore, it needs to notice the test protocol, which can introduce unachieved status. Especially the water saturation has significant effect on shale porosity. In addition, the drying-wetting cycles could induce cracks in shale as well; hence, it is important to store the samples carefully, avoiding artificial porosity.
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