Abstract
Brittleness is very important in the fracability evaluation and exploration of unconventional oil and gas. In this paper, the rock mechanics parameter method and the mineral composition method are used in order to calculate the brittleness index in Chang 7 reservoir in Longdong area in Ordos basin. The results show that the brittleness index calculated by rock mechanics parameters is 44.9%-62.23% and by mineral composition method is 52.5%. The brittleness indexes calculated by the two different methods are not greatly different, and the overall brittleness index is high, which indicate Chang 7 reservoir in Longdong area has high brittleness and good fracability.
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