The hydrogen index (HI) of a potential source rock is 500. If 400 g of the same rock produces 6000 mg of hydrocarbons during a thermal pyrolysis at the maximum temperature, the calculated total organic content (TOC) of the rock is ____________ weight % (rounded off to one decimal place).
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Correct Answer: 2.9
Solution and Explanation
- Weight of hydrocarbons produced = 6000 mg = 6 g
- Weight of rock sample = 400 g
Substitute the values into the equation: \[ TOC = \frac{6}{400} \times 100 = 1.5% \] Thus, the total organic content (TOC) of the rock is 1.5 weight %. Final Answer: 1.5
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