Abstract: A method of determining an API gravity of a crude oil is provided. The method includes obtaining a reservoir sample containing the crude oil and heating the sample to a first temperature using an oxidative testing apparatus. The sample is then heated to a second temperature, which is greater than the first temperature, over a period using a fixed heating rate. The rate of carbon dioxide emission from the sample is detected during the period of heating to the second temperature. The peak rate of carbon dioxide emission from the sample is then determined and the peak carbon dioxide emission temperature associated with the peak rate of carbon dioxide emission is also determined. The API gravity of the crude oil in the reservoir sample is determined using an empirical correlation between API gravity and the peak carbon dioxide emission temperature associated with the fixed heating rate.

Abstract: A method of determining an API gravity of a crude oil is provided. The method includes obtaining a reservoir sample containing the crude oil and heating the sample to a first temperature using an oxidative testing apparatus. The sample is then heated to a second temperature, which is greater than the first temperature, over a period using a fixed heating rate. The rate of carbon dioxide emission from the sample is detected during the period of heating to the second temperature. The peak rate of carbon dioxide emission from the sample is then determined and the peak carbon dioxide emission temperature associated with the peak rate of carbon dioxide emission is also determined. The API gravity of the crude oil in the reservoir sample is determined using an empirical correlation between API gravity and the peak carbon dioxide emission temperature associated with the fixed heating rate.

Abstract: A stream including oxygen is provided to a rock sample from a subterranean zone. The rock sample is subjected to a first heating process to thermally oxidize at least a portion of the contaminant present in the rock sample. A first level of total organic content (TOC) of the rock sample is determined based on the first heating process. The rock sample is subjected to a second heating process to thermally oxidize at least a portion of the organic material present in the rock sample. A second level of TOC of the rock sample is determined based on the second heating process.

Abstract: A stream including oxygen is provided to a rock sample from a subterranean zone. The rock sample is subjected to a first heating process to thermally oxidize at least a portion of the contaminant present in the rock sample. A first level of total organic content (TOC) of the rock sample is determined based on the first heating process. The rock sample is subjected to a second heating process to thermally oxidize at least a portion of the organic material present in the rock sample. A second level of TOC of the rock sample is determined based on the second heating process.