Characteristics and Significance of Acid-Soluble Organic Matter in Marine Carbonate Source Rocks

Danting Feng, Xiaofeng Wang (), Wenhui Liu, Dongdong Zhang, Jie Wang, Houyong Luo and Peng Liu
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Danting Feng: State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
Xiaofeng Wang: State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
Wenhui Liu: State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
Dongdong Zhang: State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
Jie Wang: Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
Houyong Luo: State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
Peng Liu: College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China

Energies, 2023, vol. 16, issue 4, 1-14

Abstract: Since the 1950s, major breakthroughs have been made in the field of carbonate oil and gas exploration, and large reservoirs have been found in carbonate strata in many countries; however, the validity of highly evolved carbonate source rocks has been controversial. Because of the loss of organic carbon during acid-solution processing in conventional total organic carbon (TOC) determination, we decided to use a new method of reducing acid-solution losses in order to more effectively quantify acid-soluble organic matter in carbonate rock samples. Different levels of acid-soluble organic matter were present in different types of samples, and there was no positive correlation between the content of acid-soluble organic matter and conventionally measured TOC values. However, the thermal evolutionary maturity of samples with high acid-soluble organic matter content is relatively low, and the high hydrocarbon generation conversion rate of acid-soluble organic matter and conventional TOC in carbonate rocks is an important reason for the low residual TOC in highly evolved carbonate rocks. The new method is helpful in re-evaluating the abundance of organic matter in carbonate rocks and in providing evidence for studying hydrocarbon generation and the hydrocarbon capacity of carbonate source rocks.

Keywords: carbonate rock; source rock evaluation; TOC; acid-soluble organic matter; organic acid salt (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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