Characteristics and Significance of Acid-Soluble Organic Matter in Marine Carbonate Source Rocks
Author:
Feng Danting1ORCID, Wang Xiaofeng1, Liu Wenhui12, Zhang Dongdong1, Wang Jie2, Luo Houyong1, Liu Peng3
Affiliation:
1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China 2. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China 3. College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
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.
Funder
the National Nature Science Foundation of China Major special projects of Changqing Oilfield
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction
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