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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/09282221129
Recovering original type and abundance of organic matter in spent source rocks: A review and advances in elemental proxies
Wenyao Xiao,1 Jian Cao,2 Bing Luo,3 Yuce Wang,4 Di Xiao,5 Chunhua Shi,6 and Kai Hu7
1State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, China; [email protected]
2State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, China; [email protected]
3Research Institute of Petroleum Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu, Sichuan, China; [email protected]
4State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, China; [email protected]
5State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, School of Earth Science and Technology, Southwest Petroleum University, Chengdu, Sichuan, China; [email protected]
6State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, China; [email protected]
7State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, China; [email protected]
ABSTRACT
Recovering the original organic matter properties (e.g., organic matter type and abundance) of source rocks during high maturation to overmaturation (spent source rocks) is the foundation for accurately understanding their original hydrocarbon generation potential
, but it is extremely challenging due to the lack of effective proxies. In this paper, the research status of this field is systematically reviewed, and it is found that a series of evaluation methods proposed meet critical challenges, due to the harsh conditions, complicated calculation, uncertainty of parameter setting, high test cost and limited application, and more. In contrast, inorganic elemental geochemical methods show unique advantages. Based on a case study in the overmature source rocks of the lower Cambrian Qiongzhusi Formation in the intracratonic rift of the Sichuan Basin, South China, the recovery model was established by the element geochemistry method. These data, combined with organic geochemical data, such as RockEval pyrolysis parameters and measured total organic carbon contents, were
used
to determine the original total organic carbon contents based on an improved mass balance model. Based on further comparison with existing examples, the general recognition is summarized. The inorganic geochemical method is able to reliably determine the original hydrocarbon generation
potential
, but the applicability of the elemental proxies needs to be carefully considered, and the corresponding indexes should be selected according to the depositional setting of the source rocks. This would allow accurate evaluation of conventional hydrocarbon resources and prediction of unconventional shale oil or gas sweet spot reserves.
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