Recovery method of original TOC and its application in source rocks at high mature-over mature stage in deep petroliferous basins
Pang Xiongqi1,2, Li Qianwen2, Chen Jianfa1,2, Li Maowen3, Pang Hong1,2
1 State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249 2 Basin & Reservoir Research Center, China University of Petroleum(Beijing), Beijing 102249 3 Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083
Abstract：According to the change of residual hydrocarbon generation materials in the evolution process of source rocks,the geological conceptual model about the TOC recovery was restored, so it proposed a quantitative pattern between TOC evolution and the main controlling factors. Then through giving a certain value for each factor that calculated the TOC recovery coefficient, the TOC evolution charts for muddy source rocks and carbonate source rocks in the case of different kerogen types were made. The main characteristic of this method was able to avoid the deviation that subjective factors and physical simulation experiment conditions might lead to.The results were as follows:With the increasing of thermal evolution level,the residual TOC in source rocks reduced gradually in large hydrocarbon expulsion stages(RO=0.5％～2.0%); the reduction amount was biggest for source rocks in high mature-over mature stage(RO>1.2%); the recovery coefficient gradually increased with the increasing of RO. The TOC recovery coefficients can respectively reached to 3.0,2.0, and 1.4 for muddy source rocks in case of kerogen types Ⅰ, Ⅱ, and Ⅲ;for carbonate source rocks,the TOC recovery coefficients were respectively 3.2,2.2, and 1.5. The practical applications of TOC recovery were exemplified in field.
Pang Xiongqi,Li Qianwen,Chen Jianfa et al. Recovery method of original TOC and its application in source rocks at high mature-over mature stage in deep petroliferous basins[J]. JOPC, 2014, 16(6): 769-789.
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