Hydrocarbon generation and expulsion quantification and hydrocarbon accumulation contribution of multiple source beds in Yanchang Formation, Ordos Basin
Received date: 2021-04-09
Revised date: 2021-05-11
Online published: 2021-10-21
Supported by
The National Science and Technology Major Project of the Ministry of Science and Technology of China(ZX201705001)
the Technology Project of Exploration and Development Research Institute of Changqing Oilfield Company, PetroChina(2019-168)
There are several sets of source rocks in Yanchang Formation of Mesozoic in Ordos Basin. At present, Chang 7 source rock is considered to be the main source rock of Yanchang Formation, but there is a lack of evaluation methods for hydrocarbon generation and expulsion of other source rocks and hydrocarbon accumulation contribution of source rocks. By means of basin simulation and based on a large number of basic geological data and exploration results, the geological body model and thermal history model are established to carry out the simulation research on hydrocarbon generation and expulsion and accumulation of multi-source layers in Yanchang Formation under geological constraints. The results show that the hydrocarbon generation conversion rate of each source rock in Yanchang Formation is mainly distributed in 45%-75%, which still has great hydrocarbon generation potential and has the geological conditions for the in-situ exploitation of shale oil. At present, the accumulative hydrocarbon generation is 123.3 billion tons and hydrocarbon expulsion is 90 billion tons, which is dominated by heavy hydrocarbon of . The hydrocarbon generation period and hydrocarbon expulsion period were concentrated in the Early Cretaceous, accounting for 68%-82% of the total hydrocarbon generation and expulsion amount. The simulation of hydrocarbon accumulation revealed that there was only a small amount of hydrocarbon charging in each layer of Yanchang Formation before the deposition of Cretaceous, and the early Cretaceous was the key period of hydrocarbon charging and accumulation. The upper and lower hydrocarbon source layers are characterized by “near source accumulation”, and the basin simulation results are in good agreement with the proven oil reservoirs and the predicted distribution range of oil reservoirs. The study proposed for the first time that the model of “Chang 7 main source rock multi-layer three-dimensional exploration” will be extended to the model of “multiple source rock near-source accumulation” to boost the exploration of shale oil and new layers in the Yanchang Formation of Mesozoic in the Ordos Basin.
Jingwei CUI , Zhongyi ZHANG , Jianliang LIU , Guanglin LIU , Xiu HUANG , Yalin QI , Zhiguo MAO , Yang LI . Hydrocarbon generation and expulsion quantification and hydrocarbon accumulation contribution of multiple source beds in Yanchang Formation, Ordos Basin[J]. Natural Gas Geoscience, 2021 , 32(10) : 1514 -1531 . DOI: 10.11764/j.issn.1672-1926.2021.05.011
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