Abstract
Present simulation results based on two-dimensional basin cannot obtain accurate evaluations of petroleum resources because of not combining the thermal history in the Dongpu Depression. In this paper, Shahejie 3 Formation source rocks are evaluated using the geochemical data, and based on the thermal history, the thermal maturity evolution of typical wells and the top and bottom of the Shahejie 3 Formation source rocks are modeled using BasinMod software. Results show that source rocks are mainly distributed in the Haitongji-Liutun and Qianliyuan areas, and dominated by medium to high maturity source rocks. Organic matter types are primarily types II and III kerogen with a small amount of type I. The Shahejie 3 Formation source rocks in the Menggangji area experienced two stages of hydrocarbon generation: (1) during the Dongying Formation depositional period (33–17 Ma) and (2) from the Minghuazhen Formation depositional period to present (5.1–0 Ma). The source rocks are generally underdeveloped with low potential for hydrocarbon generation due to nonpoor and thin source rocks in this area. The two stages of hydrocarbon generation are not obvious for other areas. When the bottom of the source rocks reached overmature stage, the mid-lower Shahejie 3 Formation experienced the peak of hydrocarbon generation during the Dongying Formation depositional period. The thermal maturity evolution of the Shahejie 3 Formation source rocks revealed that the main hydrocarbon generation period was during the Dongying Formation depositional period. Therefore, petroleum exploration is suggested to be performed at the Shahejie 3 Formation source rocks in the Qianliyuan and Haitongji-Liutun areas to study the lithology and discover complex petroleum reservoirs in the Dongpu Depression.
Highlights
The net oil imports of China increased by 10.1% to a record high of 29.4 Â 108 bbl in 2017, accounting for 68.4% of the total petroleum consumption (Wang et al, 2018)
The Shahejie 3 Formation source rocks in the Dongpu Depression were evaluated based on the organic matter type, organic matter abundance, maturity, chloroform bitumen “A,” and dark mudstone distribution
The mature hydrocarbon generation history of source rocks is one of the important factors in the study of petroleum reservoir dynamics, and it determines the key period of oil and gas filling and oil and gas enrichment area
Summary
The net oil imports of China increased by 10.1% to a record high of 29.4 Â 108 bbl in 2017, accounting for 68.4% of the total petroleum consumption (Wang et al, 2018). By 2015, Dongpu Depression have found more than 3.96 Â 1011 m3 gas reserves and 33.86 Â 108 bbl oil reserves (Tan et al, 2017). This obviously became a promising area for petroleum exploration. To solve the problem of the rapid decline in petroleum production, it is of great significance to explore petroleum in deep strata such as the Shahejie 3 Formation that has a burial depth of more than 3500 m (Liu et al, 2017). Further studies are needed to evaluate the petroleum resource potential, especially the resource distributions in deep strata such as the Shahejie 3 Formation, in the Dongpu Depression
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