Differential hydrocarbon accumulation process of heavy oil reservoirs in Sanhecun sag of Jiyang depression

doi:10.3969/j.issn.1672-7703.2018.06.008

Abstract

Abstract: As a number of heavy oil reservoirs have been discovered in Paleogene and Neogene of the Sanhecun sag, Jiyang depression, Bohai Bay Basin, it is of great significance for the future oil and gas exploration to figure out the hydrocarbon genetic mechanism and accumulation process in this area. Therefore, the tectonic evolution history, burial history, thermal evolution history and hydrocarbon accumulation stages were combined to reproduce the accumulation process of the heavy oil reservoirs. The results show that the heavy oil reservoirs of Paleogene and Neogene have completely different genetic mechanisms and accumulation processes. At the end of the sedimentary period of the Dongying Formation of the Paleogene, the low-mature crude oil from the source rock of the Shahejie-4 Member in the Bonan depression migrated laterally to Sanhecun sag along the unconformity transport layer between the Shahejie-3 Member of Paleogene and the Pre-Paleocene, then accumulated in the stratigraphic overlap traps of Shahejie-3 Member in Paleogene, forming the original heavy oil reservoirs. During the sedimentary period of the upper member of the Guantao Formation and the Minghuazhen Formation, the mature crude oil from the source rocks of the Shahejie-3 Member and Shahejie-4 Member in the Bonan depression migrated to the Kenxi fault horst first, then migrated vertically along Kenxi fault to the Guantao Formation of Neogene, and finally entered the Sanhecun sag through the skeleton sand bodies and faults of Guantao Formation and accumulated in the tectonic-lithologic traps or stratigraphic overlap traps of the Guantao Formation, which turned into secondary heavy oil reservoirs because of strong biodegradation in late stage. Joint exploration of heavy oil reservoir and shallow gas reservoir will be the new domain to increase reserves and production for Jiyang depression.

Key words: heavy oil reservoir, oil-source correlation, genetic mechanism, hydrocarbon accumulation stage, hydrocarbon migration and accumulation, Sanhecun sag

CLC Number:

Gao Changhai, Zhang Xinzheng, Wang Xingmou, Li Yuyuan, Zhang Yunyin, Zhang Jiahao, Wang Jian. Differential hydrocarbon accumulation process of heavy oil reservoirs in Sanhecun sag of Jiyang depression[J]. China Petroleum Exploration, 2018, 23(6): 69-77.

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