Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (5): 44-51.doi: 10.12108/yxyqc.20190505

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Hydrocarbon accumulation characteristics of Cretaceous volcanic rocks in Wangguantun tectonic zone, Huanghua Depression

ZHENG Qinghua, YOU Jiyuan   

  1. School of Chemistry & Chemical Engineering, Yulin University, Yulin 719000, Shaanxi, China
  • Received:2019-05-05 Revised:2019-06-20 Online:2019-09-21 Published:2019-09-16

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Abstract: Many high-yield wells have been found in Cretaceous volcanic rocks in Wangguantun tectonic zone, and oil and gas are enriched. In order to explore the main controlling factors of hydrocarbon accumulation,combined with inclusions and burial history,the petroleum geologic characteristics of Cretaceous volcanic rocks were analyzed,and hydrocarbon accumulation stages and model were defined. The results show that the Cretaceous oil and gas in Wangguantun tectonic zone originated from dark mudstone and shale of the second member of Kongdian Formation. The volcanic reservoir was dominated by lava,pyroclastic rocks and pyroclastic sedimentary rocks. The lithofacies can be divided into four lithofacies and seven subfacies. Primary reservoir space mainly included pore,intercrystal pore,intergranular pore and shrinkage fracture,and secondary reservoir space mainly consists of high-porosity structural fracture and dissolution pore. There are two sets of reservoir-cap assemblages in the Cretaceous volcanic rocks,which have two types of traps:horst structure trap and fault nose structure trap. Its hydrocarbon filling period began in the Late Oligocene and lasted till now. It was a typical lateral hydrocarbon supply and accumulation model of Cenozoic-Mesozoic reservoir. The main controlling factors of hydrocarbon accumulation are that:hydrocarbon supply window controls lateral hydrocarbon supply of source rocks;structural fracture and dissolution improve reservoir performance;structural style and evolution control hydrocarbon preservation and accumulation.

Key words: volcanic rock, hydrocarbon accumulation, oil-source correlation, Wangguantun tectonic zone, Huanghua Depression

CLC Number: 

  • TE122.31
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