Abstract
The Huanghua Depression is located in the north-centre of Bohai Bay Basin, which is a rift basin developed in the Mesozoic over the basement of the Huabei Platform, China. Permo-Carboniferous source rocks were formed in the Huanghua Depression, which has experienced multiple complicated tectonic alterations with inhomogeneous uplift, deformation, buried depth and magma effect. As a result, the hydrocarbon generation evolution of Permo-Carboniferous source rocks was characterized by discontinuity and grading. On the basis of a detailed study on tectonic-burial history, the paper worked on the burial history, heating history and hydrocarbon generation history of Permo-Carboniferous source rocks in the Huanghua Depression combined with apatite fission track testing and fluid inclusion analyses using the EASY% Ro numerical simulation. The results revealed that their maturity evolved in stages with multiple hydrocarbon generations. In this paper, we clarified the tectonic episode, the strength of hydrocarbon generation and the time–spatial distribution of hydrocarbon regeneration. Finally, an important conclusion was made that the hydrocarbon regeneration of Permo-Carboniferous source rocks occurred in the Late Cenozoic and the subordinate depressions were brought forward as advantage zones for the depth exploration of Permo-Carboniferous oil and gas in the middle-northern part of the Huanghua Depression, Bohai Bay Basin, China.
Highlights
The Bohai Bay Basin is the largest oil and gas production basin among the petroliferous basins in China (Guo et al, 2016; Ma et al, 2016; Zhao et al, 2014)
Based on the detailed analyses of the burial history, heating history and hydrocarbon generation history of Permo-Carboniferous source rocks (PCSRs) in the Huanghua Depression, the following conclusions have been achieved in this study: 1. Investigation shows that the coal series of the Permo-Carboniferous in the Huanghua Depression underwent a complex tectonic-burial history
The maximum burial depth of PCSR occurred in the Late Himalayan Epoch, which was of significance to the hydrocarbon generation of PCSR
Summary
The Bohai Bay Basin is the largest oil and gas production basin among the petroliferous basins in China (Guo et al, 2016; Ma et al, 2016; Zhao et al, 2014). The study area is the Huanghua Depression, located in the north-centre of the Bohai Bay Basin, which overlies the Palaeozoic cratonic basin of North China; it developed as a fault basin in the Mesozoic and as a rift basin in the Cenozoic. Exploration prospects and potential problems of Permo-Carboniferous oil and gas were raised with the agenda of the continuous development and reduction of the shallow zone in oil and gas traps. The finding of Palaeozoic primary oil in the Kg3 and Kg4 wells at the deep zone of the Huanghua Depression causes geologic condition problems for the Palaeozoic oil in the deep zone of Bohai Bay Basin (Zhu et al, 2001)
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