黄骅坳陷歧北斜坡油气成藏机制与成藏模式

doi:10.13278/j.cnki.jjuese.20200219

Abstract

Abstract: The hydrocarbon resource of flexure slope break zone as a broad prospect has become a hot spot of exploration, development and research in continental lacustrine basin. Due to the differences of paleogeomorphology or paleostructure, multiple flexural deformations occur in the multi-stage flexural slope strata. Meanwhile, there are great differences in structural and tectonic characteristics, sedimentary characteristics and source rock characteristics. All of these factors in the study area result in complex hydrocarbon distributions and hydrocarbon accumulation processes. Taking the multi-order flexure slope-Qibei slope in Huanghua depression for example, a good understanding of the characteristics of slope structure and tectonic, transport system, hydrocarbon migration path and force under the coupling of paleogeomorphology and faults during the formation and evolution of the slope could be used to reveal the hydrocarbon accumulation mechanism in multi-order flexure slope. The results show that there are great differences between the long and short axis direction of Qibei slope in paleogeography, fault and assemblage style, genetic type and extension range of sand body, contact relationship between sand body and source rock, hydrocarbon migration power and path, etc. Thereby, the long and short axis direction equip with the following characteristics, respectively. The high, medium and low slopes are differentiated by the flexure slope break structure. The large-scale faults are not developed and the range of delta sand bodies is limited. The medium and low slopes are mainly appeared as hydrocarbon transportation of near source sand bodies, in which the sand bodies possess a good connectivity. The hydrocarbon accumulation model of "advantage of bilateral ridge fault on gentle slope-source control type" is formed in the background of slope break. Additionally, the short axis direction is bounded by Binhai fault, Gangdong fault and Nandagang fault. The slope break structure of the fault near the east-west direction is developed, and the secondary fault and their combinations are also developed. The underwater fan sandbody has good connectivity, and forms a ladder transport path with a series of faults. Therefore, the hydrocarbon accumulation model of "near source-step transport-fault control" has been formed.

Key words: flexure slope, Qikou sag, Qibei slope, transport system, hydrocarbon accumulation model

CLC Number:

P618.13

Han Guomeng, Chen Dongxia, Ma Jianying, Wang Ziyi, Dong Xiaowei, Gao Sihang, Zou Leiluo, Wang Na. Hydrocarbon Accumulation Mechanism and Accumulation Model of Qibei Slope in Huanghua Depression[J].Journal of Jilin University(Earth Science Edition), 2021, 51(6): 1636-1653.

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Hydrocarbon Accumulation Mechanism and Accumulation Model of Qibei Slope in Huanghua Depression

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