Characterization of Paleogene hydrothermal events and their effects on reservoir properties in the Qikou Sag, eastern China

Yu, Zhichao; Liu, Keyu; Liu, Li; Qu, Xiyu; Yu, Miao; Zhao, Shuang; Ming, Xiaoran

doi:10.1016/j.petrol.2016.08.026

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…In addition to providing a substantial “heat source” for the formation of geothermal resources, deep hydrothermal activities can induce various constructive transformations in thermal reservoirs. These transformations include carbonate dissolution, fluoridation, dolomitization, and the formation of surrounding fractures . CO 2 -enriched acidic hydrothermal fluids migrate vertically into the reservoir through deep and extensive faults, resulting in dissolution processes that create pores, enhance storage properties, and form new aggregation spaces. − Fluoridation refers to the metasomatism of hydrofluoric acid (HF) in deep acidic hydrothermal fluid with carbonate rocks in the formation to produce fluorite.…”

Section: Mechanisms Of Crust-mantle Materials and Energy Exchange Inf...mentioning

confidence: 99%

Mechanisms of Crustal-Mantle Material and Energy Exchanges: Impacts on Hydrocarbon and Geothermal Resources

Luo,

Jiang,

Zhu

et al. 2024

ACS Omega

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The exchange of matter and energy between crust and mantle significantly influences the formation and development of oil, gas, and geothermal resources. Understanding how these exchanges impact these resources is crucial in geological science. In many oil-rich basins in China, significant accumulations of H 2 , CO 2 , geothermal energy, and other associated resources linked to deep mantle materials or geological processes have been discovered. Therefore, investigating the effects of crust-mantle material and energy exchanges on these resources is of utmost importance. This paper aims to systematically analyze the effects of mantle materials (e.g., H 2 , CO 2 , catalytic elements) and energy upwelling into basins. It synthesizes the impacts of various organic−inorganic interactions on hydrocarbon generation, evolution of organic source rocks, reservoir development, and the formation and accumulation of oil and gas. Finally, it proposes a mechanism detailing how interactions between mantle matter and energy influence specific resources. Simultaneously, this study employs numerical simulations to uncover the specific impact of magma intrusions on the geothermal field of surrounding rock formations. It demonstrates that magma chambers, continuously supplied with mantle energy, create regional thermal anomalies and facilitate the development of high-temperature geothermal resources. This underscores that mantle materials and energy not only significantly influence the generation of oil and gas but also govern the formation of geothermal resources and the evolution of thermal reservoirs. This research provides a theoretical foundation for understanding the subsequent formation of oil and gas resources under the influence of deep geological processes. Moreover, it furnishes a scientific basis for evaluating and exploring the symbiotic relationship between oil and gas resources and geothermal reservoirs.

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Section: Mechanisms Of Crust-mantle Materials and Energy Exchange Inf...mentioning

confidence: 99%

Mechanisms of Crustal-Mantle Material and Energy Exchanges: Impacts on Hydrocarbon and Geothermal Resources

Luo,

Jiang,

Zhu

et al. 2024

ACS Omega

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“…The Qikou Sag is the largest hydrocarbon bearing sag of the Bohai Bay Basin in Eastern China, located in the center of the Huanghua Depression with an area of about 5280 km 2 [26]. It is divided into land areas on the west side and sea areas on the east side by the Boxi coastline, which is about 250 km long [26]. The sag is controlled by the faults in North NE (NNE), NE and East West (EW) directions and has the characteristics of extensional fault depression.…”

Section: Study Areamentioning

confidence: 99%

“…The sag is controlled by the faults in North NE (NNE), NE and East West (EW) directions and has the characteristics of extensional fault depression. Its strike-slip activity is very active because its basement from the south to the north is passed by the Lanliao strike-slip fault, as shown in Figure 1 [1,26]. The structural units of Qikou Sag include four negative structural units, namely the Qikou main sag, the Banqiao sub-sag, the Qibei sub-sag and the Qinan sub-sag and four positive structural units named the Beidagang buried hill, the Nandagang buried hill, the along-coastline basement involved fault belt and the Chengbei step-fault belt.…”

Section: Study Areamentioning

confidence: 99%

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Genetic Mechanism and Evolution of the Covert Fault Zone and Its Oil-Controlling Mode in Qikou Sag, Eastern China

et al. 2018

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Covert fault zone is an important type of geological phenomenon that is closely related to hydrocarbon formation and distribution but has often been overlooked because it lacks obvious fault displacement and fault plane. To meet this challenge, a novel cognitive framework is proposed in this study, in which criteria for identifying the existence of covert fault zone are developed based on the regional tectonic backgrounds and geophysical data. The Riedel shear model is then utilized to analyze the genetic mechanism of the covert fault zone. The Mohr-Coulomb theory is also introduced to conduct a structural physical simulation to interpret the evolution process of the covert fault zone. Information about the genetic mechanism and evolution of the covert fault zone is finally combined to determine the oil-controlling mode. The study site is Qikou Sag in Eastern China. It is found that the covert fault zone in Qikou Sag meets four recognition criteria and is generated by the stress transferred from the strike-slip activity of the basement fault. Moreover, it can be concluded that the covert fault zone in Qikou Sag contains five evolution stages and controls the reservoir mainly via three aspects, that is, sedimentary sand, subtle traps and oil accumulation mode.

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2023

The Rock‐Eval Method

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Characterization of Paleogene hydrothermal events and their effects on reservoir properties in the Qikou Sag, eastern China

Cited by 9 publications

References 29 publications

Mechanisms of Crustal-Mantle Material and Energy Exchanges: Impacts on Hydrocarbon and Geothermal Resources

Mechanisms of Crustal-Mantle Material and Energy Exchanges: Impacts on Hydrocarbon and Geothermal Resources

Genetic Mechanism and Evolution of the Covert Fault Zone and Its Oil-Controlling Mode in Qikou Sag, Eastern China

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