Formation conditions of Neogene large-scale high-abundance lithologic reservoir in the Laibei low uplift, Bohai Sea, East China

Xu, Cheng; Yang, Haifeng; Wang, Deying; Zhao, Dijiang; Liliang, Wang

doi:10.1016/s1876-3804(21)60002-2

Cited by 9 publications

(9 citation statements)

References 6 publications

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“…According to 5 fourth-order sequences, the lower part of Minghuazhen Formation is divided into five oil groups from top to next: I, II, III, IV, and V (Figure c). The target layer of this study is the top of the V oil group. ,, …”

Section: Geological Backgroundmentioning

confidence: 99%

“…The target layer of this study is the top of the V oil group. 2,26,27 Predecessors' studies on the Neogene deposits in the Bohai Bay indicate that the river and lake sediments around the Bohai Bay Basin developed well during the Miocene. 1,23,28,29 In addition, the Neogene was the period of contraction during the formation of the Bohai Bay Basin, with the characteristics of stable structure, slow deposition rate, and flat terrain.…”

Section: ■ Geological Backgroundmentioning

confidence: 99%

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Analysis of the Genetic Model of the Extremely Narrow Channel Shallow Water Delta in DL-A Oilfield, Bohai Bay Basin

Fan,

Kong,

et al. 2023

ACS Omega

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Section: Geological Backgroundmentioning

confidence: 99%

Section: ■ Geological Backgroundmentioning

confidence: 99%

Analysis of the Genetic Model of the Extremely Narrow Channel Shallow Water Delta in DL-A Oilfield, Bohai Bay Basin

Fan,

Kong,

et al. 2023

ACS Omega

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“…The exploitation of coalbed gas or methane (CBM) as an unconventional natural gas resource contributes to the adjustment of the global energy structure, presenting itself as a green, clean, and environmentally friendly option . As of 2020, the global CBM resources reached 260 × 10 12 m 3 , with China being the world’s third-largest reserve country for CBM, boasting proven resources up to 36.81 × 10 12 m 3 in the shallow strata (buried depth <2000 m) . Secondary biogenic gas (SBG) is a significant genetic type within CBM.…”

Section: Introductionmentioning

confidence: 99%

Evidence of Coal Biodegradation from Coalbed-Produced Water – A Case Study of Dafosi Gas Field, Ordos Basin, China

Bao,

Hu,

Huang

et al. 2023

ACS Omega

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Bioconversion of coal to methane occurs in the coalbed aquifer environment. To investigate the evidence of coal biodegradation from coalbed-produced water, we collected six field water samples from the Dafosi gas field and prepared one laboratory-simulated water sample and one indoor anaerobic microbial degradation sample with the highest compound concentration as the two reference standards. Gas chromatography−mass spectrometry was used to detect the organic compound type, concentration, and differences in the biomarker compound sensitivity. Results indicate that extracted organic matter from coalbed-produced water samples can be evidence of biodegradation. Variations in range compounds (such as n-alkanes, tri-and pentacyclic terpenes, and steranes) and their sensitivity confirmed active microbial degradation in the studied area. A positive correlation between the n-alkanes content in the coalbed-produced water and the stable carbon isotope value of methane further verifies that the n-alkanes are primary substrates for maintaining microbial activity. Therefore, evidence including n-alkanes, tri-and pentacyclic terpenes, steranes, unresolved complex mixtures, and stable carbon isotope composition of methane contribute to biogenic methane generation in situ. Our limited data suggest that managing soluble organic matter in the coalbed-produced water may provide a viable route for coal biodegradation since most microorganisms survive within the coal seam water.

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“…Therefore, the sedimentary rocks inside it are no longer limited to the above two types. The Junggar basin is a typically big, superimposed basin, including six rst-order tectonic units and 44 secondary tectonic units (Zhao et al, 2014;Ding et al, 2020;Xu et al, 2021;You et al, 2021). In a speci c period, the central sag is not a sedimentary center far from the source area.…”

Section: Introductionmentioning

confidence: 99%

Evolution mechanism of diagenesis of deep sag area in the central Fault basin—A case study of the Wuerhe Formation of the Dongdaohaizi sag in the Junggar basin, Northwest China

Wang

Xie

2023

Preprint

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The Junggar basin is a typical terrestrial fault basin. The stratum in the central area is deeply buried and its sedimentary and rock types are diverse. Its diagenesis is complex and the evolution law of reservoir pores is challenging to characterize, which is not conducive to oil and gas exploration in this region. In this paper, the Dongdaohaizi sag in the central deep basin was taken as an example to be detailed on its sedimentary facies, diagenesis, and micropore structure, revealing the diagenesis sequence and pore evolution law of the deep buried reservoir. First, the sedimentary facies type of the focus stratum (Wuerhe Formation) is assigned to the fan delta, its source is from the northwest, and the rock type is conglomerate, pebbly sandstone, sandstone, and siltstone. The debris content is high among the clastic grains and can reach 40%, showing near-source transport characteristics. Second, the primary diagenesis types and evolution sequence of the Wuerhe Formation is cleared according to experiment data, and the influence degree of the compassion, cementation, and dissolution of the target reservoir rock is clarified. Finally, the sandstone pore evolution model is established, the diagenesis facies is classified, the contribution degree of the unstable clasts and cemented minerals to the secondary pore is determined, and the comprehensive factors with the greatest impact on the late densification of the reservoir are clarified. The diagenesis and pore evolution of the deep rocks in the deep central sag are revealed.

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Formation conditions of Neogene large-scale high-abundance lithologic reservoir in the Laibei low uplift, Bohai Sea, East China

Cited by 9 publications

References 6 publications

Analysis of the Genetic Model of the Extremely Narrow Channel Shallow Water Delta in DL-A Oilfield, Bohai Bay Basin

Analysis of the Genetic Model of the Extremely Narrow Channel Shallow Water Delta in DL-A Oilfield, Bohai Bay Basin

Evidence of Coal Biodegradation from Coalbed-Produced Water – A Case Study of Dafosi Gas Field, Ordos Basin, China

Evolution mechanism of diagenesis of deep sag area in the central Fault basin—A case study of the Wuerhe Formation of the Dongdaohaizi sag in the Junggar basin, Northwest China

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