Quantitative fluorescence techniques for investigating hydrocarbon charge history in carbonate reservoir

The quantitative grain fluorescence and quantitative grain fluorescence on extract have become effective approaches in the analysis of hydrocarbon evolution in clastic reservoirs recently. The cutoff threshold for differentiating current/paleo-oil and water zones is crucial to reconstruct accurately hydrocarbon accumulation history. However, the absence of theoretical study on the cutoff threshold in the carbonate reservoir has precluded their application and development. In this paper, we attempted to investigate the cutoff threshold by analyzing the quantitative grain fluorescence and quantitative grain fluorescence on extract parameters and spectra of the cores and natural carbonate outcrop samples in known current/paleo-oil and water zones revealed by the frequency of oil inclusions, formation test, logging analysis, etc. Based on this, the hydrocarbon charging history of the Suqiao Buried-hill Zone, Bohai Bay Basin, eastern China was reconstructed using the gotten threshold. Results show that the carbonate minerals fluorescing will lead to a higher cutoff threshold of quantitative grain fluorescence index value in the carbonate reservoir, while the threshold of quantitative grain fluorescence on extract intensity value is coincident with the corresponding value in the clastic reservoir. The quantitative grain fluorescence and quantitative grain fluorescence on extract data have unraveled a complicated hydrocarbon accumulation history in Suqiao Buried-hill Zone including oil charging before gas and paleo-oil loss due to the tectonism. The ascertained cutoff threshold in this study is of great significance for reconstructing accurately and effectively the complicated hydrocarbon charging history in the carbonate reservoir, which provides significant models for future petroleum exploration.

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Hydrocarbon charging and accumulation history in the Niudong Buried Hill Field in the Baxian Depression, eastern China

Marine and Petroleum Geology ◽

10.1016/j.marpetgeo.2017.08.031 ◽

2017 ◽

Vol 88 ◽

pp. 343-358 ◽

Cited By ~ 4

Author(s):

Xianzheng Zhao ◽

Liuping Zhang ◽

Fengming Jin ◽

Quan Wang ◽

Guoping Bai ◽

...

Keyword(s):

Eastern China ◽

Hydrocarbon Charging ◽

Buried Hill ◽

Accumulation History

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Reservoir Characteristics of Buried-hill Draping Zone in L Oilfield, Offshore China

Earth Science Research ◽

10.5539/esr.v10n2p33 ◽

2021 ◽

Vol 10 (2) ◽

pp. 33

Author(s):

Yujuan Liu ◽

Qianping Zhang ◽

Bin Zheng ◽

Jing Zhang ◽

Zhaozhao Qu

Keyword(s):

Seismic Data ◽

Eastern China ◽

Seismic Facies ◽

Bohai Bay ◽

Bohai Bay Basin ◽

Sedimentary Characteristics ◽

Reservoir Characteristics ◽

Production Practices ◽

Buried Hill ◽

Different Parts

The reservoir in different parts of buried-hill draping zone is often quite different, so it is of great significance to clarify the reservoir characteristics for exploration and development. Based on core, well logging, seismic data and production data, reservoir characteristics of oil layer Ⅱ in the lower second member of Dongying Formation of L oilfield, Bohai Bay Basin, offshore eastern China are systematically studied. Analyses of seismic facies, well-seismic combination, paleogeomorphology, and sedimentary characteristics are carried out. Sediment source supply, lake level and buried hill basement geomorphology all contribute to reservoir quality. The research suggests that the different parts of buried-hill draping zone can be divided into four types. Reservoir thickness and physical properties vary. The area where the provenance direction is consistent with the ancient valley direction is a favorable location for the development of high-quality reservoirs. Under the guidance of the results, oilfield production practices in L oilfield offshore China are successful. Knowledge gained from study of L oilfield has application to the development of other similar fields.

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Hydrocarbon accumulation of composite-buried hill reservoirs in the western subsag of Bozhong sag, Bohai Bay Basin

Natural Gas Industry B ◽

10.1016/j.ngib.2019.05.002 ◽

2019 ◽

Vol 6 (6) ◽

pp. 546-555 ◽

Cited By ~ 1

Author(s):

Yuhong Xie ◽

Xiaoping Luo ◽

Deying Wang ◽

Chunqiang Xu ◽

Yunlong Xu ◽

...

Keyword(s):

Bohai Bay ◽

Hydrocarbon Accumulation ◽

Bohai Bay Basin ◽

Buried Hill

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Differential diagenetic evolution and hydrocarbon charging of the tight limestone reservoir of the Da’anzhai Member in the central Sichuan Basin, China

Interpretation ◽

10.1190/int-2018-0192.1 ◽

2020 ◽

Vol 8 (4) ◽

pp. T1007-T1022

Author(s):

Jiao Su ◽

Zepu Tian ◽

Yingchu Shen ◽

Bo Liu ◽

Qilu Xu ◽

...

Keyword(s):

Sichuan Basin ◽

Large Scale ◽

Depositional Environments ◽

Carbonate Reservoir ◽

Source Rocks ◽

Petroleum Exploration ◽

Porosity Reduction ◽

Hydrocarbon Charging ◽

Pore Evolution ◽

Central Sichuan Basin

The tight lacustrine carbonate reservoir of the Da’anzhai Member, Lower Jurassic Ziliujing Formation, in the central Sichuan Basin is a typical tight oil reservoir, and it is one of the crucial petroleum exploration targets in the Sichuan Basin. The porosity of the limestone ranges from 0.5% to 2%, and the permeability ranges from 0.001 to 1 mD. The Da’anzhai limestone experienced multiple diageneses, including compaction, cementation, dissolution, and recrystallization. Different diageneses occurred in the burial process due to the various fabrics and depositional environments, eventually forming distinct rock types; therefore, the pore evolution and hydrocarbon charging characteristics are inconsistent. In our research, there are two stages of major maturation and hydrocarbon expulsion in the source rocks of the Da’anzhai Member. The first large-scale expulsion of hydrocarbon is oil-based and gas-supplemented, whereas the second expulsion is dominated by gas. Hydrocarbon-filling characteristics are different in different types of reservoir rocks. Compared with the bioclastic grainstone and crystalline limestone, we have considered that the argillaceous shell packstone and bioclastic packstone deposited in the shallow and semideep lake environment still contain residual intergranular pores, which have not become fully compacted and are partly filled with hydrocarbons. The presence of hydrocarbon fluid hindered the secondary porosity reduction and was helpful for reserve space preservation.

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Depositional system and hydrocarbon accumulation in Gubei slope zone, Zhanhua Depression, Bohai Bay Basin, eastern China

Energy Exploration & Exploitation ◽

10.1177/0144598716665015 ◽

2016 ◽

Vol 34 (6) ◽

pp. 810-827 ◽

Cited By ~ 3

Author(s):

Ling Guo ◽

Chaochao Jia ◽

Kurt O Konhauser

Keyword(s):

Eastern China ◽

Bohai Bay ◽

Hydrocarbon Accumulation ◽

Bohai Bay Basin ◽

Depositional System

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Hydrocarbon Charging and Accumulation in the Permian Reservoirs of the Wumaying Buried Hill, Huanghua Depression, Bohai Bay Basin, China

Energies ◽

10.3390/en14238109 ◽

2021 ◽

Vol 14 (23) ◽

pp. 8109

Author(s):

Runze Yang ◽

Xianzheng Zhao ◽

Changyi Zhao ◽

Xiugang Pu ◽

Haitao Liu ◽

...

Keyword(s):

Oil And Gas ◽

Fractured Reservoirs ◽

Active Faults ◽

Source Rocks ◽

Coal Measure ◽

Bohai Bay ◽

Accumulation Time ◽

Hydrocarbon Charging ◽

History Of ◽

Buried Hill

The Wumaying buried hill experienced multi-stage tectonic movements, which resulted in a complicated and unclear nature of the hydrocarbon accumulation process. To solve these problems, in this study—based on the structural evolution and burial–thermal history of the strata, using petrology, fluid inclusion microthermometry, geochemical analysis of oil and gas, Laser Raman spectrum, and fluorescence spectrum—the history of hydrocarbon charging was revealed, and the differences in hydrocarbon charging of different wells was clarified. The results indicate that the only source for Permian oil and gas reservoirs are Carboniferous–Permian coal-measure source rocks in the Wumaying buried hill. There are three periods of hydrocarbon charging. Under the channeling of faults and micro cracks, low-mature oil and gas accumulation was formed in the first period, and the accumulation time was 112–93 Ma. In the late Cretaceous, a large-scale uplift exposed and damaged the reservoirs, and part of the petroleum was converted into bitumen. In the middle–late Paleogene, the subsidence of strata caused the coal-measure to expel mature oil and gas, and the accumulation time of mature oil and gas was 34–24 Ma. Since the Neogene, natural gas and high-mature oil have been expelled due to the large subsidence entering the reservoir under the channeling of active faults; the accumulation time was 11–0 Ma. The microfractures of Permian reservoirs in the Wumaying buried hill are the main storage spaces of hydrocarbons, and the fractured reservoirs should be explored in the future. The first period of charging was too small and the second period was large enough in the WS1 well, resulting in only a late period of charging in this well.

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