Overpressure Evolution Recorded in Fluid Inclusions in the Dongpu Depression, Bohai Bay Basin, North China

Liu, Xiuyan; Chen, Honghan; Xiao, Xuewei; Zhang, Hongan; Wang, Yuwei; Xu, Tao; Shang, Pei; Kong, Lingtao

doi:10.1007/s12583-020-1375-x

Cited by 14 publications

(3 citation statements)

References 35 publications

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“…By projecting the Th of coeval aqueous inclusions onto the thermal history–burial history map, and then marking the projection results on the time axis, the hydrocarbon charging periods of different wells and depths can be determined (Bhullar et al, 1999; Karlsen et al, 1993; Liu et al, 2022; Wang et al, 2019; Xiong et al, 2013). The software used in this study is PetroMod (2016) comes from Schlumberger.…”

Section: Discussionmentioning

confidence: 99%

Hydrocarbon charging process of Ordovician strike‐slip fault zones in the Shunbei area, Tarim Basin, NW China

Wu,

Chen,

et al. 2023

Geological Journal

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Ultra‐deep marine carbonate reservoirs is an important field for oil and gas exploration, and it is also a hot research topic in recent years. However, their hydrocarbon episodic charging model is still under debate up to now. A great breakthrough has been made in the newly discovered ultra‐deep fault‐karst oil reservoir in the Shunbei area of Tarim Basin. Based on quantitative gas chromatogram‐mass spectrometry, stable carbon isotopes of reservoir oils, microthermometry and confocal laser scanning analyses of fluid inclusions, the reservoir oil origin and hydrocarbon charging history in Shunbei No. 1, No. 5 and No. 7 strike‐slip fault zones are expounded. The results showed that the Ordovician reservoir oil derives from the source rocks within the Cambrian Yuertusi Formation deposited in a highly anoxic bottom water environment. There were four stages of hydrocarbon charging in the study area, in the late Caledonian, late Hercynian–Indosinian, middle Yanshanian and late Himalayan. During this period, the force‐field strength of the charged oil gradually decreased, and the early‐stage charged crude oil with low maturity and high force‐field strength preferentially accumulated in the Yijianfang Formation, while the late‐stage charged crude oil with high maturity and low force‐field strength preferentially accumulated in the Yingshan Formation. This study reveals the history and differences of petroleum accumulation in the Shunbei fault zones, which is significance for understanding the hydrocarbon distribution in ultra‐deep marine carbonate reservoirs.

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Section: Discussionmentioning

confidence: 99%

Hydrocarbon charging process of Ordovician strike‐slip fault zones in the Shunbei area, Tarim Basin, NW China

Wu,

Chen,

et al. 2023

Geological Journal

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“…1 fault zone reservoir, the Th values of oil inclusions are in the range of 37. The fluorescence color of oil inclusions is widely used to indicate the maturity of the inclusion oil because it is measurable [31][32][33][34]. With increasing maturity, the fluorescence color of oil inclusions changes from yellow to blue [35,36].…”

Section: Microthermometrymentioning

confidence: 99%

The Contribution of Petroleum Charging Episodes to Different Strike-Slip Fault Zones in the Shunbei Area, the Tarim Basin, NW China

Chen

et al. 2023

Energies

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In recent years, newly discovered ultra-deep fault-karst reservoirs in the Shunbei area of the Tarim Basin have greatly increased the prospectivity of the basin and become a hotspot for further hydrocarbon exploration. In this study, the diagenetic sequences of the Lower-Middle Ordovician reservoir were established through observation of thin sections under transmitted light, reflected light, and cathode luminescence. The hydrocarbon charge history in the Shunbei area was reconstructed and associated with a series of diagenetic events using fluid inclusion microthermometric measurements combined with one-dimensional basin modeling. The results show that the Shunbei area has experienced three hydrocarbon charging episodes in total, in the late Caledonian, late Hercynian, and late Himalayan. Finally, the relationship between measured QF-535 factors and the API gravity of crude oil was used to quantify the level of contribution of each of the petroleum charging episodes to the No. 1, No. 5, and No. 7 fault zone reservoirs. The contribution of early hydrocarbon charging episodes gradually increases from west to east in the Shunbei area. This increase was driven by different tectonic events throughout geological history and the subsequent evolution of paleo-structural patterns. This study has a significant impact on marine carbonate reservoir evaluation in strike-slip fault zones in China.

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“…In the past decade, shale oil and gas reservoirs have attracted extensive attention from researchers from academic institutions and oil companies around the world. − Shale gas production in China exceeded 200 × 10 8 m 3 in 2020 and has been successfully exploited at the commercial level in the marine Ordovician Wufeng and Silurian Longmaxi shale reservoirs of the Sichuan Basin and its adjacent areas. , Many studies have noted that natural gas in shale reservoirs mainly occurs in three states: (1) free gas in nano- to micro-scale pore networks and microfractures; (2) adsorbed gas on the surface of OM and clay minerals (CM); and (3) dissolved gas in formation water or liquid hydrocarbons. ,, For postmature Longmaxi shale reservoirs (thermal maturity above 2.0%), free and adsorbed gas are generally regarded as the dominant components of shale gas accumulations, while dissolved gases could be considered negligible since almost no liquid hydrocarbons are present in these reservoirs, that is, the primary sites where dissolved gas occurs. In the two main components above, the proportion of adsorbed gas varies widely, typically accounting for 20–85 and 20–50% of the total shale gas capacity for typical shale gas reservoirs from North America and South China, respectively. ,, Thus, studies related to the adsorption of natural gas, that is, primarily methane, in shale reservoirs are extremely significant for reasonably estimating the economic efficiency of shale gas accumulations.…”

Section: Introductionmentioning

confidence: 99%

Investigations on Supercritical Methane Adsorption and Storage in the Lower Longmaxi Shale of Nanchuan Area, Southeast Sichuan Basin

Zhang

Xiao

et al. 2023

Energy Fuels

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A series of high-pressure methane adsorption measurements were performed at various temperatures on whole shale and kerogen samples collected from the Lower Longmaxi shale in the Nanchuan area, southeast Sichuan Basin, to investigate supercritical methane adsorption properties and evaluate in-place methane storage capacity as a function of burial depth. The results show that the supercritical Dubinin−Radushkevich (SDR) model fits the excess adsorption isotherms marginally better than the supercritical Langmuir model. However, the fitted adsorbed methane density of kerogens obtained from the SDR model may be greater than the liquid methane density at the atmospheric boiling point (0.423 g/cm 3 ). The proposed multiple regression fitting carried out in this work illustrates that approximately 57.59% (34.51−85.45%) and 37.60% (10.74−59.52%) of the methane adsorption capacity at 333.15 K can be attributed to organic matter (OM) and clay minerals (CMs), respectively, for whole shales investigated. According to thermodynamic analyses, the significant contribution of OM to the methane adsorption capacity can be attributed to the stronger affinity between kerogens and methane molecules in contrast to that between CMs and whole shales. The methane storage capacity estimated as a function of burial depth showed that the adsorbed gas storage capacity declines with increasing burial depth between 2000 and 5000 m, while the free gas storage capacity shows the opposite trends. Gas accumulation pressure primarily exerts a significant effect on the free gas storage capacity rather than adsorbed gas storage capacity, and adsorbed gas storage capacity begins to exceed free gas storage capacity at shallow burial depths for normally pressured gas accumulations. Normally pressured shale gas accumulations at shallow burial depths, which are widely distributed in the residual syncline of the study area, should be given more attention due to their relatively low development costs and relatively high storage capacity for adsorbed gas.

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Overpressure Evolution Recorded in Fluid Inclusions in the Dongpu Depression, Bohai Bay Basin, North China

Cited by 14 publications

References 35 publications

Hydrocarbon charging process of Ordovician strike‐slip fault zones in the Shunbei area, Tarim Basin, NW China

Hydrocarbon charging process of Ordovician strike‐slip fault zones in the Shunbei area, Tarim Basin, NW China

The Contribution of Petroleum Charging Episodes to Different Strike-Slip Fault Zones in the Shunbei Area, the Tarim Basin, NW China

Investigations on Supercritical Methane Adsorption and Storage in the Lower Longmaxi Shale of Nanchuan Area, Southeast Sichuan Basin

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