Genetic types and geochemical characteristics of natural gases in the Jiyang Depression, China

Li, Wentao; Gao, Yang; Chun-yan, Geng

doi:10.1007/s12182-014-0003-8

Cited by 8 publications

(3 citation statements)

References 15 publications

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“…Previous studies have documented that the gas in the deep mantle degassing zone contains hydrocarbons (a kind of TVOC) [42,43]. Moreover, gas of the Huangqiao CO 2 gas field that occurs 100 km to the northeast of the Maodong Fault contains trace amounts of mantle-derived TVOC [44][45][46]. Based on data of field tests, TVOC has been documented in the Boiling-Wells, but it was absent in the nearby shallow groundwater wells.…”

Section: Link Between Co 2 Rn and Tvoc Anomalies In Boiling-wells An...mentioning

confidence: 99%

Long-Lasting Boiling-Wells: Geochemical Windows into the Tectonic Activity of the Maodong Fault (China)

Lin

Jiang

Zhou

et al. 2022

Water

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The Maodong Fault (China) was mainly active during the Late Pleistocene. However, in the past century, numerous destructive earthquakes have occurred along the fault zone, indicating its continuing activity. Therefore, refined monitoring of the tectonic activity along the fault is required. Boiling-Wells located in the Maodong Fault Zone were selected for this purpose. The parameters, including the rare earth elements (REE) and gas components, such as CO2, Rn, and Total Volatile Organic Compounds (TVOC), in the wells were analyzed. By combining field observations with the analytical data, we constrained the relationships between the anomalies of the hydrochemical composition and the gas composition in the Boiling-Wells and the Maodong Fault: (1) CO2 and TVOC in the Boiling-Wells originated from Cenozoic magmatism and associated intrusive rocks. High concentrations of Rn are closely linked to tectonic activities of the Maodong Fault. CO2, TVOC, and Rn are all transported to the Boiling-Wells along the Maodong Fault, with CO2 acting as a carrier gas for Rn. (2) REE in the Boiling-Wells was mainly sourced from CO2 fluids that originated from deep-seated Cenozoic magmas and intrusive rocks. The concentrations of the REE and their distribution patterns were controlled by the input of CO2 fluids and by epigenetic processes. (3) The abnormally high contents of Ca2+, HCO3−, Pb2+, and Al3+ in the Boiling-Wells are attributed to the migration of externally-derived (deep) CO2 fluids through the Maodong Fault. (4) The anomalies of the gaseous (Rn, CO2, and TVOC) and hydrochemical components (Ca2+, HCO3−, Pb2+, Al3+, ∑REE, and REE patterns) in the Boiling-Wells are closely related to the tectonic activity of the Maodong Fault. Therefore, the long-lasting Boiling-Wells provide an excellent geochemical window into the evolution of the Maodong Fault. Our study documents that the contents and variations of specific hydrochemical and gaseous components of Boiling-Wells are well-suited geochemical tracers to identify and characterize the tectonic activity of the Maodong Fault. This method is also applicable for the monitoring of tectonic activities of major faults zones with comparable preconditions worldwide.

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Section: Link Between Co 2 Rn and Tvoc Anomalies In Boiling-wells An...mentioning

confidence: 99%

Long-Lasting Boiling-Wells: Geochemical Windows into the Tectonic Activity of the Maodong Fault (China)

Lin

Jiang

Zhou

et al. 2022

Water

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“…Although the timing of magmatism in the Jiyang Depression remains controversial, it is generally accepted that the majority of magmatism in this area occurred during two events in the Mesozoic and Cenozoic. The Mesozoic magmatism occurred in the Middle Jurassic and Early Cretaceous, whereas the Cenozoic magmatism occurred during the Palaeogene and Neogene (Li et al., 2015). Consequently, the magmatism has influenced the source rocks in the Jiyang Depression by (1) occurring at the same time as initial hydrocarbon generation (i.e.…”

Section: Relationships Between Magmatism and Hydrocarbon Generationmentioning

confidence: 99%

New exploration strategy in igneous petroliferous basins – Enlightenment from simulation experiments

Meng

Jing²,

Li³

et al. 2018

Energy Exploration & Exploitation

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There are two kinds of relationships between magmatism and the generation of hydrocarbons from source rocks in petroliferous basins, namely: (1) simultaneous magmatism and hydrocarbon generation, and (2) magmatism that occurs after hydrocarbon generation. Although the influence of magmatism on hydrocarbon source rocks has been extensively studied, there has not been a systematic comparison between these two relationships and their influences on hydrocarbon generation. Here, we present an overview of the influence of magmatism on hydrocarbon generation based on the results of simulation experiments. These experiments indicate that the two relationships outlined above have different influences on the generation of hydrocarbons. Magmatism that occurred after hydrocarbon generation contributed deeply sourced hydrogen gas that improved liquid hydrocarbon productivity between the mature and overmature stages of maturation, increasing liquid hydrocarbon productivity to as much as 451.59% in the case of simulation temperatures of up to 450 C during modelling where no hydrogen gas was added. This relationship also increased the gaseous hydrocarbon generation ratio at temperatures up to 450 C, owing to the cracking of initially generated liquid hydrocarbons and the cracking of kerogen. Our simulation experiments suggest that gaseous hydrocarbons dominate total

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“…In recent years, there have been significant breakthroughs in exploring for secondary oil and gas pools both at home and abroad, for example, the Middle-Upper Devonian (Frasnian) and Triassic petroleum system in the Midwest of the Ghdames Basin, North Africa (Underdown and Redfern 2008), multibillion barrel accumulation of heavy oil discovered in the Prudhoe Bay-Kuparuk area of the Arctic Alaska, North America (Bird and Houseknecht 2011), the Vuktyl oilfield in the Timan-Pechora Basin, Russia (IHS 2009), and the Upper Cretaceous Sarvak reservoir in the Azadengan oil field, southwest Iran (Du et al 2016). In China, there also have been many discoveries, such as the Carboniferous and Triassic hydrocarbon pools in the Northern Tarim Basin (Zhu et al 2013a, b), the Neogene oil and gas pools in the Bohai Bay and Qaidam Basins (Xu et al 2016;Zhang et al 2003;Li et al 2015;Wang et al 2015), the Jurassic natural gas in the Western Sichuan Foreland Basin (Ye et al 2017), the industrial oil flow discovered in the Damoguaihe Formation in the Hailar Basin (Dong 2011), and the beadlike secondary oil and gas pools in the Heidimiao oil layer in the Songliao Basin (Huang and Guo 2014;Han et al 2011).…”

Section: Introductionmentioning

confidence: 99%

A method for evaluating paleo hydrocarbon pools and predicting secondary reservoirs: a case study of the Sangonghe Formation in the Mosuowan area, Junggar Basin

Wei

Tao

2018

Pet. Sci.

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Taking the Jurassic Sangonghe Formation in the Mosuowan-Mobei area of the Junggar Basin as an example, this paper provides a method that evaluates paleo hydrocarbon pools and predicts secondary reservoirs. Through Quantitative Grain Fluorescence (QGF) experiments, well-tie seismic correlation, and paleo structure analysis, the scale and distribution of paleo hydrocarbon pools in the study area are outlined. Combining current structural features and fault characteristics, the re-migration pathways of paleo oil and gas are depicted. Based on barrier conditions on the oil re-migration pathways and current reservoir distribution, we recognize three types of secondary reservoirs. By analyzing structural evolution and sand body-fault distribution, the major control factors of secondary reservoirs are specified and, consequently, favorable zones for secondary reservoirs are predicted. The results are mainly as follows. (1) In the primary accumulation period in the Cretaceous, paleo hydrocarbon pools were formed in the Sangonghe Formation of the Mosuowan uplift and their size and distribution were extensive and the exploration potential for secondary reservoirs should not be ignored. Besides, paleo reservoirs were also formed in the Mobei uplift, but just small scale. (2) In the adjustment period in the Neogene, traps were reshaped or destroyed and so were the paleo reservoirs, resulting in oil release. The released oil migrated linearly northward along the structural highs of the Mobei uplift and the Qianshao low-relief uplift and then formed secondary reservoirs when it met new traps. In this process, a structural ridge cooperated with sand bodies and faults, applying unobstructed pathways for oil and gas re-migration. (3) The secondary hydrocarbon pools are classified into three types: low-relief anticlinal type, lithologic pinch-out type and fault block type. The distribution of the first type is controlled by a residual low uplift in the north flank of the paleo-anticline. The second type is distributed in the lithologic pinch-out zones on the periphery of the inherited paleo uplift. The third type is controlled by fault zones of which the strikes are perpendicular to the hydrocarbon re-migration pathways. (4) Four favorable zones for secondary reservoirs are predicted: the low-relief structural zone of the north flank of the Mosuowan paleo-anticline, the fault barrier zone on the western flank of the Mobei uplift, the Qianshao low-relief uplift and the north area of the Mobei uplift that parallels the fault zone. The study above effectively supports the exploration of the Qianshao low-relief uplift, with commercial oil discovered in the Qianshao1 well. Besides, the research process in this paper can also be applied to other basins to explore for secondary reservoirs.

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Genetic types and geochemical characteristics of natural gases in the Jiyang Depression, China

Cited by 8 publications

References 15 publications

Long-Lasting Boiling-Wells: Geochemical Windows into the Tectonic Activity of the Maodong Fault (China)

Long-Lasting Boiling-Wells: Geochemical Windows into the Tectonic Activity of the Maodong Fault (China)

New exploration strategy in igneous petroliferous basins – Enlightenment from simulation experiments

A method for evaluating paleo hydrocarbon pools and predicting secondary reservoirs: a case study of the Sangonghe Formation in the Mosuowan area, Junggar Basin

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