Hydrocarbon accumulation in deep fluid modified carbonate rock in the Tarim Basin

Lü, Xiuxiang; Xie, Qi; Yang, Ning; Li, Jianjiao

doi:10.1007/s11434-007-6017-5

Cited by 12 publications

(9 citation statements)

References 31 publications

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“…Karst was well developed in Ordovician, so it can be preferable for reservoirs. Lunnan-Tahe oilfield is considered as the biggest one with Paleozoic marine carbonate reservoirs in China (Lü et al, 2007;Liang, 2008;Jin et al, 2009). Thick sediments in Mesozoic and Cenozoic became a good regional cap rocks, so that oil and gas had been well preserved.…”

Section: Introductionmentioning

confidence: 99%

Distribution and Implication of Adamantane in Crude Oils in Lunnan Area, Tarim Basin in China

Zhu

Jiang

Jin

et al. 2012

Energy Exploration & Exploitation

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According to the present research, the cage structure makes adamantane very stable to resist cracking even at a higher temperature, so its concentration will be increased with temperature rising. But adamantane quantitative analysis of oil in Lunnan area shows a poor correlation between its concentration and geotemperature. Instead, it has a good relationship with maturation parameters such as the content of C 29 ααα 20R sterane and C 28 triaromatic steroid 20R as well as Ts/Tm. The reason is that the oil and cracked products generated in deep zone upwards charged in oil layers in low maturity and then turned into mixed oil which had higher concentration of Ts, adamantine etc. So it makes the parameters such as Ts/Tm ratio and adamantine concentration elevate. The incorporation a great amount of low molecular hydrocarbons diluted C 29 ααα 20R sterane and C 28 triaromatic steroid 20R, which resulted in the parameters of the mixed oil to indicate a higher maturation. Oils with higher adamantane concentration are mainly distributed on Lunnan fault-host zone, Sangtamu faulthost zone and Jilake structure zone. Cracked oil generated in deeper bed migrated along fractures which acted as channels upwards into the reservoir, and so adamantane content of the mixed oil increased. The source of Paleozoic oils in Tarim basin is involved only in two beds: lower Ordovician-Cambrian and middle-upper Ordovician. But according to the data in this paper, there is no obviously difference in adamantane concentration of oils from the two layers.

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Section: Introductionmentioning

confidence: 99%

Distribution and Implication of Adamantane in Crude Oils in Lunnan Area, Tarim Basin in China

Zhu

Jiang

Jin

et al. 2012

Energy Exploration & Exploitation

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“…Ordovician hydrocarbon reservoirs in the Tarim Basin are significantly influenced by magmatism and associated hydrothermal activity [18][19][20]. Hydrothermal activity resulted in the precipitation of minerals such as calcite, and it created a high-temperature environment that was favorable for the occurrence of TSR in the reservoirs [13][14][15][16][17][18][19]. TSR is an important process for the formation of pyrite in the Ordovician reservoirs, and pyrites of TSR genesis are characterized by enriched sulfur isotope compositions [13,15,18,19].…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Pyrite is widely distributed in Ordovician hydrocarbon-bearing carbonate rocks within the Tarim Basin, North West (NW) China, and the precipitation of pyrite is closely associated with hydrocarbons [13][14][15][16][17][18][19]. Previous petrographic and isotopic studies have shown that there are two groups of pyrite; these are (i) by-products of thermochemical sulfate reduction (TSR) and (ii) bacterial sulfate reduction (BSR), respectively [13][14][15][16][17][18][19]. Sulfate minerals can be reduced to hydrogen sulfide (H 2 S) by hydrocarbons either through bacterial metabolism (i.e., BSR) or thermochemical pathway (i.e., TSR) [7].…”

Section: Introductionmentioning

confidence: 99%

“…H 2 S can be further transformed into pyrite provided there is a sufficient iron budget [7]. BSR-derived pyrites mainly occur in karst breccias and are characterized by depleted δ 34 S values ranging from −25.7% to −4.7% in the Tarim Basin [14,[16][17][18][19]. Those pyrites are precipitated in a low-temperature environment (60-80 • C) when hydrocarbon reservoirs are uplifted to the surface/subsurface [18,19].…”

Section: Introductionmentioning

confidence: 99%

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First Direct Dating of Alteration of Paleo-Oil Pools Using Rubidium-Strontium Pyrite Geochronology

Wang

et al. 2020

Minerals

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Direct dating of petroleum systems by hydrocarbon or associated authigenic minerals is crucial for petroleum system analysis and hydrocarbon exploration. The precipitation of authigenic pyrite in petroliferous basins is commonly genetically associated with hydrocarbon generation, migration, accumulation, or destruction. Pyrite rubidium-strontium (Rb-Sr) isotope dilution thermal ionization mass spectrometry (ID-TIMS) is a well-developed technique, and its successful application for high-temperature ore systems suggests that this dating method has the potential to directly date key processes in the low-temperature petroleum systems. Rb-Sr data for pyrites in two Ordovician carbonate rock specimens collected from ~4952 m in the YD-2 well in the Yudong region, northern Tarim Basin (NW China), yield two identical isochron ages within analytical uncertainties: 206 ± 13 (2σ) and 224 ± 28 Ma (2σ). SEM investigations demonstrate that Rb and Sr atoms mainly reside in the crystal lattice of the pyrites due to the absence of fluid and mineral inclusions. The rigorous Rb-Sr isochron relations documented in the samples indicate that such residency can result in sufficient Rb/Sr fractionation and initial Sr isotopic homogenization for geochronology. In addition, the closure temperature (227–320 °C) for the Rb-Sr isotope system in pyrite is higher than the precipitation temperature for pyrite in petroleum-related environments (below 200 °C), suggesting that the Rb-Sr age of pyrite was not overprinted by post-precipitation alteration. Integrating the lead-strontium-sulfur isotopes of the pyrites with burial history analysis, the ages are interpreted as the timing of alteration of the paleo-oil pool by a hydrothermally-triggered thermochemical sulfate reduction process. This study, for the first time, demonstrates that Rb-Sr pyrite geochronology, combined with radiogenic and stable isotopic analyses, can be a useful tool to evaluate the temporal evolution of oil pools. This approach bears great potential for dating of petroleum systems anywhere else in the world.

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“…Today, carbonate reservoirs in the Tarim Basin are found mainly along fault zones, unconformities, biohermal suites, fracture zones and near effective source rocks (Lü and Jin, ). Carbonate plays have been widely studied in China (Yang et al ., , ; Chi et al ., ; Lü et al ., , , , ; Zhao et al ., ; Chen et al ., ; Han et al ., ; Zou and Tao, ; Luo et al ., ; Zhao, ; Gu et al ., ; Zhang and Liu, ). At a great burial depth and high degree of diagenesis, primary pores in carbonate reservoir beds have nearly disappeared, and reservoir beds depend on secondary pores or fractures (Pang, ).…”

Section: Introductionmentioning

confidence: 99%

Early Palaeozoic carbonate reservoirs from the Yingshan Formation of Well block ZG-43 in Tazhong Low Rise, Central Uplift, Tarim Basin, NW China: geological features and controlling factors

Lan

Lü

et al. 2013

Geol. J.

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Marine carbonate reservoirs, as a focus of petroleum exploration and development in China, are involved with high exploration risk and prediction difficulty owing to high heterogeneity and diversity of reservoir beds. In the Tarim Basin, NW China, carbonate reservoirs host about 38% of the whole basin's hydrocarbon resources in a large prospecting area mainly distributed in the Cambrian and Ordovician rocks in central (Tazhong) and northern (Tabei) Tarim. Recently, a better understanding has been made of the karsted weathering crust at the top of the Lower Ordovician Yingshan Formation in the northern slope area of the Tazhong Low Rise, Central Uplift, Tarim Basin. As a new frontier of exploration, oil/gas distribution and controlling factors of carbonate reservoirs in the Yingshan Formation are not clearly understood. In this work, we investigated the reservoir beds and oil/gas properties in 13 wells in Well block ZG‐43 on the No. 10 structural belt in the Tazhong Low Rise, and studied hydrocarbon accumulation characteristics with seismic and geochemical data. The Yingshan Formation in Well block ZG‐43 is mainly composed of calcarenite, dolomitic limestone, dolomite, cryptite, as low porosity and low permeability reservoir beds, with fracture‐void porosity constituting the main reservoir pore space. Oil/gas is quasi‐layer distributed beneath the unconformity between the Yingshan and Lianglitag formations to a depth of 140 m. The oil in Well block ZG‐43 is condensate with low density, low viscosity, low sulphur, low resin, low asphaltene, and high wax. The gas is 87.3% methane, generally containing H2S. The oil/gas distribution pattern is oil in the east and gas in the west, and H2S content in the west is lower than that in the east. The controlling factors for hydrocarbon are multi‐source supply and multi‐phase charging, interstratal karstification, hydrothermal activity, structural location and sealing condition. A structural–lithological trap is the main type of oil/gas accumulation. Oil/gas distribution was clearly affected by strike–slip faults. Oil/gas with multi‐source supply and multi‐phase charging was controlled by favourable local palaeo‐highs, and affected by later karsting and hydrothermal activity, as well as gas invasion in the Himalayan (Cenozoic) period. Under the caprock of compact limestone in the third to fifth members of the Lianglitag Formation, oil/gas migrated up along the strike–slip fault planes, and moved laterally to both sides in a ‘T’ shape, and formed large‐scale quasi‐layer condensate gas reservoirs controlled by reservoir bed quality. Copyright © 2013 John Wiley & Sons, Ltd.

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Hydrocarbon accumulation in deep fluid modified carbonate rock in the Tarim Basin

Cited by 12 publications

References 31 publications

Distribution and Implication of Adamantane in Crude Oils in Lunnan Area, Tarim Basin in China

Distribution and Implication of Adamantane in Crude Oils in Lunnan Area, Tarim Basin in China

First Direct Dating of Alteration of Paleo-Oil Pools Using Rubidium-Strontium Pyrite Geochronology

Early Palaeozoic carbonate reservoirs from the Yingshan Formation of Well block ZG-43 in Tazhong Low Rise, Central Uplift, Tarim Basin, NW China: geological features and controlling factors

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