Study on secondary migration of hydrocarbons in Tazhong area of Tarim Basin in terms of carbazole compounds

Liu, Luofu; Kang, Yongshang

doi:10.1007/bf02873930

Cited by 11 publications

(5 citation statements)

References 3 publications

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“…Some samples such as those collected at the 4611.24 m interval of Well TZ31 and at the 3736.28 m interval of Well TZ 32 have this parameter up to 1.000. In previous studies on the Carboniferous oil samples from southwestern Tarim Basin (Liu Liu Luofu, 1997) and Tazhong (Liu Luofu, 1998;Liu Luofu and Kang Yongshang, 1999), similar observations were made. For instance, the alkyl carbazole/(alkyl carbazole+benzocarbazole) ratio of the Lower Carboniferous oils from Well Q4 and Well Q5 in southwestern Tarim Basin is 1.00, and in the Tazhong area, the ratio of the Ordovician oils is 0.799, that of the Silurian oils is 0.723, and that of the Carboniferous oils is 0.801-1.000.…”

Section: Ratios Of Trimethyl Carbazole (A)/(c) Benzocarbazole [A]/[csupporting

confidence: 83%

“…Neutral nitrogen compounds of the carbazole type have been proved to be a useful geochemical index for the study of hydrocarbon migration through several years of oil exploration activity because of their stability of and difference in polarity (Dorban et al, 1984;Brothers et al, 1991;Yamamoto, 1992;Li Maowen et al, 1995, 1997aLarter et al, 1996;Liu Luofu and Xu Xinde, 1996;Liu Luofu and Mao Dongfeng, 1996;Liu Luofu, 1997, 1998Liu Luofu et al, 1997;Liu Luofu and Kang Yongshang, 1999;Li Sumei et al, 2000a, 2001. Recent studies both at home and abroad have indicated that the distributions of nitrogen compounds are also affected by several factors in addition to migration.…”

Section: Introductionmentioning

confidence: 98%

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The distribution and geological significance of carbazole compounds in Silurian paleo-pools of the Tarim Basin, Northwest China

et al. 2008

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The results presented in this paper indicated that the carbazole-type compounds have high thermal stability and also show stability in oxidation and bio-degradation. This kind of compounds still has high concentrations and a complete distribution in the analyzed dry asphalt samples, showing that they are particularly useful in the study of hydrocarbon migration of the paleo-pools. The difference in the contents of nitrogen compounds in the Silurian dry asphalts from the Awati, Tabei and Tazhong areas is attributed to the difference in the extent of oxidation and (or) bio-degradation for the areas; the Awati and Tabei areas underwent relatively strong oxidation and bio-degradation. During the first stage of hydrocarbon pool formation in the Silurian system in the Tazhong and Tabei areas of the Tarim Basin (at the end of the Silurian period) and at the second stage in the Awati area (in Permian), the hydrocarbons experienced a long-distance migration.

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Section: Ratios Of Trimethyl Carbazole (A)/(c) Benzocarbazole [A]/[csupporting

confidence: 83%

Section: Introductionmentioning

confidence: 98%

The distribution and geological significance of carbazole compounds in Silurian paleo-pools of the Tarim Basin, Northwest China

et al. 2008

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“…3 Experimental @Extraction of dry asphalts from the asphaltic sandstones: The ground asphaltic sandstone samples were extracted with chloroform for 48 hours (Soxhlet extraction), and extractable organic matter (EOM) was obtained after drying the organic matter at room temperature. @Separation of pyrrolic nitrogen compounds from the EOM: The flow chart and conditions of separation are the same as former researches (Liu, 1998;Liu and Kang, 1998). The neutral alumina (100-200 mesh) and silicic acid were activated at 110°C before use.…”

Section: Samplingmentioning

confidence: 99%

“…The neutral nitrogen compounds of carbazole-type have proved to be a useful geochemical indicator for petroleum migration studies for several years due to their stability and difference of polarity (Dorbon et al, 1984;Brothers et al, 1991;Yamamoto, 1992;Larter et al, 1996;Liu and Mao, 1996;Liu and Xu, 1996;Liu, 1997;Liu et al, 1997;Liu, 1998;Liu and Kang, 1998;Li et aL, 2000a;Li et al, 2001). Recent researches at home and abroad indicated that nitrogen compound distributions are influenced by several factors besides migration.…”

Section: Introductionmentioning

confidence: 99%

Petroleum Migration Direction of the Silurian Paleo‐pools in the Tarim Basin, Northwest China

Liu

Zhao²,

Hong³

et al. 2008

Acta Geologica Sinica (Eng)

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The results obtained in this paper indicate that carbazole-type compounds have high thermal stability and also show stability in oxidation and bio-degradation. This kind of compounds still has a high concentration and complete distribution in the analyzed dry asphalt samples, showing that they are particularly useful in studying petroleum migration of paleo-pool. During the basin's first-stage of oil-gas pool formation in the Silurian in Tazhong and Tabei areas of Tarim Basin (at the end of Silurian period) and the second-stage in the Awati area (in Permian), the petroleum experienced a long-distance migration. During the formation of the Silurian paleo-pools in Tazhong Uplift at the end of Silurian, the petroleum mainly came from the lower and middle Cambrian source rocks in the Manjiaer sag. The petroleum migrated towards the southwest-south entering the Silurian reservoir beds in Tazhong first. Then, it further migrated within Silurian from northwest to southeast along the highs of the Structural Belts to the region of the Silurian pinchout boundary in Tazhong. In Tabei Uplift, during the first-stage of pool formation, the petroleum was also from the lower and middle Cambrian source rocks in the Manjiaer sag. It migrated northwest entering the Silurian reservoir beds in the Tabei Uplift firstly, and then the migration continued in the same direction within the Silurian reservoirs and finally the petroleum was trapped in higher positions. During the second-stage pool formation in the Silurian beds in the areas around Awati sag, the petroleum mainly came from the lower-middle Cambrian source rocks in the Awati sag. The petroleum migrated from the generation center to Silurian reservoirs in all directions around the sag through major paths, and the petroleum was finally trapped in higher locations.

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“…Because the hydrogen atom on pyrrolic nitrogen can form a hydrogen band with the oxygen atom on the surface of oxygenous rocks in reservoirs easily, carbazoles have been suggested to play an important role in the absorption of petroleum on reservoir rocks and affect processes involved in petroleum migration and production (Li et al, 1995(Li et al, , 1997. Until now, petroleum geochemistry study on organic nitrogen compounds has been focused on their use as markers of oil secondary migration (Later et al, 1996;Liu Luofu et al, 1997;Liu Luofu and Kang Yongshang, 1999;Wang Tieguan et al, 2000). Generally it is well known that the benzocarbazoles being "exposed" are most absorbed by surrounding minerals, but those being "shielded" are least.…”

Section: Introductionmentioning

confidence: 98%

Molecular structure parameters and thermal stabilities of benzocarbazoles

Chen

Liu

et al. 2008

Chin. J. Geochem.

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The distance between 4-H and adjacent H on the substitutional benzene ring in benzo[c]carbazole was calculated in terms of molecular structure parameters. The result showed that the distance is shorter than the sum of van der Vaals' radii of two hydrogen atoms. This means that there is a steric hinderance between them. This effect will make the bond angle stretch and the bond length extend, or cause the molecule to distort, thus making benzo[c]carbazoles become unstable in thermodynamics. On the contrary there is no such effect for benzo [a]carbazoles. This conclusion has been confirmed by the result of calculation of the distance between the same two atoms with software GaussView. So the skeleton of benzo[c]carbazoles in sediments may be breached or isomerized with increasing maturity. It is consistent with the decrease of the ratio of benzo[c]carbazole to benzo[a]carbazole in hydrocarbon migration, suggesting that [c]/[a] not only changes with the distance of migration, but also may be influenced by maturity.

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Study on secondary migration of hydrocarbons in Tazhong area of Tarim Basin in terms of carbazole compounds

Cited by 11 publications

References 3 publications

The distribution and geological significance of carbazole compounds in Silurian paleo-pools of the Tarim Basin, Northwest China

The distribution and geological significance of carbazole compounds in Silurian paleo-pools of the Tarim Basin, Northwest China

Petroleum Migration Direction of the Silurian Paleo‐pools in the Tarim Basin, Northwest China

Molecular structure parameters and thermal stabilities of benzocarbazoles

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