Organic geochemistry of oils and condensates in the Kekeya Field, Southwest Depression of the Tarim Basin (China)

Li, Maowen; Ren-zi, Lin; Yongsheng, Liao; Snowdon, Lloyd R.; Wang, Peirong; Li, Peilong

doi:10.1016/s0146-6380(98)00201-0

Cited by 60 publications

(24 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These condensates are of low density (0.8183 g/cm 3 ) and low wax content (1.42%). Their high pristane/phytane ratios (3.0e4.1) are similar to those of oils derived from terrestrial source rocks in the Tarim Basin (Li et al, 1999) and Pearl River Mouth Basin (Huang et al, 2003a) in China and the Gippsland Basin in Australia (Philp and Gilbert, 1986). These gasassociated condensates are also characterized by abundant oleanane and bicadinanes, diagnositic biomarkers for terrigenous organic matters widely distributed in the Tertiary strata of Southeastern Asia (Cox et al, 1986;van Aarssen et al, 1990), in the condensates of YC 13-1 gas field and the coastal plain source rocks in the Oligocene Yacheng Formation (Fig.…”

Section: Gas-source Correlationsupporting

confidence: 54%

Geochemistry, origin and accumulation of natural gases in the deepwater area of the Qiongdongnan Basin, South China Sea

Huang

Tian

Li³

et al. 2016

Marine and Petroleum Geology

View full text Add to dashboard Cite

Section: Gas-source Correlationsupporting

confidence: 54%

Geochemistry, origin and accumulation of natural gases in the deepwater area of the Qiongdongnan Basin, South China Sea

Huang

Tian

Li³

et al. 2016

Marine and Petroleum Geology

View full text Add to dashboard Cite

“…Six groups of natural gases can be classified and characterized by a combination of δ 13 C 2 and δ D 1 as follows ( Figure 3): (1) coal-type gas derived from the TriassicJurassic coal measures, which was deposited under continental environment, is characterized by δ 13 C 2 >−28‰ and -150‰ >δ D 1 > −170‰, and the group of gases is distributed in the west part of the Kuqa depression, including gas fields (reservoirs) of Kela2, Dawanqi, Quele1, Yangtake, Yingmai7 and Hongqiqu [38] ; (2) coal-type gas originated from lacustrine mudstones, including the Triassic Huangshanjie Formation and Middle Jurassic Qiekema Formation [38] , is characterized by δ 13 C 2 >−28‰ vs. PDB, and δ D 1 <−170‰ vs. Vsow, and is distributed mainly in the east part of the Kuqa depression, such as Dina, Tiergen and Yaha, etc; (3) oil-type gas is thermally decomposed from the Cambrian-lower Ordovician marine sapropelic sources, characteristic of δ 13 C 2 <−28‰ and −120‰ >δ D 1 > −170‰, and is distributed in the gas (oil) fields of Tazhong, Hetianhe, Lunnan, Jiefangqu, Yingnan2, Lungu, Jilake, etc. [39][40][41] ; (4) oil-type gas, derived from middle-upper Ordovician marine or Carboniferous transitional sapropelic sources [4] , is characterized by δ 13 C 2 <−28‰, δ D 1 < −170‰, and distributed in the Donghetang gas field, Hade gas field and west part of Lunnan gas field; (5) mixing gases are from Carboniferous transitional sapropelic source and Mesozoic humic source, as in the Kekeya gas field [42] ; (6) mixing gases of thermally biogenic gas and little deep gasoccur in the well of Ake1 [43] .…”

Section: Discussionmentioning

confidence: 99%

Hydrogen isotope composition of natural gases from the Tarim Basin and its indication of depositional environments of the source rocks

Liu

Dai

et al. 2008

Sci. China Ser. D-Earth Sci.

View full text Add to dashboard Cite

By measuring carbon and hydrogen isotope compositions for C 1 , C 2 and C 3 of 74 gas samples, natural gases from the Tarim Basin can be divided into six groups on the basis of their origins: (1) coal-type gas derived from coal measures; (2) coal-type gas generated from the T-J lacustrine mudstones; (3) oil-type gas derived from the Cambrian and low Ordovician marine source rocks; (4) oil-type gas from the source rocks deposited in the marine -transitional facies; (5) mixing gas between gas derived from the Carboniferous transitional source rocks and the Mesozoic humic gas, and (6) mixing gases of thermal genetic gas and little deep gas in the Southwest depression of the Tarim Basin. The δ D values of methane in natural gases originating from different type kerogens are affected by both palaeo-environments of the source rock formation (kerogen types) and thermal maturity, with sedimentary environment (kerogen type) as the main controlling factor. Under the similar thermal maturity, the hydrogen isotope composition of methane is more enriched in deuterium in marine environments than lacustrine one. With the increase of thermal maturity and the increase of carbon atomic numbers of gaseous alkanes, the hydrogen isotopes become enriched in deuterium. The δ D values of ethane and propane (δ D 2 , δ D 3 ) are controlled mainly by thermal maturity and to a lesser degree by sedimentary environment of the source rock formation. The partial reversal of hydrogen isotopes for gaseous alkanes would be related to the microbial oxidation, mixing of sapropelic and humic gases and / or mixing of gases from similar kerogen sources with various thermal maturities. In the oil-type gas, the sulfate reduction reaction would result in the reversed order of δ D 1 and δ D 2 (e.g. δ D 1 >δ D 2 ).Tarim Basin, hydrogen isotope, sedimentary environment, thermal maturity Carbon and hydrogen isotopes of gaseous alkanes in natural gases contain rich information about gas source precursor and the geological processes of gas formation, such as the precursor inheritance of stable isotopes and isotope fractionation through geological process of biochemical and physical function. The chemical and carbon isotopic compositions of the gas greatly bear good indications of the precursor types and thermal maturity [1][2][3][4][5][6][7] and have been successfully used to identify coaltype gas and oil-type gas [8][9][10][11] . Although the hydrogen isotopes of gaseous alkanes are not as widely used as carbon isotopes owing to the limitation of accurate measurement, many studies have provided useful information for gas geochemistry research [2,12,13] , such as depositional environment trace. The hydrogen isotope composition of gaseous alkanes is a substantial parameter when it is used in combination with carbon isotope composition. The fresh water has the high abundance of lighter hydrogen isotope, 1 H, whereas the saline water contains the high abundance of heavier hydrogen isotope, deuterium. Generally, the biogenic methane can be di-

show abstract

“…Distributions of the two ratios in the crude oils of the Xifeng oilfield are similar which is significantly different from those in the Permian oils, and the source of the Permian oils is the most likely alterative source for the Xifeng oils, then this would be compelling evidence that the crude oils of the Xifeng oilfield are most likely derived from a similar source ( Fig. 5; Li et al, 1999), and the values for the crude oils of the Xifeng oilfield also show a mixing type of organic matter (Fig. 6).…”

Section: Source and Formation Environment Of Crude Oilsmentioning

confidence: 97%

Geochemical study of crude oils from the Xifeng oilfield of the Ordos basin, China

Duan

Wang

Chen

et al. 2008

Journal of Asian Earth Sciences

154

View full text Add to dashboard Cite

Organic geochemistry of oils and condensates in the Kekeya Field, Southwest Depression of the Tarim Basin (China)

Cited by 60 publications

References 50 publications

Geochemistry, origin and accumulation of natural gases in the deepwater area of the Qiongdongnan Basin, South China Sea

Geochemistry, origin and accumulation of natural gases in the deepwater area of the Qiongdongnan Basin, South China Sea

Hydrogen isotope composition of natural gases from the Tarim Basin and its indication of depositional environments of the source rocks

Geochemical study of crude oils from the Xifeng oilfield of the Ordos basin, China

Contact Info

Product

Resources

About