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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/09202423007
Using δD of methyl aromatics and oils to trace the reservoir charging characteristics of complex petroleum systems in Tarim Basin, northwestern China
Bin Cheng,1 Yiman Zhang,2 Zhiwei Wei,3 Hanyu Deng,4 Haozhe Wang,5 Yun Li,6 Liangliang Wu,7 Wenmin Jiang,8 Haizu Zhang,9 and Zewen Liao10
1State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guangzhou, China; [email protected]
2State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou, China; University of CAS, Beijing, China; [email protected]
3State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou, China; China Nonferrous Metals (Guilin) Geology and Mining Company, Guilin, China; [email protected]
4State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou, China; University of CAS, Beijing, China; [email protected]
5State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou, China; University of CAS, Beijing, China; [email protected]
6State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou, China; CAS Center for Excellence in Deep Earth Science, Guangzhou, China; [email protected]
7State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou, China; CAS Center for Excellence in Deep Earth Science, Guangzhou, China; [email protected]
8State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou, China; CAS Center for Excellence in Deep Earth Science, Guangzhou, China; [email protected]
9Research Institute of Petroleum Exploration and Development, PetroChina Tarim Oilfield Company, Korla, China; [email protected]
10State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou, China; CAS Center for Excellence in Deep Earth Science, Guangzhou, China; [email protected]
ABSTRACT
Aromatization occurs steadily during the petroleum evolution stage of light oil/condensate (LOC) formation, for which the composition and δD of aromatics are of considerable geochemical significance. This paper presents a study on the composition and δD of monomethyl aromatic compounds (toluene, methylnaphthalene, methylphenanthrene, and methyldibenzothiophene) and related hydrocarbon compounds in LOCs from the Tazhong uplift area of the Tarim Basin in China. Thermal maturity, the source rock of the LOCs, and the effect of gas washing on the oils are discussed. The calculated reflectance of the oils using methyldibenzothiophene and dimethylnaphthalene parameters is approximately 1.15%–1.5%. The thermal maturity of the oils in the Tazhong I fault-slope zone is slightly higher than that of the oils in the Tazhong 10 structural belt due to the more intense gas washing of the oils in the former. The varying degrees of gas washing also caused enrichment of low-carbon-number aromatic hydrocarbons and their 2H isotopes in the oils of the Tazhong I fault-slope zone relative to those of the Tazhong 10 structural belt. In addition to the contributions from lower Cambrian and Middle–Upper Ordovician source rocks, these crude oils may have received contributions from upper Cambrian Furongian source rocks deposited within locally shielded environments. Crude oils such as TZ62(Silurian) and ZG432(Ordovician) contain heavy δ13C but light δD isotopic compositions and may represent end member oils derived from Furongian source rocks.
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