Hydrocarbon charging of the Ordovician reservoirs in Tahe-Lunnan area, China

The TaheLunnan hydrocarbon province is China＇s largest region with oilandgasproducing marine carbonate rocks. However, in terms of multisource hydrocarbon generation, multiepisode reservoir adjustment and reconstruction, it remains unsettled how to determine the geological period of primary hydrocar...

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Published inScience China. Earth sciences Vol. 56; no. 5; pp. 763 - 772
Main Authors Wu, Nan, Cai, ZhongXian, Yang, HaiJun, Wang, ZhenQi, Liu, XianFeng, Han, JianFa
Format Journal Article
LanguageEnglish
Published Heidelberg SP Science China Press 01.05.2013
Springer Nature B.V
Subjects
Cambrian
Carbonate rocks
Carboniferous
China
Crude oil
Earth and Environmental Science
Earth Sciences
Fractionation
High temperature
Homogenizing
Hydrocarbons
Inclusions
Natural gas
Ordovician
Petroleum hydrocarbons
Petrology
Research Paper
Reservoirs
Rocks
中国
地质时期
奥陶系油藏
油气生成
海相碳酸盐岩
烃源岩
碳氢化合物
轮南地区
hydrocarbon charging
gas washing
Ordovician
Lunnan uplift
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Summary:The TaheLunnan hydrocarbon province is China＇s largest region with oilandgasproducing marine carbonate rocks. However, in terms of multisource hydrocarbon generation, multiepisode reservoir adjustment and reconstruction, it remains unsettled how to determine the geological period of primary hydrocarbon filling of the Ordovician reservoir in this region. Based on the analysis of distribution and properties of reservoir, hydrocarbon filling of the Cambrian source rocks in the Late Caledon stage has largely been destroyed. However, hydrocarbon filling of the Middle Ordovician source rocks in the Early Carboniferous resulted in the major body of crude oil. During the charging process, the hydrocarbons were oxidatively degraded to heavy oil due to the poor closure conditions, which is corroborated by homogenization temperature of inclusions. Moreover, the captur ing of hydrocarbon inclusions with hightemperature does not represent the filling of mature petroleum in the later period, but represents the result of the natural gas containing light fraction. Therefore, the TaheLunnan area underwent two hydrocarbon filling processes, and the invasion of excessive dry gas led to a gaswashing fractionation upon the original Ordovician reser voirs.
Bibliography:The TaheLunnan hydrocarbon province is China＇s largest region with oilandgasproducing marine carbonate rocks. However, in terms of multisource hydrocarbon generation, multiepisode reservoir adjustment and reconstruction, it remains unsettled how to determine the geological period of primary hydrocarbon filling of the Ordovician reservoir in this region. Based on the analysis of distribution and properties of reservoir, hydrocarbon filling of the Cambrian source rocks in the Late Caledon stage has largely been destroyed. However, hydrocarbon filling of the Middle Ordovician source rocks in the Early Carboniferous resulted in the major body of crude oil. During the charging process, the hydrocarbons were oxidatively degraded to heavy oil due to the poor closure conditions, which is corroborated by homogenization temperature of inclusions. Moreover, the captur ing of hydrocarbon inclusions with hightemperature does not represent the filling of mature petroleum in the later period, but represents the result of the natural gas containing light fraction. Therefore, the TaheLunnan area underwent two hydrocarbon filling processes, and the invasion of excessive dry gas led to a gaswashing fractionation upon the original Ordovician reser voirs.
11-5843/P
Lunnan uplift, hydrocarbon charging, Ordovician, gas washing
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-7313
1869-1897
DOI:10.1007/s11430-013-4598-1