Variations of diamondoids distributions in petroleum fluids during migration induced phase fractionation: A case study from the Tazhong area, NW China

被引:27
作者
Zhang, Zhiyao [1 ]
Zhang, Yijie [1 ]
Zhu, Guangyou [1 ]
Han, Jianfa [2 ]
Chi, Linxian [1 ]
机构
[1] PetroChina, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
[2] PetroChina, Res Inst Petr Explorat & Dev, Tarim Oilfield Branch Co, Korla 841000, Peoples R China
关键词
Diamondoids; Secondary condensates; Phase fractionation; Ordovician; Tarim basin; TARIM BASIN; OIL CRACKING; HYDROCARBON ACCUMULATION; GAS CONDENSATE; COMPOSITIONAL CHANGES; GASEOUS HYDROCARBONS; PVT PROPERTIES; NATURAL GASES; DEEP OIL; EXPLORATION;
D O I
10.1016/j.petrol.2019.05.016
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Diamondoids, resistant to thermal and biological destruction, are useful in identifying the genesis and alteration history of petroleum fluids, especially for condensates in which conventional biomarkers are of trace amounts. Tremendous condensate resources have been discovered in the Ordovician carbonates from the central Tarim Basin, however, the complex genesis and distribution of the condensates have brought challenges in effective exploration and fluid prediction. In this study, the GC x GC-TOFMS analyses were applied on several condensate oil samples. Results showed great variance in the distribution and absolute concentration of diamondoids. Accompany the integrated geochemical and geologic analyses, the studied condensates are 'daughter' condensates generated from the similar 'parent' condensates that have undergone severe phase fractionation induced by migration. Phase fractionation led to the constant loss of vapor fractions and enriched heavy fractions in the residual condensates during the migration of petroleum fluids towards structural highs. Accordingly, diamondoids were preferentially enriched in shallower condensates and depleted in residual condensates, such variations of diamondoids distributions are attributed to phase fractionation because diamondoids with different molecular sizes differ in the solubilities in vapor phase. This will bring insight into the genesis of secondary condensates and the evaluation of the fractionation extent of petroleum fluids, with which effective petroleum exploration and prediction can be obtained.
引用
收藏
页码:1012 / 1022
页数:11
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