Petroleum Migration in Lower Devonian Donghe Formation Sandstone (D3d),in Tazhong Area of Tarim Basin
Received date: 2011-08-30
Revised date: 2011-10-02
Online published: 2011-12-10
We choose some geochemical parameters,which are seldom interfered by geological factors,to trace the hydrocarbon migration and filling in the D3dsandstone,Tazhong area of Tarim basin.A certain migration fractionation exists in the 1,3,6tri-methylnaphthalenes /(1,3,6-tri-methylnaphthalenes +1,2,5-tri-methylnaphthalenes) tri-methylnaphthalenes (TMNr),4-methyldibenzothiophene/1-methyldibenzothiophene (4-MDBT/ 1-MDBT),carbazole compounds,G1,G2 and G3 types of C2-alkylcarbazoles.With increase of migration distance,the decrease tendency of TMNr,4-MDBT/1-MDBT,carbazole compounds and G3 type of C2-alkylcarbazoles occurs,in contrast that of the increase of G1 and G2 types of C2-alkylcarbazoles and C3-/C2-alkylcarbazoles is observed.According to the observed results,we consider that the hydrocarbons in the structural high part of eastern Tazhong area were migrated from both northwest to southeast and southeast to northwest,whereas the hydrocarbons in the western Tazhong area were migrated from both northeast to southwest and northwest to southwest.The results also indicate that the hydrocarbons in the D3d sandstone would have undergone long distance migration.
ZHANG Qin, TANG Xuan, YANG Yi-Ting, GE Ming-Na . Petroleum Migration in Lower Devonian Donghe Formation Sandstone (D3d),in Tazhong Area of Tarim Basin[J]. Natural Gas Geoscience, 2011 , 22(6) : 996 -1000 . DOI: 10.11764/j.issn.1672-1926.2011.06.996
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