西南石油大学学报(自然科学版)

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Petroleum Migration Patterns of Donghe Sandstone Secondary
Hydrocarbon Reservoir in North Tarim Basin and Their Implications for
the Future Exploration

Zhou Bo, Jia Jinhua, Chen Xiuyan   

  1. Research Institute of Petroleum Exploration & Development,PetroChina,Haidian,Beijing 100083,China
  • Online:2013-08-01 Published:2013-08-01

Abstract:

The carboniferous Donghe sandstone oilfield consists of two hydrocarbon reservoirs(Donghetang and Hudson)in
the north of Tarim Basin. After analyzing the fluid characteristics,time of reservoir filling,regional structural evolution,hydrocarbon
migration pathways,migration distance and reserve volumes of reservoirs,we conclude that the Donghetang and
Hudson sandstone reservoirs are both secondary hydrocarbon reservoirs. Geochemical data(δ13C values and biomarker compositions)
indicate the oil source is the underlying Ordovician carbonate reservoir. Further study about the tectonic movements
shows the Donghetang and Hudson have different oil accumulation patterns. The Donghetang arch formed in the Hercynian
period and preserved to date,then oil migrated here vertically from the Ordovician reservoirs via the fractures. While the
Hudson reservoir was a northward pinchout trap formed during the late Himalayan movement,then oil migrated here laterally
from the north palaeo-oil pool via the unconformity interface between Carboniferous and Silurian formations. Because of the
limited migration distance,the present secondary reservoirs only distribute close to the palaeo-reservoir. Based on the fact,
we think that the future exploration aiming at the the Donghe sandstone fringe located in the southern part of the north Tarim
Basin should be performed with great caution and more emphasis should be put on the study about hydrocarbon migration and
emplacement on this site.

Key words: Tarim Basin, Carboniferous, Donghe sandstone, secondary hydrocarbon reservoir, oil migration patterns, implications