西南石油大学学报(自然科学版)

• 地质勘探 • 上一篇    下一篇

塔北东河砂岩次生油藏油气运聚模式及启示

周波,贾进华,陈秀艳   

  1. 中国石油勘探开发研究院,北京海淀100083
  • 出版日期:2013-08-01 发布日期:2013-08-01

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

摘要:

塔北石炭系东河砂岩油藏主要由东河塘和哈得逊两个油藏构成。通过解析两个油藏的流体特征、充注时间、
油区构造演化、油气运移通道及距离和储量规模,指出两个油藏的主要充注时间晚于烃源岩生烃时间,均为次生油藏,
油源为奥陶系古油藏,新油藏靠近古油藏运移并聚集。推断东河塘和哈得逊具有不同的油气运移模式:东河塘构造型
油藏原油来源于下伏的奥陶系油藏,借助纵向断裂运移至此;哈得逊为北倾的地层型圈闭,原油主要来源于北部的古
油藏,运移通道为石炭系和志留系之间的不整合面。结合近5 年来新钻井揭示的地质现象,认为塔北南部东河砂岩相
变尖灭带油气成藏比较困难,后续勘探应当谨慎且尤需重视次生油藏成藏规律研究。

关键词: 塔里木盆地, 石炭系, 东河砂岩, 次生油藏, 油气运移模式, 启示

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