Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (6): 30-36.doi: 10.3969/j.issn.1673-8926.2011.06.006

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Sandstone component of outcrops of Yanchang Formation in the margin of Ordos Basin and its geological significance

HE Jing 1，2， FENG Shengbin 1，2， YUAN Xiaoqi 1，2， HAN Peng 1，2， XIE Guwei 1，2， ZHANG Caili 1，2   

  1. 1. Research Institute of Exploration and Development， Changqing Oilfield Company， PetroChina， Xi’an 710018， China； 2. National Engineering Laboratory of Exploration and Development of Low-Permeability Oil & Gas Fields， Xi’an 710018， China
  • Online:2011-12-20 Published:2011-12-20

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Abstract:

Outcrops of Yanchang Formation in the margin of Ordos Basin are widely spread with abundant strata. It is favorable area for research of sedimentary and hydrocarbon generation characteristics in lacustrine basin. According to systematic sampling and measurement of the outcrops of Yanchang Formation, combining with sandstone detrital component analysis, this paper discussed the provenance of Yanchang Formation. It is considered that there exist several provenances from different orientation in Late Triassic in Ordos Basin, including east-north, eastsouth, west-south, west, west-north and north, and sedimentary systems which dominated by the east-north, west and west-north proveniences spread widely. There are great differences of detrital components, heavy mineral assemblages, and interstitial material components and assemblages of sandstones under different sedimentary systems that dominated by different provenances or different depositional stages in the same sedimentary system. Comprehensive studies indicate that the research of sandstone component characteristics of outcrops has great significance for provenience analysis, sedimentary systems division, sand body distribution and favorable reservoir prediction, stratigraphic correlation between outcrops and cores, exploratory well deployment and reservoir reconstruction.

Key words: petroleum seismogeology, exploration and development integration, hydrocarbon detection, isochronic strata unit

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