Reservoir characteristics of N1—N21 in Shaxi zone of Gasikule Oilfield

  • WANG Xiwen ,
  • SHI Lanting ,
  • YONG Xueshan ,
  • YNAG Wuyang
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  • 1. Southwest University of Petroleum, Chengdu 610500, China;
    2. Qinghai Oilfield Company, PetroChina, Dunhuang 736202, China

Online published: 2007-12-15

Abstract

The data of thin section, cast slice, SEM, X-ray diffraction, mercury injection combining with geological information and physical properties analysis are applied to analyze the characteristics of N1—N21 and the difference between the upper wall and lower wall of fault Ⅱ in Shaxi zone. The result shows that the reservoir in the study area is clastic reservoir which experienced destructive diagenesis of compaction and cementation and constructive diagenesis of dissolution and tectonism. The diagenetic stage is in the period from early diagenesis subage B to late diagenesis subage A1. The pore structure types are intergranular pore, intragranular pore, and fracture etc. The reservoir of N1—N21 is middle pore and low permeability reservoir with poor property. Distributary channel sand bodies are the foremost reservoirs in the study area. The compositional maturity of the lower wall is much better than that of the upper wall of fault Ⅱ, however the cement content is on the contrary. The sandstone in upper wall is mainly the feldspathic litharenite, and in the lower wall it is mainly the arkose. The pore in upper wall is mainly intergranular pore, however, fracture developed well in lower wall. The reservoir is medium porosity and medium permeability in upper wall but low porosity and low permeability in lower wall.

Cite this article

WANG Xiwen , SHI Lanting , YONG Xueshan , YNAG Wuyang . Reservoir characteristics of N1—N21 in Shaxi zone of Gasikule Oilfield[J]. Lithologic Reservoirs, 2007 , 19(4) : 34 -39 . DOI: 10.3969/j.issn.1673-8926.2007.04.006

References

[ 1] 姜在兴著.沉积学[M] .北京: 石油工业出版社, 2003: 150- 160.
[ 2] 郑荣才, 王昌勇, 李虹, 等.鄂尔多斯盆地白豹—华池地区长6油层组物源区分析[ J] .岩性油气藏, 2007, 19(1):32- 38.
[ 3] 朱小燕, 王斌婷, 胡建基, 等.南庄地区三叠系长6储集层研究[ J] .岩性油气藏, 2007, 19( 1) : 77- 80.
[ 4] 马达德, 牟中海, 何琰, 等. 尕斯库勒油田砂西区块E31油藏Ⅰ- 6
小层非均质性综合研究[ J] .西南石油学院学报, 2004, 26(4) : 5- 9.
[ 5] 马鸣, 李建明, 马力宁. 尕斯库勒油田N1—N21油藏储层特征与评价[ J] .河南石油, 2005, 19( 4) : 6- 9.
[ 6] 罗蛰潭, 王允诚著.油气储集层的孔隙结构[M] .北京: 科学出版社, 1986:60- 66.
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