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Diagenesis characteristics of Chang 9 reservoir of Yanchang Formation in Zhenjing Area(PDF)

西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

Issue:
2016年06期
Page:
837-842
Research Field:
Publishing date:

Info

Title:
Diagenesis characteristics of Chang 9 reservoir of Yanchang Formation in Zhenjing Area
Author(s):
ZHANG Meng-ting12LI Wen-hou12BAI Jin-li12ZHANG Qian12LI Zong-lin3
1.Department of Geology,Northwest University,Xi'an 710069,China;
2.State Key Laboratory of Continental Dynamics,Xi'an 710069,China;
3.School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China
Keywords:
diagenesis physical properties Chang 9 reservoir Zhenjing area
PACS:
TE 122.2
DOI:
10.13800/j.cnki.xakjdxxb.2016.0613
Abstract:
Chang 9 which is newly discovered is one of the key oil-bearing strata in zhenjing area of Ordos Basin.The reservoir of oil and gas is closely related to diagenesis,so it is important to study the diagenesis of the study area.Based on the pore casting thin sections,scanning electron microscopy(SEM)and analysis of physical properties,the diagenesis characteristics and the control of diagenesis of Chang 9 reservoir in Zhenjing area,Ordos Basin,are studied in detail.The study area are dominated by lithic arkose sandstones,arkose and feldspathic lithic sandstone.The reservoir rock mainly developed intergranular pores and intragranular dissolved pores,which has undergone complex diagenesis,mainly including compaction,cementation,alteration and corrosion.The reservoir rock are now mainly in middle diagenetic stages of A period-of early B period.After the quantitative evaluation research of pore formation and loss of different diagenesis in sandstone reservoirs,compaction causes the porosity decreased the most,with an average of 57.84%,cementation causes the porosity decreased an average of 32.3%.The dissolution due to 37.98% of the apparent dissolution percentage can effectively improve the physical properties of the reservoir,and the alteration on the physical properties of the reservoir has slight effects.

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Last Update: 2016-11-28