Comprehensive Assessment of fractures in the volcanic Basement Buried Hill Reservoirs: A Case Study of Volcanic Reservoir in 4-2 Region of Karamay Oilfield

FAN Cun-hui, ZHOU Kun, QIN Qi-rong, ZHOU Lin, TAO Jia-li, WANG Xiang-yang, LV Xu-yang, ZHAO Yu-xin, LIU Xiao-hong

doi:10.11764/j.issn.1672-1926.2014.12.1925

2014 , Vol. 25 >Issue 12: 1925 - 1932

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.12.1925

Comprehensive Assessment of fractures in the volcanic Basement Buried Hill Reservoirs: A Case Study of Volcanic Reservoir in 4-2 Region of Karamay Oilfield

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1.School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China;
2.College of Energy Resources,Chengdu University of Technology,Chengdu 610500,China;
3 Hubei Cooperative Innovation Center of Unconventional Oil and Gas,Yangtze University,Wuhan 430100,China;
4.PetroChina Southwest Oil & Gas Field Company,Chengdu 610041,China

Received date: 2014-02-17

Revised date: 2014-05-22

Online published: 2019-09-18

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Abstract

The Carboniferous volcanic reservoir of 4-2 region in Karamay Oilfield is a typical volcanic basement buried hill volcanic reservoir.In order to demonstrate the fracture characteristics,and distribution rule of the Carboniferous volcanic reservoir,cores,flakes,well-log data,and other experimental materials are used to study the fracture characteristics.Three different methods are used to comprehensively predict the distribution of fractures on the longitudinal and on flat surface.The results show that the fracture types in Carboniferous volcanic reservoir of 4-2 region include tectonic fracture,weathered fracture,diagenetic fracture and structure-weathering fracture and tectonic fracture.Weathered fractures are the dominant fractures|fracture extendency is mainly between 10cm and 30cm|fracture dip is big and is dominated by 30°-60° and greater than 80°.The average density of core fracture is 10-15 strips /10cm.The comprehensive evaluation of fractures showed that: On the longitudinal,fracture development segments are mainly located in the area about 30 to 150 meters below the ancient weathering crust of top Carboniferous|on the flat surface,the advantageous fracture growth area distributed in the well areas of Ke114-J354-J353-J352,J153,both sides of J45 fault,from the well area of J332-J324-J336 -J340 to the north Ke-Wu fault.

Key words： Basement buried hill; Volcanic rock; Fracture; Comprehensive evaluation; Carboniferous; 4-2 region

Cite this article

FAN Cun-hui, ZHOU Kun, QIN Qi-rong, ZHOU Lin, TAO Jia-li, WANG Xiang-yang, LV Xu-yang, ZHAO Yu-xin, LIU Xiao-hong . Comprehensive Assessment of fractures in the volcanic Basement Buried Hill Reservoirs: A Case Study of Volcanic Reservoir in 4-2 Region of Karamay Oilfield[J]. Natural Gas Geoscience, 2014 , 25(12) : 1925 -1932 . DOI: 10.11764/j.issn.1672-1926.2014.12.1925

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