Micro-fractures in extra-low permeability reservoir of Yanchang Formation in Ordos Basin

HE Zongbin; NI Jing; WU Dong; LI Yong; LIU Liqiong; TAI Huaizhong

doi:10.3969/j.issn.1673-8926.2007.04.007

Lithologic Reservoirs >

2007 , Vol. 19 >Issue 4: 40 - 44

DOI: https://doi.org/10.3969/j.issn.1673-8926.2007.04.007

Micro-fractures in extra-low permeability reservoir of Yanchang Formation in Ordos Basin

HE Zongbin ,
NI Jing ,
WU Dong ,
LI Yong ,
LIU Liqiong ,
TAI Huaizhong

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1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
2. Research Institute of Petroleum Exploration and Development, Changqing Oilfield Company, PetroChina, Xi’an 710021, China

Online published: 2007-12-15

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Abstract

Micro- fracture is one of the main flow passages for low permeability reservoir. The reservoir of Yanchang Formation in Longdong area is extra- low permeability reservoir. By using the frequency analysis methods such as polarizing microscope and SEM, the occurrence, features, surface density, planar distribution rules and the contribution to permeability of the micro- fractures are analyzed. It points out that the microfractures are widely developed in this area and controlled by factors of sedimentation, diagenesis, tectonic lateral compression, mineral component, structural tectonics, hidden fracture of underlying strata and so on. The surface density of the micro- fracture is closely related to the permeability. Micro- fracture is the key factor which should be considered in oilfield development and deployment.

Key words： nuclear magnetic resonance logging; dual-TE; intrinsic relaxation time T_2int; hydrocarbon saturation

Cite this article

HE Zongbin , NI Jing , WU Dong , LI Yong , LIU Liqiong , TAI Huaizhong . Micro-fractures in extra-low permeability reservoir of Yanchang Formation in Ordos Basin[J]. Lithologic Reservoirs, 2007 , 19(4) : 40 -44 . DOI: 10.3969/j.issn.1673-8926.2007.04.007

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