鄂尔多斯盆地南梁地区长4+5 油层组储层特征

doi:10.3969/j.issn.1673-8926.2012.04.007

Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (4): 34-39.doi: 10.3969/j.issn.1673-8926.2012.04.007

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Reservoir characteristics of Chang 4+5 oil reservoir set in Nanliang area, Ordos Basin

XU Li ^1，2， WANG Yiping³， DUAN Yi¹， XING Lantian¹， WU Baoxiang¹， ZHANG Xiaoli ^1，2

（1. Key Laboratory of Petroleum Resources Research， Institute of Geology and Geophysics， Chinese Academy of Sciences， Lanzhou 730000， China； 2. Graduate School of Chinese Academy of Sciences， Beijing 100049， China； 3. No. 2 Oil Production Plant， PetroChina Changqing Oilfield Company， Qingyang 745100， China

Online:2012-08-20 Published:2012-08-20

Abstract

Abstract:

The Chang 4+5 oil reservoir set which is composed of Chang 4+52 and Chang 4+51 sublayers in Nanliang area in Ordos Basin is an important oil reservoir. Based on petrological and physical features, this paper studied the characteristics of Chang 4+5 oil reservoir set and evaluated reservoir properties. The result shows that the reservoir sandstone is compose of arkose and lithic arkose; the pore types are mainly intergranular pores and dissolved pores; the main throat type is fine to micro-fine throat and the reservoir displays high displacement pressure. It indicates that Chang 4+5 oil reservoir set belongs to ultra-low permeability reservoir. Sedimentation and diagenesis are the main factors of ultra-low permeability. Sedimentation controlled the distribution of reservoir. Compaction and cementation decreased the primary pores, while chlorite-cementation, dissolution and hydrocarbon emplacement play constructive role of the porosity building. Based on lithology and physical properties, the reservoir rocks can be divided into two types. The favorable reservoir should be in the subsea distributary channel sand bodies controlled by sedimentation.

Key words: fault, reservoir forming, Chang 9 reservoir, Jiyuan Oilfield

XU Li， WANG Yiping, DUAN Yi， XING Lantian， WU Baoxiang， ZHANG Xiaoli. Reservoir characteristics of Chang 4+5 oil reservoir set in Nanliang area, Ordos Basin[J].Lithologic Reservoirs, 2012, 24(4): 34-39.

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