鄂尔多斯盆地镇原地区长 8 油层组低渗透储层特征

doi:10.3969/j.issn.1673-8926.2014.01.005

Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (1): 29-35.doi: 10.3969/j.issn.1673-8926.2014.01.005

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Low permeability reservoir characteristics of Chang 8 oil reservoir set in Zhenyuan area, Ordos Basin

TIAN Tian¹， WANG Haihong²， ZHENG Rongcai¹， HOU Changbing²， WANG Changyong¹

1. Institute of Sedimentary Geology， Chengdu University of Technology， Chengdu 610059， China； 2. The Fourth Section of Ultra-low Permeability Reservoirs， PetroChina Changqing Oilfield Company， Qingyang 745100, Gansu， China

Online:2014-02-05 Published:2014-02-05

Abstract

Abstract:

Based on core observation, cast thin sections, scanning electron microscopy and physical properties, combined with well logging interpretation, this paper studied the reservoir characteristics of Chang 8 oil reservoir set in Zhenyuan area, Ordos Basin. The result shows that the reservoir suffered acidic alteration with secondary pores developed. The reservoir space is dominated by remaining primary intergranular pores, intergranular dissolved pores and microcracks. Intercrystalline pores between clay minerals have also a little contribution. The reservoirs are controlled by sedimentary facies, detrital composition, diagenesis and tectonism. The favorable microfacies controlled the spatial distribution of the reservoirs. The clastic composition and grain size are directly related to physical properties. The diagenesis has both good and bad effects. The compaction and cementation made the majority of primary pores lost. The dissolution formed secondary pores which greatly improved the porosity and permeability, and they are crucial to the high-quality reservoirs.

Key words: sequence-based lithofacies and paleogeography, paleosalinity, palaeo-lake strandline, delta depositional system, Chang9 oilreservoir set, Longdong area, Ordos Basin

TIAN Tian， WANG Haihong， ZHENG Rongcai， HOU Changbing， WANG Changyong. Low permeability reservoir characteristics of Chang 8 oil reservoir set in Zhenyuan area, Ordos Basin[J].Lithologic Reservoirs, 2014, 26(1): 29-35.

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