Oil & Gas Geology ›› 2012, Vol. 33 ›› Issue (3): 467-478.doi: 10.11743/ogg20120317

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Reservoir characteristics of low porosity and permeability sandstone of Member Ⅰ of Xiashihezi Formation in Daniudi gas field,Ordos Basin

Hou Ruiyun   

  1. SINOPEC Huabei Company, Zhengzhou, Henan 450006, China
  • Received:2012-04-08 Revised:2012-05-13 Online:2012-06-28 Published:2012-07-10

Abstract:

Daniudi gas field is located in the northeastern part of Yishan slope in Ordos Basin.One of the major reservoirs is the braided channel sandstone in Member Ⅰ of the Lower Permian Xiashihezi Formation.The sandstones consists mainly of lithic sandstones and lithic quartz sandstones with medium compositional and structural maturity.The sandstone reservoir is of strong heterogeneity.The porosity and permeability of the reservoirs are 4-14% and (0.05-2)×10-3 μm2 respectively, which repsent the typical characteristics of low porosity and permeability reservoirs or even tight reservoirs.The reservoir is at A2-B substage of the late diagenetic stage.Mechanical compaction,quartz overgrowth and calcite cementation are the main diagenesis for decreasing porosity of sandstone.Intergranular dissolution pore is the major pore type.Sedimentary microfacies,lithology and diagenesis are the main factors influencing reservoir properties.Using grey relational analysis(GRA)method,this paper divides the reservoirs in Member I of Xiashihezi Formation into three types based on multiple parameters such as sedimentary microfacies,reservoir macro-and micro-charac teristics.Type Ⅰ reservoirs have relatively high porosity and permeability,while type Ⅱ has relatively moderate porosity and permeability.The distributions of three different types of reservoirs are predicted and the evaluation criteria of the reservoirs in Member I of Xiashihezi Formation are also established.

Key words: low porosity and permeability, reservoir characteristics, grey relational analysis, formation evaluation, Member 1 of Xiashihezi Formation, Daniudi gas field

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