新疆石油地质

›› 2015, Vol. 36 ›› Issue (1): 1-1.doi: 10.7657/XJPG20150109

• 论文 •    

鄂尔多斯盆地定北区块太2段致密砂岩气层识别

张威，贾会冲，孙晓   

  1. (中国石化 华北分公司 勘探开发研究院,郑州 450000)
  • 出版日期:2019-01-01 发布日期:1905-07-11

Identification of Tight Sandstone Gas Reservoir of T2 Member in Dingbei Block in Ordos Basin

ZHANG Wei, JIA Huichong, SUN Xiao   

  1. (Research Institute of Exploration and Development, Huabei Company, Sinopec, Zhengzhou, Henan 450000, China)
  • Online:2019-01-01 Published:1905-07-11

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摘要： 鄂尔多斯盆地定北区块太原组2段储集层具有特低孔、特低渗、粒间溶孔发育、石英含量高及裂缝发育等特点。由于研究区砂岩储集层的特殊性，声波时差对孔隙度的敏感度受泥质含量影响较大，电阻率对岩石物性的响应“掩盖”了其对孔隙中流体的响应，声波时差、补偿密度与补偿中子曲线在裂缝和井径扩大的层段出现失真，补偿中子“挖掘效应”存在多解性。针对这些问题，提出了利用电阻率曲线进行辅助井径校正的方法，结合声波时差、补偿密度和补偿中子曲线，对该区太2段砂岩进行孔隙度解释，进一步对气层进行有效识别。

Abstract: The reservoir of T2 member in Dingbei block in Ordos basin is characterized by super-low porosity, super-low permeability, developed intergranular dissolved pores, high quartz content and wide-distribution fractures. The special sandstone reservoir in this area causes the fact that the sensitivity of acoustic transit time to porosity is greatly influenced by shale content, the response of resistivity to petrophysical property conceals the response to pore fluids; distortions of the acoustic logs, density logs and neutron logs often appear in layers or zones with fractures and irregular hole diameter, and the “excavation effect” of neutron logging has to be explained in multiple solutions. This paper proposes a method for hole diameter correction using the resistivity curve, by which, integrated with the acoustic, density and neutron logs, the sandstone porosity of T2 member in this area is interpreted for the purpose of effective identification of the gas reservoir

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