测井资料在优质页岩气储层识别中的应用——以鄂尔多斯盆地东南部长7段黑色页岩为例

为了利用常规测井资料研究页岩气储层,通过岩电关系、ΔlgR法、裂缝测井解释模型探讨了鄂尔多斯盆地东南部长7段黑色页岩的优质储层识别问题.结果表明:长7段成熟的富有机质泥页岩普遍具有高自然伽马、高自然电位、高声波时差和低密度的电性特征,有机碳质量分数普遍大于2%,均值3.15%,裂缝发育段主要集中在顶部和中下部,且以水平缝或低角度缝为主.研究区长7段黑色页岩段的顶部和中下部具备形成页岩气藏的良好地质条件,是页岩气勘探的有利层段.

Application of logging data in the identification of high quality shale gas reservoirs: an example from the Chang-7 black shale in southeastern Ordos Basin

In order to study shale gas reservoirs by utilizing conventional logging data,the identification of high quality shale gas reservoirs of the Chang-7 black shale in southeastern Ordos Basin is discussed by means of rock-electricity relation,ΔlgR method and fracture logging interpretation model. The results indicate that the Chang-7 mature organic-rich shale generally has the characteristics of high GR logging response,high SP logging response,high acoustic logging response and low density logging response; its TOC mass fraction is generally more than 2% ,and the average is 3. 15% ; the fractures develop mainly at the top and in the mid-lower part of the reservoir,and they are mainly bedding fractures or low angle fractures. At the top and in the mid-lower part of the Chang-7 black shale in the studied area,there is good geological conditions for forming shale gas reservoirs,where is favorable sections for shale gas exploration.