考虑有机质校正的页岩气储层总孔隙度测井评价方法

发布时间：2018-08-29 17:10

【摘要】：准确计算总孔隙度是页岩气储层测井精细评价的关键之一。以涪陵焦石坝地区五峰—龙马溪组页岩气储层为例,依据AA1井元素俘获测井、常规测井数据、岩芯分析总孔隙度和总有机碳实验数据,分析了Herron总孔隙度模型的适用性,研究认为:模型不能准确计算目标区块层位的总孔隙度,原因在于:(1)视密度孔隙度和视中子孔隙度的计算中,将岩石等效为骨架和孔隙两部分,忽视了页岩储层有机质的存在;(2)模型中的权值系数是依据有限岩芯数据通过最小二乘法拟合得到,有一定的区域适用性。在此认识的基础上,提出了一种改进的评价页岩气储层总孔隙度方法,将该方法应用到焦石坝地区五峰—龙马溪组页岩气储层XX1井的总孔隙计算中,相对于Herron总孔隙度模型,精度有了明显的提高,且该方法操作简单。
[Abstract]:Accurate calculation of total porosity is one of the keys to fine logging evaluation of shale gas reservoir. Taking the shale gas reservoir of Wufeng Longmaxi formation in Fuling Jiaoshiba area as an example, based on the element capture logging of AA1 well, the conventional logging data, the core analysis of total porosity and total organic carbon experimental data, the applicability of the Herron total porosity model is analyzed. The results show that the model can not accurately calculate the total porosity of the target block because: (1) in the calculation of apparent density porosity and apparent neutron porosity, rock is equivalent to skeleton and pore. The existence of organic matter in shale reservoir is neglected. (2) the weight coefficient in the model is obtained by least square method according to the finite core data, which has certain regional applicability. On the basis of this understanding, an improved method for evaluating the total porosity of shale gas reservoir is put forward. The method is applied to the calculation of total porosity of XX1 well of Wufeng Longmaxi formation shale gas reservoir in Jiaoshiba area, relative to the total porosity model of Herron. The precision is improved obviously, and the operation of this method is simple.
【作者单位】：长江大学油气资源与勘探技术教育部重点实验室;长江大学非常规油气湖北省协同创新中心;中国石化勘探分公司勘探研究院;
【基金】：国家自然科学基金资助项目(41404084) 油气资源与勘探技术教育部重点实验室(长江大学)开放基金资助项目(K2016-09)
【分类号】：P618.13;P631.81

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