溶孔发育的含沥青质碳酸盐岩核磁共振特征分析——以四川盆地高磨地区龙王庙组储层为例

发布时间：2018-05-06 09:28

本文选题：高磨地区 + 核磁实验　；参考：《天然气地球科学》2017年08期

【摘要】：四川盆地高磨地区龙王庙组储层溶洞、溶孔发育,且多含有沥青侵染暗色斑块。在核磁实验中,样品周表面发育的大量溶孔无法被饱和,从而导致这部分孔洞的核磁信号无法被测量到。在测量烘干岩样时发现岩石干样也会产生一定的核磁信号。因此,针对样品周表溶孔发育和干样信号的问题,设计了一系列对比实验来验证影响的大小及其校正的方法。通过包裹样品周表、包裹样品两端以及裸样测量3种状态下的孔隙度和含水饱和度以及与常规孔隙度、饱和度测量方案值对比表明,包裹对测量准确度有明显的提升。经干样核磁信号与纯沥青核磁信号、沥青—泥砂混合核磁信号对比实验证明该地区碳酸盐岩储层干样的信号为沥青质所产生。扣除干岩样核磁信号后所求得的孔隙度、饱和度与常规测量方案有更好的吻合度。进一步对比不同实验状态下同一样品的T2截止值变化表明,T2截止值不受周表孔洞影响,但受沥青质信号的影响。
[Abstract]:The reservoir caverns of Longwangmiao formation in Gaomo area of Sichuan Basin have developed caverns and dissolved pores, and most of them contain bituminous patches. In the nuclear magnetic experiment, a large number of dissolved pores developed on the surface of the sample can not be saturated, which results in the nuclear magnetic signal of this part of the hole can not be measured. In the measurement of dried rock samples, it is found that some nuclear magnetic signals will be produced in dry rock samples. Therefore, a series of comparative experiments were designed to verify the size of the effect and the method of correction for the development of the sample's peripheral dissolved pore and the signal of dry sample. The measurement of porosity and water saturation at the two ends of the sample and the bare sample and the comparison with the conventional porosity and saturation measurements show that the accuracy of the measurement is improved obviously by wrapping the sample table, the two ends of the wrapped sample and the bare sample. The contrast experiment between dry sample nuclear magnetic signal and pure asphalt nuclear magnetic signal and mixed bitumen sand nuclear magnetic signal shows that the dry sample signal of carbonate reservoir in this area is produced by asphaltene. The porosity obtained by deducting the nuclear magnetic signals of dry rock samples shows that the saturation is in better agreement with the conventional measurement scheme. Further comparison of T 2 cutoff values of the same samples under different experimental states shows that the T 2 cutoff values are not affected by peripheral pores but by asphaltene signals.
【作者单位】：中国石油集团测井有限公司;中国地质大学(北京)能源学院;
【基金】：中国石油股份公司重大科技专项深层高温高压测井岩石物理与成像评价技术研究(编号:2014E-3205) 中国石油集团公司重大科技专项(编号:2014E-3205) 国家“863”计划(编号:2013AA064602)联合资助
【分类号】：P618.13;P631.81

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