• 应用地球物理学Ⅰ（油气及金属矿产地球物理勘探） •

### 基于T2和毛管压力分类转换的渗透率计算新方法

1. 1. 中国石化西南油气分公司勘探开发研究院,成都 610016
2. 中国石油化工股份有限公司上海海洋油气分公司勘探开发研究院,上海 200120
• 收稿日期:2018-12-11 修回日期:2019-05-23 出版日期:2019-10-28 发布日期:2019-10-28
• 作者简介:王迪,1989年生,工程师,毕业于西南石油大学地球科学与技术学院,主要研究方向为油气地质和测井资料解释.(E-mail: wangdi.shhy@sinopec.com)
• 基金资助:
中国石化集团公司科研项目“东海深层气藏开发关键技术研究”(P15124)

### New method of permeability calculation based on classification conversion of T2 spectrum and capillary pressure curves

WANG Di1,CHEN Min2,WANG Jian-wei2,SHENG Zhi-chao2,YAN Shu-mei2,MA Mei-yuan2,LI Dong-zhe1,ZHENG Xin2

1. 1. Exploration and Development Research Institute, Sinopec Southwest Oil and Gas Company, Chengdu 610016, China
2. Institute of Exploration and Development, Sinopec Shanghai Offshore Oil and Gas Company, Shanghai 200120, China
• Received:2018-12-11 Revised:2019-05-23 Online:2019-10-28 Published:2019-10-28

Abstract:

For the reservoirs of low to super-low porosity and low to super-low permeability with significant heterogeneity, it is always located near the critical point of natural productivity. The physical properties can’t be judged only by porosity, so the work of evaluation and prediction of productivity should be established on the base of accurate calculation of permeability. However, because of significant heterogeneity, multiple and complex influence factors of conventional log curves and a lack of samples caused by offshore drilling, satisfactory effect of permeability calculation by conventional log curves can’t always be achieved. The method based on conversion of T2 spectrum and capillary pressure curve, which takes the advantage of NMR which can realizes continuous measurement of whole length and capillary pressure which can reflects pore structure, realizes breakthrough in the aspect of permeability calculation. After several years’ development, this method has become a comparatively ripe method, but a questions is usually ignored in the research:that is if the pore-throat radius obtained by T2 and capillary pressure curve are the same physical parameter? And if there is any precondition existed ahead of the conversion? According to this question, on the basis of analyzing experiment principle of NMR and capillary pressure, a contrast method is used by rate-controlled mercury penetration’s pore-throat distribution and T2 spectrum of NMR, and respective pore-throat radius’ connotation is summarized, which proves that there is precondition existed ahead of the conversion, and the precondition is stable pore-throat radius ratio. On the premise of precise analysis of sedimentary environment and diagenesis, a macro parameter, porosity, is chosen as classification standard, and as a result reservoirs is divided into several sections, each one of which has relatively stable pore-throat radius ratio, and then the work of conversion and permeability calculation is realized. It is proved that permeability calculated by the method could reflect the heterogeneity more accurately, and it also has better consistency with productivity characteristics.