蜀南地区茅口组缝洞型储层有效性评价

Evaluation on effectiveness of fracture-cavity reservoir in Maokou Formation,Southern Sichuan

本文在储层测井响应特征的基础上,运用岩心物性、压汞等分析资料,从储层岩相、岩性、裂缝、孔洞有效性等四个方面进行储层有效性评价。研究认为茅口组有效储层分布储层分布特征:茅二段储层有效性较好、茅三段次之,茅四和茅一段相对较差。归根究底,还是溶蚀孔洞发育程度影响因素较大,裂缝的发育有效地改善了溶蚀孔洞的连通性,增强了储层的渗流能力。

The cavity, fracture, lithology and petrofacies of the reservoir are evaluated by use of physical properties of core andmercury pressure based on log response characteristics of the reservoir. The results show that the effective reservoir distribution in MaokouFormation is： Mao-II reservoir has the best effectiveness, Mao-III follows by Mao-II, Mao-IV and -I are relatively less effective.In conclusion, the growth of denudation pores and cavities contributes much to the reservoir distribution, the growth of fractureimproves the connectivity of denudation pores and cavities as well as the seepage of the reservoir.