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高校地质学报 ›› 2020, Vol. 26 ›› Issue (3): 323-332.DOI: 10.16108/j.issn1006-7493.2019047

• 能源地质学 • 上一篇    下一篇

四川盆地川南地区五峰组—龙马溪组页岩储层分类评价

郭建林，贾成业，何东博，李林，朱汉卿，周倚，刘畅   

  1. 1. 中国石油勘探开发研究院，北京100083；
    2. 中国石油浙江油田公司，杭州310023；
    3. 中国地震局地震研究所，武汉430071；
    4. 中国石油大学（北京），北京102249
  • 收稿日期:2019-05-21 修回日期:2019-08-23 出版日期:2020-06-20 发布日期:2020-06-28

Classified Evaluation of Shale Reservoirs in the Ordovician Wufeng to Silurian Longmaxi Formations in the Southern Sichuan Basin

GUO Jianlin，JIA Chengye，HE Dongbo，LI Lin，ZHU Hanqing，ZHOU Yi，LIU Chang   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. PetroChina Zhejiang Oilfield Company, Hangzhou 310023, China;
    3. Institute of Seismology, China Earthquake Administration, Wuhan 430071, China;
    4. China University of Petroleum, Beijing 102249, China
  • Received:2019-05-21 Revised:2019-08-23 Online:2020-06-20 Published:2020-06-28

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摘要： 文章在资源评价和有利区优选的基础上，建立了川南地区五峰组—龙马溪组页岩储层分类评价标准。确定孔隙度（Φ） 大于3%，含气饱和度（Sg） 高于30%，岩石骨架密度（DEN） 低于2.7 g/cm3，脆性指数（BI） 高于40%时，对应含气量（Vt） 高于1 m3/t，可识别出储层与非储层，是有效储层识别的标准。采用地质工程一体化评价思路，选取含气量表征页岩储层物质基础，与孔隙度和有机质丰度正相关；选取脆性指数评价工程可压性，与硅质和碳酸盐岩含量正相关，明确了含气量和脆性指数可综合表征页岩储层地质和工程两方面特征。进一步将有效储层划分为三类：I类储层含气量（Vt） 高于4 m3/t，脆性指数（BI）高于50%；II类储层含气量与脆性指数中任何一项低于4 m3/t或50%；三类储层含气量（Vt）介于1~4m3/t，脆性指数（BI） 为40%~50%。川南地区五峰组—龙一1亚段各小层品质较好，以I、II类储层为主，局部为III类储层。采用该分类评价标准，评价水平井实际钻遇储层品质，Ⅰ类储层比例与气井测试产量、EUR间呈正相关，且当Ⅰ类储层钻遇率高于50%，气井测试产量超过15×104 m3/d概率达到92%，对应气井EUR在8000×104 m3以上，达到效益开发的要求。

关键词: 海相页岩, 五峰组, 龙马溪组, 含气量, 脆性指数, 分类评价, Ⅰ类储层, 钻遇率

Abstract: On the basis of resource evaluation and favorable area evaluation, this paper established a set of classified evaluation criteria for shale reservoirs in the Wufeng-Longmaxi Formations in the southern Sichuan Basin. The criteria for effective reservoir identification include porosity (Φ) greater than 3%, gas saturation (Sg) higher than 30%, density of rock matrix (DEN) below 2.7 g/cm3, brittleness index (BI) over 40% and gas contents (Vt) higher than 1 m3/t. These criteria can distinguish the reservoirs and non-reservoirs. Based on the conception of geological and engineering integration, gas contents (Vt) has been selected to characterize the resource foundation of shale reservoirs, which is positively correlated with porosity and organic matter abundance. The brittleness index (BI) positively correlating with siliceous and carbonate contents has been selected to characterize the compressibility. Gas contents and brittleness index can comprehensively characterize the geological and engineering characteristics of reservoirs. Effective shale reservoirs have been further divided into three types: Type I with gas contents over 4 m3/t and brittleness index greater than 50%; Type II with gas contents lower than 4 m3/t or brittleness index less than 50%; Type III with gas contents from 1 m3/t to 4 m3/t and brittleness index between 40%-50%. Reservoirs in the Wufeng Formation and the low member of the Longmaxi Formation have a good quality which mainly consist of Types I and II and locally Type III. According to the criteria established in this paper, evaluations for reservoir quality of horizontal drillings have been conducted, and correlations between penetration rate of Type I reservoir, testing production and estimate ultimate recovery (EUR) are positive. Horizontal wells with drilling efficiency of Type I reservoir over 50% have probability of 92% for testing production over 15×104 m3/d and the corresponding EUR exceeding 8000×104 m3, meeting the requirements of economic development.

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