地质科技情报2018，Vol.37Issue(4)：167-174,8.DOI:10.19509/j.cnki.dzkq.2018.0422
川东南丁山地区龙马溪组富有机质页岩脆性评价
Brittleness Evaluation of Organic-Rich Shale in Longmaxi Formation in Dingshan Area, Southeastern Sichuan
摘要
Abstract
The brittleness evaluation of shale reservoirs is of great significance for determining the favorable stratigraphic zone of shale gas reservoirs.Comprehensive utilization of core data, logging data, X-ray diffraction data, rock mechanics experiments data and other data is adopted to study the brittleness characteristics of shale in Longmaxi Formation in Dingshan area together with rock mineral composition method and elastic parameter method, before the evaluation of shale reservoir′s fracture property.The results show that the brittleness of the shale in the study area is mainly affected by brittle minerals such as quartz, feldspar and pyrite, and the mineral brittleness index is 36.2％-62.7％, with an average of 48.1％.Under different confining pressure conditions, shale failure mode is mainly split type, double shear type, single shear type, while the elastic brittleness index is 40.7％-61.6％, with an average of 52.6％.Compared with other shale gas production zones at home and abroad, the shale index level of the study area is medium.The brittle minerals, the brittleness index and the TOC content have good correlation, and the fracture property is better.The brittleness of the Wufeng Formation-Longmaxi Formation is located at 2 027.0-2 054.2 min Well DY1, and the brittleness index is more than 50％.The production capacity of fracturing can be obtained, and this matches well with the actual production.关键词
页岩储层/脆性/矿物组分/弹性参数/龙马溪组/丁山地区Key words
shale reservoir/brittleness/mineral composition/elastic parameter/Longmaxi Formation/Dingshan area分类
石油、天然气工程引用本文复制引用
钟城,秦启荣,周吉羚,胡东风,魏志红..川东南丁山地区龙马溪组富有机质页岩脆性评价[J].地质科技情报,2018,37(4):167-174,8.基金项目
"十三五"国家科技重大专项"四川盆地重点地区应力与裂缝发育规律及评价方法研究"(2017ZX05036003-003) （2017ZX05036003-003）
四川省应用基础研究项目"冲断带前缘地腹高陡逆断裂形成机理及裂缝发育量预测"(2017JX0176) （2017JX0176）
