中南大学学报（自然科学版）2018，Vol.49Issue(5)：1160-1168,9.DOI:10.11817/j.issn.1672-7207.2018.05.018
湘西北下寒武统牛蹄塘组页岩气储层可压裂性评价
Fracability evaluation of shale gas reservoir in Lower Cambrian Niutitang formation, northwestern Hunan
摘要
Abstract
The effect of macro and micro parameters on fracability of Lower Cambrian Niutitang shale of northwestern Hunan was evaluated based on field investigations and sample analysis. The quantitative evaluation of fractured rate of shale was achieved by combining SEM technique and ImageJ. A mathematical model based on the combination weight method was established to quantitatively evaluate the shale fracability. The results show that the Lower Cambrian Niutitang formation shale in the study area has great content of brittle mineral, high brittleness index, high degree of thermal evolution and well developed micro-fractures and pores, possession of advantageous conditions for the fracturing of shale gas reservoir. The fracability of the shale Lower Cambrian Niutitang is 0.504 0. And the optimum area for fracturing in the Niutitang Formation shale is Xianfeng, Longshan, Sangzhi and Cili due to their relatively higher fracability indexes. Besides, shale fracability can be divided into three levels according to the reservoir parameters. The shale with low fracability (fracability index is less than 0.277 4) cannot be stimulated effectively. Shale with the medium fracability (fracability index range is [0.277 4, 0.436 3] can be stimulated effectively but the effect is actually modest. Shale with high fracability (fracability index range (0.436 3, 0.653 8] is the best interval to be fractured. It is better to choose shale with fracability index above 0.436 3.关键词
湘西北/页岩气储层/下寒武统牛蹄塘组/组合赋权法/可压裂性评价Key words
northwestern Hunan/shale gas reservoir/Lower Cambrian Niutitang/combination weight method/fracability evaluation分类
能源科技引用本文复制引用
吴晶晶,张绍和,曹函,孙平贺..湘西北下寒武统牛蹄塘组页岩气储层可压裂性评价[J].中南大学学报（自然科学版）,2018,49(5):1160-1168,9.基金项目
国家自然科学基金资助项目(41302124) （41302124）
有色金属成矿预测与地质环境监测教育部重点实验室(中南大学)开放基金资助项目(2016YSJS009)(Project(41302124)supported by the National Natural Science Foundation of China （中南大学）
Project(2016YSJS009)supported by Open Research Fund of Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Education(Central South University)) （2016YSJS009）
