Full
WANG Tengyu,born in 1996,is a Ph.D. candidate. He is currently engaged in sedimentary research. E-mail: wangty185@gmail.com.
Outline
To reduce the subjectivity in indicator weighting and the fuzziness of grading criteria in favorable area evaluation of tight sandstone reservoirs,we develop an integrated method that couples combined weighting with a normal cloud model,and apply it to the X subunit of the Member 3 of the Qingshankou Formation(Q3)in the Qianshen Block,southern Songliao Basin. First,subjective weights are derived from expert judgment using the Analytic Hierarchy Process(AHP). Objective weights are then obtained from the dataset using the CRITIC method. The two sets of weights are finally integrated to produce combined weights,improving both geological rationality and data-driven objectivity. Meanwhile,a normal cloud model is introduced to characterize uncertainty during grade assignment. Standard cloud parameters—expectation(Ex),entropy(En),and hyper-entropy(He)—are determined from the score intervals of evaluation grades under constraints of a boundary membership threshold,enabling a flexible mapping between evaluation grades and measured data. Results show that sedimentary facies belt,oil-bearing property,and effective thickness are the dominant controls on favorable areas,with combined weights of 0.253,0.182,and 0.124,respectively. Evaluation of 20 wells identifies 12 wells for Class Ⅰ,five wells for Class Ⅱ,and three wells for Class Ⅲ wells;the outcomes show 95% agreement with previous interpretations,with a Cohen’s kappa coefficient(κ)of 0.91. The method therefore provides a practical and reliable tool for favorable area evaluation of tight sandstone reservoirs.
324
154
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
