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논문 기본 정보

자료유형
학술저널
저자정보
Hui Zhang (Institute of Exploration and Development PetroChina Tarim Oilfield Company) Wei Ju (China University of Mining and Technology Xuzhou) Guoqing Yin (Institute of Exploration and Development PetroChina Tarim Oilfield Company) Xinyu Liu (Institute of Exploration and Development PetroChina Tarim Oilfield Company) Zhimin Wang (Institute of Exploration and Development PetroChina Tarim Oilfield Company) Sijia Liu (School of Computer Science and Technology China University of Mining and Technology Xuzhou) Ke Wang (PetroChina Hangzhou Research Institute of Geology) Hui Yang (School of Resources and Geosciences China University of Mining and Technology Xuzhou) Ke Xu (Institute of Exploration and Development PetroChina Tarim Oilfield Company) Wenbo Luan (School of Resources and Geosciences China University of Mining and Technology Xuzhou)
저널정보
한국지질과학협의회 Geosciences Journal Geosciences Journal Vol.25 No.4
발행연도
2021.1
수록면
525 - 536 (12page)

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Within ultra-deep tight sandstone gas reservoirs, natural fractures indicate significant effects on reservoir performance because they can serve as storage spaces for hydrocarbons and improve the permeability. Accurate prediction of natural fractures in ultra-deep reservoirs is critical to the exploration and development of tight gas in Keshen 2 Block of Kuqa Depression. In this study, several conventional logs are selected and the R/S analysis method is introduced to predict the development and distribution of natural fractures in ultra-deep tight sandstone reservoirs. Fracture development coefficient Q is calculated based on the second derivatives of lg(R/S) function and corresponding weight of each log parameter, which matches well with linear fracture density measured from image logs. There is a positive correlation between parameter Q and fracture density, higher Q values usually indicate larger fracture density. Factors causing mismatches between calculated parameter Q and fracture density are also analyzed. Fracture dip angle, fracture filling condition, vertical resolution of logs, multiple interpretations of conventional logs, and lateral detection difference between image and conventional logs may contribute to generate those false appearances. The results in this study are expected to provide new geological references for the exploration and development of ultra-deep tight gas in Keshen 2 Block of Kuqa Depression.

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