Quantitative characterization of bioturbation based on digital image analysis of the Ordovician core from Tahe Oilfield of Tarim Basin
Niu Yongbin1, 2, Cui Shengli1, Hu Yazhou1, Zhong Jianhua3, Wang Peijun4
1 Institute of Resource and Environment,Henan Polytechnic University,Jiaozuo 454003,Henan.; 2 Key Laboratory of Biogenic Traces and Sedimentary Minerals of Henan Province,Jiaozuo 454003,Henan.; 3 School of Geosciences,China University of Petroleum(East China),Qingdao 266580,Shandong.; 4 Development Affairs of Tarim Oilfield,PetroChina,Korla 841000, Xinjiang;
Abstract：Bioturbation has a great influence on the carbonate reservoir properties of “matrix reservoir” of the Ordovician in Tahe Oilfield of Tarim Basin. With the help of Bioturbated Digital Analysis Images Package of Adobe® Photoshop® CS6,the study was carried on the core of the Ordovician from Tahe Oilfield to identify and estimate quantitatively the area that was bioturbated in the core digital image. The results show that: (1)Within the methods of Bioturbated Digital Analysis Images Package,“Similar Pixel Selection Method” and “Magic Wand Method” are the most effective to identify and estimate quantitatively bioturbation and have different ranges of application. (2)The Similar Pixel Selection Method is suitable for the samples with high bioturbation,small size and high diversity. When there are considerable differences between the infill of bioturtation and the surrounding rocks,“Select Similar” is the best way to estimate quantitatively the bioturbation. Otherwise,when there are just little differences between the infilling and host rocks,“Color Range” is the best way. (3)Magic Wand Method has an advantage on the samples with large size trace fossils and good continuity as well as different color of infilled material. By modifying “Tolerance”,Magic Wand Method will increase the degree of recognition between the bioturbated area and host rock. This research makes a convincing explanation about heterogeneous and distribution of “matrix reservoir” of carbonate rocks in the perspective of biogenic,and has a great significance on fulfilling the characterization and interpretation of those bioturbation enhanced reservoir capacity in carbonate rocks,enriching geologic theory of carbonate reservoir,guiding the hydrocarbon exploration of the bioturbated reservoir,calculating reserves and selecting the best plan of the development of oil and gas fields.
Niu Yongbin,Cui Shengli,Hu Yazhou et al. Quantitative characterization of bioturbation based on digital image analysis of the Ordovician core from Tahe Oilfield of Tarim Basin[J]. JOPC, 2017, 19(2): 353-363.
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