Author(s)

Zhiwei Du^1,2, Zhaoyong Ping^1,2, Feng Chen^1,2

¹School of Earth Science and Engineering, Xi’an Shiyou University, Xi’an, China.
²Key Laboratory of Hydrocarbon Accumulation of Shaanxi Province, Xi’an Shiyou University, Xi’an, China.

In this paper, the Chang 2 reservoir in Zichang Area of Ordos Basin, the second largest sedimentary basin in China, is classified and evaluated by using logging and core data, thin section identification and electron microscopy. The main sedimentary microfacies of Chang 2₁³ is braided river delta sedimentary system in geological history, and there are three main sedimentary microfacies types: swamp microfacies, distributary channel microfacies and natural embankment microfacies on land. The heterogeneity in the study area is as follows: Chang 2₁² formation has the strongest heterogeneity, followed by Chang 2₁¹ formation with strong heterogeneity, and finally Chang 2₁³ formation with medium heterogeneity. The reservoirs of Chang 2 member in the study area are dominated by III_a, II_b and III_b, and the reservoirs are mainly composed of ultra-low porosity and low permeability reservoirs and low porosity and low permeability reservoirs.

Zichang Area, Sedimentary Microfacies, Reservoir Assessment, Ordos Basin

Du, Z. , Ping, Z. and Chen, F. (2024) Evaluation of Chang 2 Reservoir in Zichang Area, Ordos Basin. Journal of Geoscience and Environment Protection, 12, 1-11. doi: 10.4236/gep.2024.124001.