Li Fei1, Wang Fengqin1,2
1School of Earth Science and Engineering, Xi'an Shiyou University, Xi'an, China
2Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi’an Shiyou University, Xi'an, China
On the basis of core observation, logging interpretation and previous research results, the sedimentary microfacies characteristics of each sub layer of the Chang 2 oil-bearing formation in the Resiwan oil area of Zichang Oilfield and the superimposed relationship of sand bodies are studied. The results show that the Chang 2 member in the Resiwan oil area of Zichang oilfield belongs to braided river deposits, and the study area mainly develops sedimentary microfacies such as river island, channel lag deposits and floodplain. The vertical superimposition types of sand bodies in Chang 22 oil-bearing formation are multilayer superimposition sand bodies and massive thick sand bodies, which are also the dominant sand body combination of oil-bearing reservoirs in the study area. Chang 21 oil-bearing formation is dominated by thin interbeds. Flood plains are developed at the top of Chang 23 oil-bearing formation, and massive thick sandstone is developed at the middle and lower parts, but the horizontal continuity is poor. Horizontally, the sand bodies of Chang 22 oil-bearing formation are mainly overlapped horizontally and cut laterally, which improves the connectivity of the sand bodies to a certain extent. Chang 21 and Chang 22 are mostly isolated sand bodies, and the sand bodies are wrapped in mud, resulting in poor oil and gas display. The contact pattern of sand bodies in the study area is mainly affected by sedimentary microfacies and river water volume.
Resiwan; Chang 2; Braided river; Sandbody superimposition relationship
Li Fei, Wang Fengqin. Sedimentary characteristics of Chang 2 and its relationship with sand body superimposition in Resiwan oil region. Academic Journal of Environment & Earth Science (2023) Vol. 5 Issue 1: 15-20. https://doi.org/10.25236/AJEE.2023.050103.
 Chen Xinkai. (2019). Summarization and Discussion on the Four Engineering Patterns of Sandy Braided River Island Configuration. Special Oil and Gas Reservoirs, (02), 1-9.
 Yang Shaochun. (2015). Inner heterogeneity within braided bar of braided river reservoir and its influence on remaining oil distribution. Journal of Central South University (Natural Science Edition), (03), 1066- 1074.
 Sun Tianjian. (2014). A quantitative method for architectural characterization of sandy braided-river reservoirs, taking Hegli oilfield of Muglad Basin in Sudan as an example. Chinese Journal of Petroleum, (04), 715-724.
 Ge Yunlong. (1998). Geological model of braided river facies reservoir - "pan-connected body". Petroleum Exploration and Development, (05), 93-95+7-8 +15.
 Lu Zhiyuan. (2021). Characteristics and sand distribution of high-energy braided river deposits, a case study of X tight well area in eastern Sulige region. Chinese Journal of Petroleum, (08), 1003-1014.
 Li Weiqiang. (2018). Study on the Reservoir Architecture and Remaining Oil Distribution of Braided Channel. Journal of Southwest Petroleum University (Natural Science Edition), (04), 51-60.
 Suya Latu. (2020). Sandy Braided River Sandbody Configuration and Remaining Oil Distribution Pattern. Special Oil and Gas Reservoirs, (04), 10-18.
 Li Yilong. (2018). Reservoir architecture of braided river in Member 8 of Xiashihezi Formation, central-eastern Ordos Basin. Chinese Journal of Petroleum, (09), 1037-1050.
 Yin Ze. (2019). Study on Sedimentary Faciess Features of the Upper Triassic Yanchang Formation, in the Western Margin, Ordos Basin. Chinese Journal of Sedimentology, (01), 163-176.
 Jia Chengzao. (2020). Development challenges and future scientific and technological researches in China's petroleum industry upstream. Chinese Journal of Petroleum, (12), 1445-1464.
 Hui Xiao. (2019). The geological conditions, resource potential, and exploration direction of oil in Ordos Basin. Marine Oil and Gas Geology, (02), 14-22
 Song Jiaxuan. (2016). Oil-controlling factors analysis of Chang 2 reservoir of Bailangcheng and Resiwan Oilfield in Ordos Basin. Journal of Northwest University (Natural Science Edition), (02), 261-270.
 Shan Jingfu. (2015). Stacked rule and stage-time division for thick-layer, multi-period braided river sandbodies. Journal of Central South University (Natural Science Edition), (10), 3789-3800.
 Zhao Hui. (2020). Sedimentary Facies Characteristics and Sandbody Superposition of Yan'an Formation in Jing'an Area. Journal of Xi'an University of Science and Technology, (04),646-657.
 Zhu Rukai. (2021). Main exploration progress and future key fields of stratigraphic reservoirs. Lithologic Reservoirs, (01), 12-24.