In order to clarify the reservoir characteristics and main controlling factors of the flow three section of the K oil field in the Weixinan Depression, a study on the reservoir characteristics and main controlling factors of the flow three section of the K oil field in the Weixinan Depression has been carried out by utilizing the data of cores, casting thin sections, physical property tests and logging wells. The results show that the lithology of the reservoir in the flow three section of the study area is dominated by coarse sandstone and medium sandstone, followed by conglomerate-bearing sandstone and sand conglomerate. The porosity is mainly distributed in the range of medium-high porosity, and the permeability is mainly medium seepage, and the overall physical properties are good. The three sections of the stream in the study area mainly include four sedimentary microphases, namely, underwater diversion channel, estuarine dam, mat sand and inter-diversion bay. The underwater diversion channel has the best physical properties, characterized by coarse grains and low mud content. The medium and coarse sand content of various lithologic reservoirs is the main factor in the formation of high-quality reservoirs. Rock-forming action is an important factor affecting the physical properties of local reservoirs, comparing the compaction, cementation and dissolution between different sedimentary microphases, the underwater diverging river has the lowest rate of compaction and pore reduction, the highest rate of pore increase by dissolution, and the best physical properties. Therefore, the weakly cemented-strongly dissolved coarse sandstone phase developed in the microphase of the underwater diversion channel in section 3 of the flow in the study area is the most favorable reservoir.
References
[1]
Li, W. (2023) Reservoir Characterization of the Flow Three Sections of the Weixinan Depression in the Beibuwan Basin. Natural Gas Exploration and Development, 46, 42-49.
[2]
Man, X., Hu, D., Wu, J., et al. (2023) Developmental Characteristics and Reservoir Formation Mode of the Lake Bottom Fan in the Eocene Fluvial Section of the Weixinan Depression, Beibuwan Basin. Lithologic Reservoirs, 35, 137-144.
[3]
Lou, M., Yang, X., Yao, G., et al. (2020) Diagenetic Phase Analysis and Dessert Reservoir Prediction of the Flow Three Reservoirs in the Weixinan Depression. Marine Geology and Quaternary Geology, 40, 171-184.
[4]
Xu, Y., Yang, X. and Mei, L. (2020) Characteristics and Main Controlling Factors of the Sand and Gravel Reservoir in the Flow Three Section of the Northwest Steep Slope Zone of the Weixinan Depression. Earth Science, 45, 1706-1721.
[5]
Qiao, Y. (2017) Sedimentary Phase Spreading and Favorable Reservoir Prediction of the I-II Oil Group in the Flow Three Section of Wushi Depression, East District, Beibuwan Basin. Master’s Thesis, China University of Geosciences, Beijing.
[6]
Wu, S., You, L., Zhao, Z., et al. (2017) Reservoir Characteristics and Favorable Reservoir Distribution in the Flow Three Section of the Sloping Yang Slope Zone of the Weixinan Depression. Journal of Northeast Petroleum University, 41, 24-31, 122.
[7]
Peng, S., Li, S., Hu, D., et al. (2017) Early Oligocene Low-Level Deltaic Deposits and Hydrocarbon Geologic Significance of the Sloping Yang Slope of the Weixinan Depression, Beibuwan Gulf. Frontiers of Marine Geology, 33, 32-39.
[8]
Liu, J., Wang, R., You, L., et al. (2012) Compositional Petrography and Effective Reservoirs of the Liusha Harbor in the Weixinan Depression. Journal of Southwest Petroleum University (Natural Science Edition), 34, 175-184.
[9]
Gong, L., Hu, D., Man, X., et al. (2022) Sedimentary Characteristics of Early Lake-Bottom Fan and Prediction of Favorable Reservoirs in the High Level Domain of the Flow Section of the Weixinan Depression. China Offshore Oil and Gas, 34, 54-64.
[10]
Sun, X., Fang, X., Chen, K., et al. (2019) Sedimentary Microphase Study of the Fan Delta in the Context of Complex Fault Blocks and Lithology—A Case Study of the Weizhou A Oilfield. China Science and Technology Information, No. 6, 97-98.
[11]
Sun, L., Yu, X., Li, S., et al. (2017) Sedimentary Characteristics of the Water-Entrained Fan Delta of the Eocene Liusan Section in the Eastern Part of the Wushi Depression, Beibuwan Basin. China Geology, 44, 485-498.
[12]
Liu, X. (2021) Sedimentary Phases and Reservoir Characteristics of Shasi Section in Niuxintuo Area, LiaoXi Depression. Master’s Thesis, China University of Petroleum, Beijing.
[13]
Ma, X., Yin, T. and Wang, X. (2009) Sedimentary Microphase Study of the Fan-Delta Front of the Qiketai Formation in Le3 Block. Xinjiang Oil and Gas, 5, 10-14, 27.
[14]
Li, M., Dong, G. and Qi, Z. (2015) Sedimentary Phases of the Weizhou 10-3 Oil Field in the Weixinan Depression and the Flow Three Sections in the Surrounding Area. Journal of Sedimentology, 33, 314-325.
[15]
Zhang, B. (2021) Sedimentation and Diagenesis in a Faulted Basin under Volcanic Influence. Master’s Thesis, China University of Mining and Technology, Xuzhou.
[16]
Gao, L., Zhang, M., Yan, H., et al. (2017) Reservoir Characteristics and Controlling Factors of the Weizhou 10-A Oilfield and the Flow Three Section of the Surrounding Area in the Weixinan Depression. China Mining Industry, 26, 156-163, 168.
[17]
Jiang, P. (2014) Comprehensive Evaluation of Complex Reservoirs in Liushagang Formation, Weixinan Depression. Ph.D. Thesis, China University of Geosciences, Wuhan.
[18]
Cao, Y. (2019) Main Controlling Factors of High-Quality Reservoirs in Dongying Formation of CFD6-4 Oilfield in Bozhong Depression. Master’s Thesis, China University of Petroleum (East China), Qingdao.
[19]
Beard, D.C. and Weyl, P.K. (1973) Influence of Texture on Porosity and Permeability of Unconsolidated Sand. AAPG Bulletin, 57, 349-369. https://doi.org/10.1306/819A4272-16C5-11D7-8645000102C1865D
[20]
Wang, J., Cao, Y., Liu, K., et al. (2017) Identification of Sedimentary-Diagenetic Facies and Reservoir Porosity and Permeability Prediction: An Example from the Eocene Beach-Barsandstone in the Dongying Depression, China. Marine and Petroleum Geology, 82, 69-84. https://doi.org/10.1016/j.marpetgeo.2017.02.004
