To supplement, adjust and improve the division plan of crude oil strata in the west of Mahuangshan Mountain. Combining well logging, core, and drilling analysis and testing data, Petrel software was utilized to classify and compare the 10 layers of the Yan’an Formation. Draw 6 “net-like” skeleton profiles for Ningdong No. 2 and No. 3 wells, involving 31 wells. On the basis of the large-layer strata division, Yan 8 and Yan 9 sections are divided and compared; five “net-like” skeleton profiles were drawn in the 5 well, involving 16 wells. On the basis of the large-layer division, the small-layer division and comparison were performed by Yan 8 and Yan 9. The results show that the Yan 8 oil layer is divided into two stratigraphic units, and Yan 8 and Yan 82, and the Yan 9 oil layer is divided into two stratigraphic units, Yan 91 and Yan 92; the Yan 2 layer in the 2 and 3 well blocks of Ningdong is in the marker layer. The top of the coal seam, Yan 8 layers in the Ningdong 5 well area is on the top of the auxiliary marker seam. The fine division of small layers into tiny layers of sedimentary microfacies, reservoir heterogeneity, development dynamic analysis, remaining oil distribution and other studies provide indispensable data.
References
[1]
Hao, Y. (2008) Sequence Stratigraphy and Reservoir Sand Body Characteristics of Middle Jurassic Yan’an Formation in Mahuang Shanxi Area, Ordos Basin. Chengdu University of Technology, Chengdu.
[2]
Yan, J.P. and Lv, Y.J. (2009) Analysis of Fault Structure Characteristics and Hydrocarbon Accumulation in Mahuang Shanxi Area. Petroleum Geology and Engineering, 23, 15-17.
[3]
Li, W.S., Ma, G.S., Wei, D., Mao, J.W. and Yang, Y. (2011) Sedimentary Facies Analysis of Yan 8 - 10 Layers of Yan’an Formation in Mahuang Shanxi Area, Ordos Basin. Shaanxi Geology, 29, 47-55.
[4]
Tao, Y. (2009) Reservoir Characteristics and Evaluation of Yan’an Formation in the Northeast of Mahuang Shanxi Block. Chengdu University of Technology, Chengdu.
[5]
Chen, Z.Y. (2010) 3D Reservoir Modeling of Jurassic Yan 8 Formation in Ningdong 2 and 3 Well Blocks of Mahuang Shanxi block, Ordos Basin. Journal of Paleogeography, 12, 346-354.
[6]
Wen, L., Leng, G.F. and Sun, H.T. (2010) Technical Method of Sub Layer Division and Correlation. Inner Mongolia Petrochemical Industry, 36, 104-105.
[7]
Yang, L. (2008) Restoration of Jurassic Yan’an Primitive Basin in Ordos Basin. Northwest University, Xi’an.
[8]
Huang, J. (2008) Study on Management Countermeasures of High-Yield Wells in Fractured Vuggy Reservoirs. China University of Petroleum, Beijing.
[9]
Jia, B. (2015) Study on Reservoir Characteristics and Oil and Gas Enrichment Law of Chang 4 + 5 Oil Formation in Yougou Oil Area of Wuqi Oilfield. Chang’an University, Xi’an.
[10]
Liu, B.Y. (2017) Study on Enrichment Law of Yan 9 Reservoir in Jiyuan Oilfield. Xi’an University of Petroleum, Xi’an.
[11]
Zhang, Y.F. (2013) Study on Geological Conditions and Reservoir Forming System of CO Enrichment of Multiple Energy Minerals in Ordos Basin. China University of Geosciences, Beijing.
[12]
Hou, S.W. (2009) Yan 8, Mahuang Mountain, Ordos Basin. Comparative Study on Fine Division of Oil Reservoir Groups. Inner Mongolia Petrochemical Industry, 35, 122-124.
