Abstract
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.
Highlights
The western area of Mahuangshan is located on the western edge of the Ordos Basin
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
2) Ningdong 5 well area small layer division contrast profile Combined with the river direction and the spread of the sand body, all wells in the Ningdong 5 well area are divided into five comparative profiles, the following is a comparative profile of the four small layers of Yan 81, Yan 82, Yan 91 and Yan 92 (Figures 9-13)
Summary
The western area of Mahuangshan is located on the western edge of the Ordos Basin. From the 1950s to the 1980s, Changqing and additional oil exploration departments successively carried out large-scale oil exploration in the area [1]. It is a set of coal and oil-bearing stratum combination dominated by river swamp facies. According to the lithology change, sedimentary cycle, oil-bearing property and coal seam development characteristics, the Yan’an formation is divided into four sections and 10 oil-bearing groups from bottom to top. They are the first section Yan 10 and Yan 9, the second section Yan 8, Yan 7 and Yan 6, the third section Yan 5 and Yan 4, and the fourth section Yan 3, Yan 2 and Yan 1 oil-bearing groups. Except for Majiatan, which is a Triassic basin, the rest are Jurassic basins [6]
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