Research on Oil-bearing Control Factors of the Chang 9 Tight Sandstone of Yanchang Formation in the Ordos Basin

doi:10.19657/j.geoscience.1000-8527.2018.01.18

Abstract

Abstract:

The oil-bearing control factors of the Chang 9 tight sandstone was studied in this paper based on the analysis of reservoir physical property, the core pictures and fluorescent image. The results are as followings: (1)The higher content of high plastic rock debris is, the worse sandstone physical property is, and the worse oil-bearing is;(2)The higher content of carbonate cement correlates negatively with oil-bearing; (3)The physical property correlates positively with the better oil-bearing; (4)Heterogeneity had a huge impact on oil-bearing led to petroleum partition in vertical and horizontal lines;(5)The lithology of sand bodies in underwater distributary channel mainly are gray mud gravel medium sandstone or middle-fine sandstone with good oil-bearing but that in interdistributary bay is dark grey mudstone, silty mudstone or argillaceous siltstone;(6)Fractures play a good role in improving the reservoir property. The simulated results also indicated the migration path of Chang 9 reservoir and the favorable exploration areas was selected that areas of Xinghe region to eastern Liandaowan, Xihekou-Ansai-Xiaping, Yanhekou-north of Fengzhuang.

Key words: the Ordos Basin, Chang 9 of Yanchang Formation, tight sandstone, oil-bearing, controlling factor

CLC Number:

TE122.2

WEN Fenggang, ZHU Yushuang, REN Zhanli, GAO Pengpeng, NI Jun, WANG Xianxian, XU Weiwu, MA Bin, GAO Mingxing, HONG Qianli. Research on Oil-bearing Control Factors of the Chang 9 Tight Sandstone of Yanchang Formation in the Ordos Basin[J]. Geoscience, 2018, 32(01): 183-190.

Figures/Tables 8

Fig.1 Position and regional structure map of the study area

Fig.2 Interlayer characteristics of dark laminae and core oiliness of the Chang 9 oil-bearing strata in the X well

Fig.3 The relation between different rock salt carbonate cement and areal porosity

Fig.4 The crossplot of porosity and permeability within different oil-bearing reservoirs the study area

Table 1 Comparison of porosity and permeability in different sedimentary facies

沉积相		孔隙度/%	渗透/10³ μm²
三角洲前缘	水下分流河道	11.21	2.21
	河口坝	8.3	1.03
	席状砂	8.77	0.25
	水下天然堤	5.8	0.10
	水下分流河道间	4.9	0.04
前三角洲		5.1	0.06

Fig.5 Core photos of the Chang 9 in the well Y

Fig.6 Corrosion occuring along the peripheral of crack, with improved the reservoir property, the well M,1 707.6 m

Fig.7 Porosity-permeability relationship of lower assemblage in the study area

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