Special Oil & Gas Reservoirs >

2023 , Vol. 30 >Issue 4: 10 - 18

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.04.002

Geologic Exploration

Heterogeneity of Chang 7 Shale Oil Reservoir and Its Oil Control Law in Ganquan Area, Ordos Basin

  • Zhong Hongli ,
  • Zhuo Zimin ,
  • Zhang Fengqi ,
  • Zhang Pei ,
  • Chen Lingling
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  • 1. Xi'an University of Science and Technology, Xi'an, Shaanxi 710054, China;
    2. Xi'an Shiyou University, Xi'an, Shaanxi 710065, China;
    3. Shaanxi Coal Geology Group Co., Ltd, Xi'an, Shaanxi 710021, China;
    4. Shaanxi Yanchang Petroleum (Group) Co., Ltd, Xi'an, Shaanxi 710075, China

Received date: 2022-11-09

  Revised date: 2023-05-06

  Online published: 2023-09-18

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Abstract

To reveal the macro heterogeneity of shale oil reservoirs in the Chang 7 oil reservoir formation, Ganquan area in the southeastern part of the Yishan Slope, Ordos Basin and its control on oil distribution, the macro heterogeneity of the Chang 71 and Chang 72 oil reservoir sub-formations was quantitatively characterized and compared by means of barrier bed and interbed identification statistics, permeability statistics and Lorenz curve construction, and the influence of macro heterogeneity on oil distribution was analyzed by the method of correlation analysis and multifactor overlay. The results of the study show that the average number of interbeds developed in the Chang 71 and Chang 72 shale oil reservoirs in the study area is 3.8 and 5.1 respectively, and the permeability of the sand body is dominated by composite rhyme and is strongly heterogeneous; the average number of barrier beds developed is 3.4 and 2.8 respectively, and the average thickness of single barrier bed is 6.0 and 4.9 m respectively; Chang 71 exhibits slightly weaker intra-layer heterogeneity and stronger inter-layer heterogeneity than Chang 72. The rhythmicity of the shale oil sandstone reservoir has obvious influence on the oil saturation, and the barrier bed with thickness greater than 10.0 m have obvious capping effect on oil and gas, while the "physical" barrier beds and interbeds constitute lateral shielding for oil and gas accumulation. The barrier bed is more developed in Chang 71 than Chang 72, and the oil and gas are more abundant in Chang 72. In the plane, the distribution of oil-gas accumulation area is strip-like, mostly located in the area with large sand thickness, good continuity and permeability of greater than 0.2 mD.The thickness of oil layer varies slightly in the direction of sand body extension along the river, but varies more in the direction of vertical river extension. The conclusion of the study can provide theoretical reference for the evaluation of the favorable area and the selection of development parameters for the Chang 7 sandwich type shale oil in the southeastern part of the Yishan slope of Ordos Basin.

Key words： reservoir heterogeneity; barrier bed and interbed; shale oil; Chang 7 oil reservoir formation; Ordos Basin

Cite this article

Zhong Hongli , Zhuo Zimin , Zhang Fengqi , Zhang Pei , Chen Lingling . Heterogeneity of Chang 7 Shale Oil Reservoir and Its Oil Control Law in Ganquan Area, Ordos Basin[J]. Special Oil & Gas Reservoirs, 2023 , 30(4) : 10 -18 . DOI: 10.3969/j.issn.1006-6535.2023.04.002

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