Analysis of physical characteristics and crude oil occurrence status of interlayered shale oil reservoir in Chang 7 Member in Southwest Ordos Basin

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  • 1.Northwest Institute of Eco?Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
    3.National Engineering Laboratory for Exploration and Development of Low Permeability Oil & Gas Fields,Xi’an 710018,China
    4.Exploration & Development Research Institute,PetroChina Changqing Oilfield Company,Xi’an 710018,China

Received date: 2023-04-26

  Revised date: 2023-08-21

  Online published: 2024-01-26

Abstract

At present, interlayer shale oil is the focus of shale oil exploration and development. How to quantitatively evaluate the occurrence and content of free and adsorbed hydrocarbons in shale oil reservoirs and the fluidity of hydrocarbons is the key to the exploration and development of Chang 7 shale oil. By means of nuclear magnetic resonance and constant velocity mercury injection, the reservoir properties, hydrocarbon occurrence and oil content of Chang 7 interbedded shale oil in the eastern region of Longdong were analyzed. The results of NMR experiments showed that the permeability of Chang 71, Chang 72 and Chang 73 sub-members was not much different, and they were all distributed in about 0.006×10-3 μm2. Among them, Chang 72 sub-member had the highest porosity and mobile fluid saturation, while Chang 73 sub-member had the lowest. In the constant velocity mercury injection experiment, the average pore radius size of the three sub-members of Chang 7 was not much different (130-150 μm), but the average throat radius size of Chang 73 sub-member (6-8 μm) was significantly better than that of the other two sub-members (less than 0.5 μm), and the pore throat characteristics of Chang 73 sub-member were better than those of the other two sub-members. In terms of the evaluation of free and adsorbed hydrocarbons, the free hydrocarbon content of Chang 71 sub-member is significantly higher than that of Chang 7 sub-member, and the Chang 71 sub-member has a large area of continuous distribution of sand bodies, so compared with Chang 72 sub-member, Chang 71 sub-member has more advantages in resource development. For Chang 73 sub-member, the total extraction amount and absolute free hydrocarbon content are the highest. If large contiguous sand bodies can be found, it will also have certain development significance.

Cite this article

Jiacheng LI, Yonghong WANG, Shengbin FENG, Weidong DAN, Junlin CHEN, Shan ZHANG, Youwei DUAN, Deyi CUI, Shutong LI . Analysis of physical characteristics and crude oil occurrence status of interlayered shale oil reservoir in Chang 7 Member in Southwest Ordos Basin[J]. Natural Gas Geoscience, 2024 , 35(2) : 217 -229 . DOI: 10.11764/j.issn.1672-1926.2023.08.011

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