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- Title
Study on the porosity and permeability cutoffs of tight sandstones in shale stratum: Case study of Chang7 Member of the Triassic Yanchang Formation, Ordos Basin.
- Authors
Fu-tai JING; Xia LUO; Zhi YANG; Li-jun ZHANG; Shi-xiang LI; Yong CHEN; Yun-feng ZENG
- Abstract
The tight oil of Chang 7 Member of Triassic Yanchang Formation in Ordos Basin is the most significant and actual domain for the oil production. The porosity and permeability cutoffs of the three sub-members of Chang 7 Member determine the scale of its exploration and development potential. Using the empirical statistics method and the mercury intrusion parameter method to study the physical properties and test oil data of Chang 7 Member, it is found that the porosity and permeability cutoffs of the three sub-members of the Chang 7 Member is different, that is, the lower limit of the porosity and permeability is 7.0% and 0.053×10-3 μm2, respectively for the Chang 71 sub-member, 6.5% and 0.047×10-3 μm2, respectively for the Chang 72 sub-member, 5.5% and 0.042×10-3 μm2, respectively for the Chang 73 sub-member. Based on the grain size analysis, continuous thickness of sandstones and oil saturation of Chang 7 Member in the study area, the differences of porosity and permeability cutoffs were studied through the hydrocarbon accumulation mechanism. The results show that the porosity and permeability cutoffs of Chang 7 Member in the study area are mainly controlled by continuous thickness of sandstones and oil saturation. The formation mechanism of the Chang 73 sub-member is mainly “hydrocarbon accumulation” and “densification and reduction of pores”. Hydrocarbon strength and oil saturation play an important role in controlling the porosity and permeability cutoffs of tight reservoirs.
- Subjects
PERMEABILITY; POROSITY; SHALE; SANDSTONE; CASE studies
- Publication
Natural Gas Geoscience, 2020, Vol 31, Issue 6, p12
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2019.12.001