Journal
MARINE AND PETROLEUM GEOLOGY
Volume 109, Issue -, Pages 484-493Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.marpetgeo.2019.06.038
Keywords
Pore structure; Fractal dimension; NMR T-2 spectrum; Mixed depositional reservoirs
Categories
Funding
- National Natural Science Foundation of China [41872133]
- China Postdoctoral Science Foundation [2019M650783]
- PetroChina Science and Technology Major Project [2016E-0108GF]
Ask authors/readers for more resources
The study on mixed depositional reservoirs is widely attended in recent years. However, the mixed depositional reservoirs are generally characterized by complex pore structure, which is caused by strong heterogeneity, complex mineral compositions, and varying pore sizes, presenting a major challenge to describe the difference in pore structure between different samples. To address this challenge, the pore structure of mixed depositional reservoirs was evaluated by the fractal dimensions, and the influences of various mineral compositions on pore structure were analyzed. The fractal dimensions derived from NMR measurements or NMR logging data can be divided into two segments at T-2cutoff values, representing different fractal values and characteristics of pore structure. For the E-3(2) Formation in Yingxi field, the fractal dimension of movable fluid pores ranges from 2.628 to 2.917 (average 2.765), whereas the bound fluid pore systems are not following the fractal theory. Meanwhile, the fractal dimensions show a negative relationship with movable fluid porosity and permeability. The effects of various mineral compositions on fractal laws of the pore networks are different. Fractal dimension increases with the increases of clay mineral contents, and the decrease of dolomite content, while the effect of calcite content on fractal laws of the pore system is uncertain, and quartz from different genetic type represents different effect on fractal dimensions. This study is contributed for petroleum exploitation in mixed depositional reservoirs and shows that the fractal dimension can comprehensively indicate the complexity of the pore structure in mixed depositional reservoirs.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available