Journal
PETROLEUM EXPLORATION AND DEVELOPMENT
Volume 42, Issue 3, Pages 434-438Publisher
KEAI PUBLISHING LTD
DOI: 10.1016/S1876-3804(15)30036-7
Keywords
tight oil; oil occurrence space; nuclear magnetic resonance experiment; high speed centrifugation experiment; low-temperature adsorption experiment; Ordos Basin; Triassic Yanchang Formation
Funding
- National Science and Technology Major Project [2011ZX05013-006]
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Low-temperature adsorption experiment, high-speed centrifugal gas displacing water experiment and nuclear magnetic resonance (NMR) experiment were conducted on sealed coring samples taken from Triassic Yanchang Formation Chang 7 tight oil reservoir of Northern Shaanxi Area, Odos Basin, to analyze the tight oil occurrence space quantitatively. Micro-capillary bound water T-2 (transversal relaxation time) spectra after 2.76 MPa centrifugation and distribution of micro-pores less than 50 nm obtained from low-temperature adsorption experiment both reflect less than 50 nm pore throats consistently, and conversion coefficient C of T-2 and pore radius can be computed from comparing their distribution. The conversion coefficient of 15 cores in the study area is 5.80 nm/ms on average. Using C in oil phase T2 spectrum of sealed coring samples, the maximum pore radius of oil occurrence in the study area is 363-8 587 nm, 3 195 nm on average, and average pore radius of oil occurrence 50-316 nm, 166 nm on average, and main pore radius of oil occurrence is 97-535 nm, 288 nm on average. Tight oil mainly exists in nanometer pores.
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