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Two-parameter prestack seismic inversion of porosity and pore-structure parameter of fractured carbonate reservoirs; Part 2, Applications

Tingting Zhang, Zhang Ruifeng, Tian Jianzhang, Lu Lifei, Qin Fengqi, Zhao Xianzeng and Yuefeng Sun
Two-parameter prestack seismic inversion of porosity and pore-structure parameter of fractured carbonate reservoirs; Part 2, Applications
Interpretation (Tulsa) (November 2018) 6 (4): SM9-SM17

Abstract

Fractures and fracture-related dissolution pores, as well as cavities, molds, and vugs, provide the major conduit and/or storage space for hydrocarbons in the deeply buried carbonate hill of Hexiwu field, Bohai Bay Basin. The fractured reservoir generally has lower porosity but better permeability than moldic/vuggy reservoir, and it consists of the major part of the buried-hill slope and buried-hill internal reservoirs. The conventional method of characterizing carbonate reservoirs, however, often mixes these two types of reservoirs together because they both have low acoustic impedance and low bulk modulus. The rock-physics analysis of two field wells indicates that a pore-structure parameter defined in a rock-physics model, the so-called Sun model, can help to distinguish the fractured reservoir zones together with porosity. Fractured zones usually have porosity of less than 5% and a pore-structure parameter of greater than six, whereas moldic/vuggy reservoirs of higher porosity have a pore-structure parameter of less than six. Field-scale application demonstrates that simultaneous prestack seismic inversion for the porosity and pore-structure parameter enables 3D mapping of fractured reservoir zones in the buried carbonate hills. It also provides an analog of detecting fractures and/or fracture-related pores in deeply buried carbonates in similar geologic settings.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 6
Serial Issue: 4
Title: Two-parameter prestack seismic inversion of porosity and pore-structure parameter of fractured carbonate reservoirs; Part 2, Applications
Affiliation: BP America, Houston, TX, United States
Pages: SM9-SM17
Published: 201811
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 18
Accession Number: 2019-007373
Categories: Applied geophysicsEconomic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Special section; Foothills exploration
Illustration Description: illus. incl. sketch map
N38°00'00" - N40°00'00", E117°00'00" - E119°00'00"
Secondary Affiliation: Huabei Oilfield Company, CHN, ChinaTexas A&M University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 2019
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