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- Title
Reservoir characteristics and enrichment rule of highly sandy formation in Melut Basin, Central Africa.
- Authors
Shi Zhong-sheng; Wang Tian-qi; Xue Luo; He We-wei; Bai Jie; Han Qian-feng
- Abstract
Melut Basin has abundant petroleum resources as a Central Africa passive rift basin and developed two typically highly sandy formations.The regional highly sandy formation,which is made up of regional thick sandstone of Yabus and Samma Formations and regional mudstone of Adar Formation of Paleogene,is the key reservoir-caprock assemblage and formed all kinds of antithetic faulted blocks and faulted-nose structural reservoirs.By contrast,the local highly sandy formation of Galhak Formation of Upper Cretaceous,which is close to source rock and interbedded by sandstone and mudstone,is a new reservoir-caprock assemblage and exploration target layer for seeking structure-lithology and lithology-stratigraphy reservoirs in the mid-late stage of basin exploration.By deeply studying the oil reservoir character,enrichment rule,reservoir evaluation and exploration method of the highly sandy formation of Galhak Formation,the research firstly revealed that the flooding mudstone controlled the oil reservoir formation,and the distributary channel sandstones of inner braided delta front controlled HC enrichment.That is,the flooding mudstone is the key controlling factor on hydrocarbon pool formation, the high-porosity and thick sandstone is the reservoir condition and the inner braided delta front is the favorable sedimentary facies zone for developing high production layers of Galhak Formation. Moreover, the paper proved that the fine division and evaluation based on the identification and correlation of flooding mudstones can improve the study scale and evaluation accuracy for highly sandy formation. And the integrated approach of judging oil & water layers based on well logging, mud logging and reservoir geological conditions can more accurately understand oil-water contact and reservoir characteristics for the complicated faulted block reservoirs of thick and highly sandy formations. The study upgraded the exploration potential of highly sandy formations interbedded by sandstone and mudstone, and expanded exploration space of Melut Basin, and will have an important impact on highly sandy formations exploration in the similar passive rift basins in Central and Western Africa.
- Subjects
CENTRAL Africa; PETROLEUM reservoirs; PETROLEUM prospecting
- Publication
Natural Gas Geoscience, 2017, Vol 28, Issue 2, p1
- ISSN
1672-1926
- Publication type
Abstract
- DOI
10.11764/j.issn.1672-1926.2016.12.008