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Research on the Origin of Oil and Gas in Nanbeier and Tanan Depressions of Tamuchage Basin

Author: GaoJunHong
Tutor: ShenJiaNian
School: Northeast University of Petroleum
Course: Geochemistry
Keywords: BellSouth depression Tanane depression Hydrocarbon source rock evaluation Geochemical Characteristics of Crude Oil-source correlation
CLC: P618.13
Type: Master's thesis
Year: 2011
Downloads: 54
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Abstract


The BellSouth, depression Tanane is the Basin Tamsag the two tectonic units located in eastern Mongolia, Tamsag Basin, extends north into the territory of Hailar Basin and China belong to the same tectonic units. Bellsouth, Tanane depression Beier depression extends clarify BellSouth sources of oil and gas Tanane depression have certain guiding significance not only exploration and development in the area, but also for perfect theory Tamsag Basin understanding a certain significance. Study of the BellSouth, Tanane hydrocarbon source rocks integrated Fufen method, the results show that the the Nantun oriented source strata, especially the special lithologic South on the source rocks for the best source rock bits, followed by the South Sec medium source rocks can be used as a secondary source rock group of Tongbomiao, composite cycles paragraph and Damoguaihe mudstone poor source rock or non-hydrocarbon source rocks. To combine the Basin Tamsag the geological background, experimental analysis based on the characteristics of the physical properties of crude oil, the group composition of n-alkane carbon isotope characteristics of saturated hydrocarbons and isoprene hydrocarbon characteristics of crude oil on the area hydrocarbon source rock formation environment, parent material source, maturity and biomarker combination features and by type of crude oil. BellSouth crude type I is mainly distributed in the various layers of the BellSouth East times concave North subsags in bit, the BellSouth type II crude oil mainly distributed in the BellSouth East sub-concave the South subsags the composite cycle segment, BellSouth type III crude oil mainly distributed in BellSouth East sub-sag the South subsags the southern section. Tanane crude type I mainly distributed in the Tanan East sub-concave composite cycle segment, Tanane type II crude oil distribution in Tanan times concave layers (except the tower 19-46 wells near) bit and East sub-sag special lithologic South Sec, Tanane type III crude oil are mainly distributed in the northern Tanane in times concave tower 19-46 wells nearby. By gas chromatography parameters, various biomarkers and carbon isotope parameters comparison between crude oil and source rock, the main source of the crude oil Nantun mudstone dark mudstone. Dark mudstone the Bellsouth crude type I from special concave North, the BellSouth East sub subsags lithologic. The BellSouth type II crude oil mainly from special lithology mudstone of the region and parts of the south and mudstone. The BellSouth type III crude oil mainly from the south and one in the previous paragraph, and part of the maturity of the South Section mudstone from special lithology mudstone. The type Ⅰ Tanan crude oil from the region's special lithologic mudstone. The type Ⅱ crude oil mainly from Tanane special lithologic some mature mudstone of the south and one in the upper section of the South, Sec. The Tanan mainly from crude type III in the special lithologic part of the south and mudstone.

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