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Santanghu Carboniferous basin geochemistry of source rocks

Author: LiuChunYan
Tutor: MaJinLong；WangXiaoFeng
School: Lanzhou University
Course: Paleontology and stratigraphy
Keywords: Source rocks Geochemistry Carboniferous Santanghu Basin
CLC: P618.13
Type: Master's thesis
Year: 2009
Downloads: 416
Quote: 8
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Abstract


Santanghu Basin is located in northeastern Xinjiang Uygur Autonomous Region, west Junggar Basin, south of the Turpan - Hami Basin, northeastern border with Mongolia, the overall basin in NW - SE trending, Santanghu tectonic evolution of the basin is composed of different during the prototype basin formed distribution superimposed smaller range of complex hydrocarbon basins. Papers in the collection and collation of relevant Santanghu Carboniferous basin on the basis of geological data, combined with results of previous studies on Santanghu Carboniferous source rocks in the basin of the organic geochemistry conducted a comprehensive analysis and research, and conducted a preliminary evaluation, while trying to investigate the structure - thermal event on the transformation of source rocks and the impact of scientific problems, the main understanding is as follows: During the study Carboniferous clastic sediment thickness basis, focusing on three areas Santanghu Palestinian Upper Carboniferous Tamar by Uchiyama group (C 2 b), Haerjiawu group (C 2 h), Kalagang (C 2 k ) were studied. That Haerjiawu group (C 2 h) is the Upper Carboniferous period mudstone deposited mainly, but also the main Upper Carboniferous source rocks. Among them, Haerjiawu mudstone mostly good - excellent source rocks, organic matter abundance also has a positive trend gradually with depth. Santanghu Basin Kalagang mudstone mainly Ⅱ 2 - Ⅲ partial Ⅱ 2 -type kerogen with minor Ⅰ, Ⅱ 1 kerogen. Haerjiawu mudstone mainly Ⅱ 2 , Ⅲ type kerogen, Bata Ma by Uchiyama mudstone mainly type Ⅲ kerogen. Three pond basin floor Carboniferous source rocks has entered a mature stage of early, mid, small sample reaches thermal evolution of oil generation - moisture phase. Bata Ma by Uchiyama mudstone thermal maturity than Kalagang and Haerjiawu groups. Santanghu Basin section mudstone samples are mainly poor - General hydrocarbon source rocks. Ginger Bath sets of source rocks better than Bata Ma by Uchiyama group Haerjiawu source rocks relative to the worst. Santanghu Carboniferous basin core organic geochemistry studies show that the Upper Carboniferous sedimentary environment for the freshwater environment, and presents the characteristics of water in different shades. Surface samples of organic geochemistry studies show that three Santanghu Yiwu, paper room, large sections 5 and Montenegro side five rock samples, and its organic form of the ancient environment of saltwater reducing environment, organic matter inputs to algae other low aquatic organisms and bacteria-based, core samples of the type of organic matter type Ⅱ ~ Ⅲ type, ie, containing sapropel of humic or humic and profile samples mainly sapropel. From a variety of biomarkers parameter displays the results of Carboniferous sedimentary environment sectional sample of ancient deep water salinization under reducing conditions; organic type of sapropelic (marine algae type Ⅱ ~ Ⅰ type), organic matter input algae and other aquatic organisms mainly bacteria and a small amount of terrigenous organic matter also has some contribution; overall evolution degree of organic matter is too mature. Since the late Hercynian tectonic movement tectonic - thermal event Carboniferous source rock maturation has played a positive role. Magmatism in the geothermal gradient increases, promoting Carboniferous source rocks in the area quickly reached a mature stage, is conducive to the formation of hydrocarbons. On the other hand, the volcano - magmatic activity brings a wealth of mantle material, the addition of these substances on the evolution of hydrocarbon generation played a significant catalytic effect, promoting the formation of hydrocarbons. By analyzing the different side of diabase rock hydrocarbon source rock samples from various geochemical characteristics found that the overall maturity of source rocks is high, while close to the rock 1m ~ 1.5m distance range, the organic matter maturity indicators have abnormally high levels of trend, indicating intrusions in direct contact with the source rocks baking effect is relatively small, about 1.5m or less.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Fuel deposits > Oil, natural gas
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