柴西緣干柴溝地區(qū)古近系下干柴溝組物源分析與沉積特征
[Abstract]:The Lower Ganchaigou formation of Paleogene in Qaidam Basin is the main oil-producing zone in the western oil field, which contains great potential for oil and gas exploration and development. It is of great significance to study the spatial distribution of sand bodies by studying its material source and distribution of sedimentary facies in detail. In this paper, based on the previous research results, combining the field typical outcrop observation, profile measurement, indoor sample analysis, testing and logging curve characteristics, taking statistical data, drawing contrast analysis and other research methods as the research methods, The sedimentary characteristics and provenance characteristics of Xiaganchaigou formation in western Qaixi area were studied, and the source direction, source tectonic setting and parent rock properties of the Lower Ganchaigou formation in Ganchaigou area were determined. The types of sedimentary facies and the distribution of sedimentary facies in the Xiaganchaigou formation are revealed from the macroscopic point of view, which provides the basis for the study on the distribution of sand bodies of the Lower Ganchaigou formation in the western Qaixi area. The Xiaganchaigou formation in the study area is mainly composed of a set of clastic deposits. The sandstones are mainly feldspathic sandstone, lithic feldspathic sandstone and lithic sandstone. The content of rock debris in sandstone is high, ranging from 23 to 57. The grinding roundness of clastic grain is mainly angle-sub-angle-shaped, and the separation is poor, with the characteristics of low compositional maturity and low structural maturity. The provenance analysis shows that the Ganchaigou formation in the Ganchaigou section is derived from the Solkuri direction of the western section of the Altun, and the clastic lithoclasts are mainly from the Proterozoic, Ordovician metamorphic rocks, which are exposed from the middle of the Altun Mountains. The tectonic environment of the provenance area is transitional multi-island oceanic environment, and the source rocks are diversified, mainly from granites in the upper crust, feldspathic volcanic rocks and a small amount of basic rocks, and the sedimentary environment is a weak oxidation-weak reductive environment. It is favorable for the enrichment and preservation of organic matter. The petrological characteristics, sedimentary structures and typical well logging curves of the Lower Ganchaigou formation indicate that the Lower Ganchaigou formation is mainly characterized by alluvial fan facies, fan delta facies and lacustrine equivalent sedimentary facies. The Ganchaigou formation in the Ganchaigou section is a retrogressive fan delta facies formed under the background of lacustrine transgression. The analysis of sedimentary facies (sedimentary microfacies) shows that the sedimentary pattern of the study area was surrounded by alluvial fans in front of Aljin Mountain and Qimantag Mountains and gradually transitioned into inland lacustrine facies during the sedimentary period of Lower Ganchaigou formation. On this basis, the alluvial fan-fan delta-lake sedimentary model was established.
【學(xué)位授予單位】:長安大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:P618.13
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