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Study on Lower Cretaceous Sedimentary Facies in Beier Depression, Hailar Basin

Author: XuMeiE
Tutor: ZhouHongRui
School: Chinese Geology University (Beijing)
Course: Paleontology and stratigraphy
Keywords: Hailar Basin Beier Depression Sedimentary facies Fan delta Lower Cretaceous
CLC: P618.13
Type: Master's thesis
Year: 2005
Downloads: 314
Quote: 4
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Abstract


Hailar Basin, Songliao the peripheral Basin in the largest oil and gas basins, Beier Depression in Hailar Basin, a sub-tectonic units. Beier Sag in Hailar Basin in Central, to the north east, the form of relief, with an area of ??approximately 3000km2 East off West super graben depression. Northern the Bayantala fault as the boundary adjacent Wuerxun depression west onlap to consultations Kong uplift above is located in the territory of Mongolia, eastern, southern tectonic boundary. This paper studies the characteristics of the Beier Sag Lower Cretaceous sedimentary facies strata involved include the lower Cretaceous Zhalainuoer group, including the group of Tongbomiao Nantun Daruma Shui River Formation and Yimin. Using the core data, logging data and seismic data analysis methods in the study, the first 15 wells in the area of ??core observation description, the auxiliary core flakes observation analysis and rock granularity analysis to obtain a more reliable core sedimentary facies The analysis of the results, based on logging facies and seismic facies analysis. Of Beier Sag types of sedimentary facies distribution law, and then analyzes the the basin sedimentary facies distribution law and tectonic evolution process. Main types of sedimentary facies the Lower Cretaceous Zhalainuoer group of delta facies, lacustrine turbidite phase. The main types of micro-phase deposition of distributary channel, underwater distributary channel deposits, distal bar deposits, swamp and shunt Bay sand bar deposits, Lake argillaceous sediments. Copper bowl Temple group is characterized by a combination of coarse clastic rocks, mainly sedimentary facies of delta, fan delta plain channel deposits Nantun period of silt muddy sediments, the main sedimentary facies as delta-front facies; Nantun Group Sec Tai Shui River Formation grinding for some, is a deep lake - semi-deep lake depositional folder turbidite deposits, it is formed mainly in black, gray and black mudstone, muddy siltstone deposition, interposed with multilayer grit or with sandy conglomerate layer. From the evolution of sedimentary facies, look at the bottom of the Lower Cretaceous strata in coarse clastic up size thinner, reflecting its formation, the depositional environment changes, sedimentary basins gradually become darker. The basin sedimentary evolution of the process can be divided into four phases: the Tongbomiao group basin initial rift period, Nantun basin strongly faulted period, large Damoguaihe period of expansion for the basin deepening, Yimin off The Au period. The four stages of the basin experienced tectonic evolution of the Depression from the rift.

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