Dissertation > Excellent graduate degree dissertation topics show

A Structural Study of the Northern Part of Bayanhaote Basin,Inner Mongolia

Author: YangChao
Tutor: LiuShun
School: Chengdu University of Technology
Course: Structural Geology
Keywords: Bayanhaote Basin Tectonic Style Structural Trap
CLC: P548
Type: Master's thesis
Year: 2013
Downloads: 13
Quote: 0
Read: Download Dissertation

Abstract


The study area of this thesis is located at the northern part of Inner Mongolia Bayanhaote basin, constructed in Alashan, Ordos block and Qilian fold belt interchange. Although the oil and gas of this area is rich, the research of tectonic framework and evolution of the area are still lacking and restricting the exploration and development of oil and gas. Therefore, systematically analyzing the development of the northern part of the basin evolution of the area, from geometry, kinematics point, is particularly important.Firstly, the2D seismic data of drilling, seismic, regional document is interpreted with Discovery2004and four layer calibrations, Carboniferous bottom, Jurassic bottom, Cretaceous bottom and Paleogene bottom, are been marked referenced on Changqing Research. Then found the geometric characteristics of the study area: eastern fault zone, western depression zones. On this basis, from north to south the area is divided into two secondary tectonic units:Tonggulou bulge and Xiling depression. And they can be divided into the lower structural layer and the upper structural layer separated by Paleogene bottom. The lower structural layer includes Paleozoic-Mesozoic strata, developmental closed folds and gently fold normal fault system and reverse fault system. The upper structural layer includes mainly consist of Cenozoic strata, including development of the gentle folds, normal faults and few reverse faults.Secondly, profile interpretation on kinematic characteristics and evolution of the study area show that there was a horizontal compression in the late Cretaceous period and construct some closed folds and gently fold and a lot of NE-SW trending normal faults and reverse faults. Some of the faults in the lower structural layer are synsedimentary faults. Some of them are receiving the deposition side off the wrong move but stop in the Cretaceous Period, and some of them active again by the regional campaign at the end of the Cretaceous Period or in the Cenozoic Era Period, and the rest of them construct reverse faults by extrusion at the end of the Cretaceous Period and few still stay active. The upper structural layer experienced two campaigns: extensional activities of the Paleogene period or the Neogene period and compressional thrust movement of the end of the Neogene period and constructs gentle fold. The study show that a lot of faults of the upper structural layer are faults of the lower structural layer with one or two times of activities. Few faults has diastrophism only in the Neogene period.From the interpretation of sections we can see that the difference is significant:the activities of Tonggulou bulge is more strong than Xiling depression. As a result, activities of the area is weaker from south to north. There are also a lot of tectonic styles in the area. The tectonic style of region or the basement of the basin not only control the Sedimentary model and grown mechanism of the basin but also the type and distribution of the Oil and gas traps of the basin. With detailed analyzing of the interpretation of seismic profiles, we can find two main type of structure style:the extensional structures style and the extrusion tectonic style. Examples of the former are Graben-horst, Half-grabens, Step fault combination and tilted fault blocks. And examples of the extrusion tectonic style are Imbricated thrust fault combination and back thrust combination. Almost all the two types are developed in the lower structure layer.Finally, by using the analysis on the regional geological data, we can analyze the history of the study area. Before lower Ordovician, the area is Helan aulacogen. Being in transgression, deposition and regional activities extrusion, it gets erosion. There misses Ordovician and Devonian. In Carboniferous Period, the area is squeezed by the north-south in the Qilian movement and constructs some north-south or NE-SW direction extension fractures. A large area of the area uplift. There misses Permian system and Triassic system. In the Jurassic period, there are magmatic activity and parts of it has dome collapse. Near the end of the Jurassic period, the fold of Helan Mountain uplift, and produces some ladder normal faults. At end of the Cretaceous period, the region is squeezed again by the Yanshan movement, produces folds and reverse faults and unconformity contact with the overlying strata angle. After this, the area has been in a stable settlement, also develops a number of normal faults. To the end of the Neogene period, the study area is slightly squeezed by the Himalayan movement and produces some gentle folds. After that the area is stable.It is publicly accepted that basin tectonic style and type of hydrocarbon traps are closely linked. The main style of the study area are compressional tectonic style and extensional tectonic style. The area forms two corresponding types of traps:4faulted anticline and4fault block traps, which are commonly exist and developed in the study area. Faulted anticline is anticline which is closed and breaked by multiple faults and located between two faults. It consist the thrust tectonic wedge and the faulted anticline is split into few fault blocks. The key of fault trap to gather oil and gas is closure. When the fault is closed, the fault trap is a good hydrocarbon trap. According to this interpretation the area in Carboniferous period has well developed structural traps and good preservation, especially Jingyuan group and Yanghugou group, and it is good for Carboniferous accumulation. So the layer in Carboniferous system is used for exploration. Further more, with layers in Jurassic period and Cretaceous period covering on the layer of Carboniferous period, it is another profit condition. After the end of the Cretaceous period, the study area get stable, get little influence from regional tectonic movement, has low active fault developing and less structural traps damage, all these let it to be more fit to storage oil.All the traps of the study area are located in the lower structural layer of Tonggulou bulge and formed in the late Cretaceous period. the couniugou Formation of Lower Carboniferous begins mature from the beginning of the Tertiary period and Benxi Formation of Middle Carboniferous begins mature from the end of the Tertiary period. This means that the trap constructs significantly earlier than the maturity of organic matter and so all the traps are likely to accumulation.

Related Dissertations

  1. Research on the Fault Tectonic Style and Main Fault Sealing of Western Huimin Depression,P542.3
  2. Study on Lower Paleogene Sequence Stratigraphy in Chaluhe Fault Depression of Yitong Fault Trough and Non-structural Trap Prediction,P539.2
  3. Western Tahe Oilfield Fracture Characteristics and the Relationship of Oil and Gas Research,P618.13
  4. Buried Reservoir of Dacheng Area and Its Insider Exploration Targets and Implement Accumulation Evaluation,P618.13
  5. The Tectonic Feature and Its Petroleum Exploration Meaning in the Western Part of the Northern Junggar Basin,P618.13
  6. The Research on Fault System in Longmen Shan Foreland Basin,P618.13
  7. Study for Offshore Break and Non-structural Trap Formation in Depression Basin,P618.13
  8. The Research on Fault Control of Hydrocarbon Accumulation and Preservation in the Thrust Belt of Southern Junggar Foreland Basin,P618.13
  9. Structural Features and Oil-gas Distribution of Main Abundant Hydrocarbons Depressions in Subei Basin,P618.13
  10. Sedimentary Characteristics and Tectonic Significance of the Silurian Mayilashan Formation of Kuokehada Area, Western Junggar,P548
  11. The Active Evaluation and Area Stress Field Analysis Based on the North Rim of Western Qingling-Baoji to Tianshui Section,P548
  12. The Characteristics of Magnetic and Gravity Field and the Structural Division of Regional Geologic Structure in Xizang Autonomous Region,P548
  13. The Tectonic Features and the Engineering Adaptability Evaluation of Jiacha Regions in Tibet,P548
  14. Study on the Fault Activity of Northern Segment Longmenshan and Its Control Effect on the River System Process,P548
  15. Xixia Basin, Late Cretaceous sedimentary and tectonic environment analysis,P548
  16. Sedimentary Characteristics and Significance of Kaixinling Group in Western Qamdo Block, XiZang,P548
  17. Structrural Character Research in the Northern Sichuan Basin,P548
  18. Application Research on DTM Data and ETM+images in the "Mineral Prospective Survey of Xunyang-Baihe Area",P548
  19. Study of the Aergashun Ductil Shear Zone in Tamusu Region of Aixa Youqi, Inner Mongolia,P548
  20. Division and Correlation of Tectonic Units in the Adjacent Region of China Northeast and Far East of Russian,P548
  21. QUANTITATIVE ASSESSMENT AND ZONATION OF REGIONAL CRUSTAL STABILITY IN NORTHWEST YUNNAN,P548

CLC: > Astronomy,Earth Sciences > Geology > Structural Geology > Regional structural geology
© 2012 www.DissertationTopic.Net  Mobile