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Structural Evolution and Relationship with the Oil and Gas of Hechi-Yishan Fault Zone in North of Guangxi Zhuang Autonomous Region

Author: HouYuGuang
Tutor: WangXinWen
School: Chinese Geology University (Beijing)
Course: Structural Geology
Keywords: Hechi - Yishan fault zone Structural styles Balanced section Fault zone evolution Oil and gas exploration
CLC: P618.13
Type: Master's thesis
Year: 2005
Downloads: 196
Quote: 0
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Abstract


Papers in the field first-hand information on the basis of by drawing tectonic profile interpret seismic profiles produce balanced cross section deformation field and stress field analysis and other technical means, Hechi - Yishan fault zone structure, geometry, sports The school and the formation and evolution of its relations with the oil and gas, a more systematic study. Made the following understanding: Hechi - Yishan fault zone cloth in northern Gui Depression, the overall trend NW-EW-trending, composed of a series of thrust faults, the main fault generally two major fault with the secondary fault and fold structures constitute accompanied wide 5-20km ranging from fault-fold belt; the main fracture tendency N or S; along the strike can be divided into of Hechi, Yishan, liucheng, Yingshan four tectonic segments; fault segment structure, associated structures fold combination of styles, rock deformation and structural features there are some differences. 2. Fault zone in the geophysical field and seismic profiles were significantly display; and control the development of sedimentary facies distribution, performance shallow water carbonate formation the rifting basin upthrown side development for the north side of the fracture downthrown salt terraces or isolated carbonate platform, fault zones constitute the structure of the two - the ancient geographical boundaries. 3. Fault zone structural styles compressional tectonic extensional tectonic inversion structures and strike-slip four major categories. Segment of Hechi back thrust structure and off the floor - ramp thrust - nappe structure Yishan segment mainly southward imbrication liucheng segment red north imbrication British Hill section positive flower or imbrication. 4. Fault zone kinematics and balanced cross-section analysis reveals: four sections deformed strata deformation shortening 8.54Km, 17.5km, 11.4km-13 km, 2.3km deformation shortening rate of 19.1%, 34.3%, 24.8 % -21.8%, 7.9%; intermediate fault zone deformation intensity gradually weakened to both sides. 5 tectonic deformation of the fault zone controlled by regional tectonic stress field and deformation field. The Caledonian movement for nearly SN squeeze folding fault zone may form a weak structure with; Indosinian movement for nearly SN squeeze folding early syngenetic normal fault tectonic inversion to form something to fault-fold belt; early Yanshanian movement squeeze folding of the NW-SE trending fault zone toward start bending deformation; the late Yanshanian movement NNE-SSW direction of extrusion folding, is the fault zone basic stereotypes period; early Himalayan movement for nearly EW compression; Himalayan late movement for regional uplift. 6 of the tectonic evolution of the fault zone can be divided into the Caledonian zone with the initial formation period, Hercynian - Early Indosinian fault zone rifting phase, late Indo-China - Himalayan tectonic inversion - compressional deformation stage. 7. Fault zone tectonic evolution of control Settlement of northern Gui Depression Basin, buried - denudation history and thermal history - source rock maturation history; tectonic deformation control style of structural traps and reservoir formation, distribution, destruction and saved.

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