【地理】向歪与背歪(国外英文资料).docVIP

【地理】向斜与背斜(国外英文资料) fold The intense collision and horizontal extrusion caused the sedimentary rocks to bend to form a fold, often forming the large fold mountains. There are two basic forms of the fold, the downward sloping downward sloping, and the upward sloping in the middle is called the anticline. Anticline (anticline) One of the basic forms of folding in the pleated structure is relative to the syncline. The anticlinal appearance is usually the bending of upward. The anticlinal slope is tilted outwards from the center, the core part is the old rock formation, and the two wings are the new rock formations (which is the fundamental difference between them and the syncline). Topographic features: the top of the anticline is affected by tension, the lithology is fragile, easily eroded, and the ground is formed by the external force. Contrary to the anticlinal position, the bottom rock is hard to corrode and readily accepts deposit. The anticlinal force of the anticlinal force is formed by the force of the force, and it becomes a mountain under the force of the force, which is referred to as inversion of the terrain, which is a typical manifestation of the role of external forces. Engineering application: Anticline is often a good reservoir and gas structure. The anticline is suitable for building a tunnel. Coal, oil, etc. Are formed by the geological evolution of tens of thousands of years, and are closely related to the new old age of rock formation. Some of the sedimentary rocks that contain oil and gas have been deformed by huge pressure, and the oil has gone to the anticlinal, forming a rich zone. So the anticlinal structure is often the warehouse of oil storage, called reservoir construction in petroleum geology. Usually, because of the lowest density of natural gas, at the top of the anticlinal structure, the oil is in the middle and the lower part is water. The search for oil and gas is to find the place first. There are many types of geological structures