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塔中北坡顺南地区奥陶系储层具有良好的油气勘探前景。结合三维地震精细解释、属性提取等方法,从剖面形态和平面展布特征探讨了走滑断裂的变形样式、形成机理及其石油地质意义,拟为该区地质构造建模和油气勘探提供新的思路。研究表明,顺南地区主要发育NE向、NEE向、NW向3组走滑断裂,其中NE向、NEE向为2组左行走滑断裂,NW向为规模较小的右行走滑断裂;变形样式上,NE向断裂以典型的“花状”构造为主;NEE向和NW向断裂则较为简单,多为单条陡立的隐伏断层。加里东中期Ⅲ幕,塔中Ⅰ号断裂在由南向北挤压作用下强烈逆冲;在其构造变形分段处,产生与塔中Ⅰ号断裂垂直的走滑分量,在顺南地区则分别发育了2组NE向和NEE向的走滑断裂。在上述2条左行走滑断裂的制约下,夹持在断裂间的地块发生逆时针旋转,导致地块内部发育NW向的右行剪切变形。该区走滑断裂对热液岩溶的控制作用主要表现在沿NE向和NEE向走滑断裂的线状岩溶作用,以及NW向断裂参与下的面状岩溶作用;同时也是油气垂向运移的通道。
Ordovician reservoirs in the southern Shunde area of north-central Tarim Basin have good prospect of oil and gas exploration. Combined with the detailed interpretation of 3D seismic data and attribute extraction, the deformation pattern, formation mechanism and petroleum geological significance of strike-slip faults are discussed from the aspects of profile shape and plane distribution, which will provide a new model for the geological structure modeling and oil and gas exploration in the area Ideas. The study shows that there are three main strike-slip faults in the south of Shunnan, NEE and NW, including two sets of left-lateral strike-slip faults in the NE and NEE directions and a NW-trending strike slip strike in the NW direction. The deformation pattern The NE-trending faults are dominated by typical “flower-like” structures. The NEE-trending and NW-trending faults are relatively simple, mostly single steeply buried faults. During the middle Caledonian III episode, the Tazhong I fault thrusts strongly under the extrusion from south to north. At its tectonic deformation segment, it produces a strike-slip component perpendicular to the Tazhong I fault, while in the Shunnan region Two sets of NE-strike and NEE strike-slip faults are developed respectively. Under the constraints of the two left-lateral strike-slip faults, the block sandwiched between fractures is rotated counterclockwise, resulting in the NW-direction right-lateral shear deformation in the block. The control of hydrothermal karst by strike-slip faults in this area is mainly manifested in the linear karstification of strike-slip faults along the NE and NEE directions and the karstification of facies under the NW faultage. At the same time, the vertical migration of oil and gas aisle.