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塔里木盆地北部轮古地区构造多期活动,形成复杂的断裂体系,增强了储层空间的复杂性;奥陶系潜山岩溶发育期次多,表层岩溶作用强烈;储层类型多,地震响应特征多样,纵横向变化大,埋藏深,储集体控制因素多,这些原因造成难以有效进行奥陶系潜山岩溶储层预测。针对塔北轮古奥陶系潜山岩溶储层预测难点,通过多口已钻井统计分析,选取较准确储层参数,设计3个模型,运用正演技术方法,开展了奥陶系潜山岩溶地震响应特征研究,以便指导奥陶系潜山岩溶储层预测。结果表明塔北轮古奥陶系潜山岩溶储层地震响应特征:串珠的大小随着洞穴的规模增大而增大;随着洞穴规模的增大,串珠的主频相应降低;潜山顶部发育串珠时,在潜山波阻抗界面处出现相位上移现象;在顶部发育洞穴时,潜山顶界面处表现为弱反射。随着洞穴距离潜山顶面距离的增大,串珠状反射逐渐下移,潜山顶面也逐渐由弱反射过渡为强波峰反射。随着纵向上2个洞穴间隔距离的增大,串珠间的干涉逐渐由相消干涉过度为相长干涉,串珠纵向延伸也相应增长。
The Turpan-Kudu area in the northern part of the Tarim basin tectonism has multiple stages of tectonic activity, forming a complex fault system and enhancing the complexity of reservoir space. Ordovician buried-hill karstification developed more frequently with superficial karstification; the reservoir types are more and the seismic response characteristics Variety, vertical and horizontal variation, burial depth, reservoir control factors, these factors make it difficult to effectively carry out Ordovician buried hill karst reservoir prediction. Aiming at the difficult prediction of ancient Ordovician buried hill karst reservoirs in Tarim Basin, through the statistical analysis of multi-well drilling, more accurate reservoir parameters are selected, three models are designed and the Ordovician buried-hill karst earthquakes are carried out by forward modeling technique Response characteristics of the study to guide the Ordovician buried karst reservoir prediction. The results show that the seismic response characteristics of ancient Ordovician buried hill karst reservoirs in Tarunai are as follows: the size of beaded beads increases with the increase of cave size; the main frequency of beaded beads decreases with the increase of cave size; When beaded, the phenomenon of phase shift appears at the wave impedance interface of the buried hill; when the top of the cave is developed, the top of the buried hill shows weak reflection. As the distance between the caves and the top of the buried hill increases, the beaded reflection gradually moves down and the top of the buried hill gradually changes from a weak reflection to a strong peak reflection. As the distance between the two caves in the vertical direction increases, the inter-beading interference gradually becomes the constructive interference due to the destructive interference, and the longitudinal extension of the beaded bead also increases accordingly.