摘要:断层的分段生长和连接控制着断层圈闭的形成，为了研究断层形成过程对圈闭形成的控制作用，应用位移/离距法和位移梯度比法判别断层相互作用阶段，落实断层圈闭的空间匹配有效性。针对空间匹配的断层圈闭，应用最大断距相减法开展断层圈闭形成时期的研究，在成藏关键时期前形成的断层圈闭是油气有利聚集的部位。本文以歧口凹陷歧南斜坡的南大港同向断层与扣村反向断层为例，开展断层圈闭时空配置有效性评价，研究结果表明油气多分布在同时具备空间和时间匹配有效的断层圈闭内，仅具备空间或时间匹配有效性的断层圈闭中未见油气聚集。因此，通过对未钻探断层圈闭开展时空匹配有效性评价，能够有效地降低勘探开发的风险。
关键词: 歧口凹陷/
断层圈闭/
解释不确定性/
时空有效性/
断层分段生长
Abstract:Segmention growth and linkage of normal fault control the formation of fault-bound traps, in order to investigate implication of fault evolution for formation of fault-bound traps, this paper utilizes the ratio of displacement to overlapping space and displacement gradient to distinguish the stage of fault interaction and insure temporal availability of fault-bound trap. Aiming at fault-bound trap equipped with temporal availability, we use maximum throw subtraction to determine formation time of fault-bound traps, which formed before the oil accumulation period were beneficial for oil accumulation. In this study, Nandagang fault and Koucun fault which located in Qinan slope, Qikou Sag are taken as examples to exert the research of temporal-spatial validity of fault-bound traps. The results show that hydrocarbon distribution was found in fault-bound traps which possessed temporal-spatial validity more frequent than which only equipped with temporal validity or spatial validity. Therefore, carrying out temporal-spatial validity assessment for undrilled fault-bound traps could effectively decrease the risk of exploration and development.
Key words:Qikou Sag/
Fault-bound trap/
Uncertainty of interpretation/
Temporal-spatial validity/
Fault segmentation growth
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