精细构造解释在苏丹Gasab区块的应用

APPLICATION OF FINE STRUCTURAL INTERPREATION FOR GASAB BLOCK,SUDAN

G asab区块是苏丹M elut盆地的一个短轴背斜,构造上属于北部凹陷东南部的断阶,区块断层发育,断裂系统组合复杂;该区块处于西南和正南方向砂体范围内,由于这些砂体极为发育,纵横向变化大,造成该区块为复杂断块油气田。针对上述情况,在开展G asab区块地震资料解释时,以始新统Y abus IV-V I砂组为主要目的层,进一步查明了该区块的构造及断裂特征、储层的横向分布、物性变化及油气分布规律;在构造层位精细解释中使用了人机联作、时间切片、相干剖面、多线剖面、三维可视化等技术,从而识别出了断层,落实了构造,解释成果用于探井后,发现了一系列含油圈闭,使G asab区块成为继M o leeta亿吨级油田之后苏丹油气储量增长的又一地区。

Gasab block is a brachyanticline of Melut basin, Sudan. It belongs to southeastern fault of norther concave. It has many faults and assemble of rift system is complex. It is in the range of southwestern and souther sand body,which is rich and changes quickly. Gasab block is a complex fault block oil and gas field by this two factors. During the seismic date interpreation of Gasab block, the formation of interest is Eocene Yabus Ⅳ-Ⅵ, and it further investigate the structure and fracture feature, the distribution of reservoir, the change of physical property and the law of distribution of hydrocarbon. Man-machine interaction, time slice, coherence slice, multi-line slice and 3-D visualization are applied to idenfy faults and structure. The results of interprection were used to allocate exploarion well, which found a series of oil traps and got preferable effect. Gasab block based on these understanding is another incremental reserve area after the hundred million tons level Moleeta oilfield was found in Sudan.