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K40砂层(路易斯安那海上South Timbalier 295区块)的储层和生产参数被用于示踪油水界面,因为该界面在1988年～1994年之间垂向移动了80m。水波及区与地震振幅的强烈降低有关,这由油气开采之前(1988)和开采期间(1994)采集的3-D地震曲线对比观察得出。上新统K40砂层是一沉积于陆坡小型盆地内的超压(0.8psi/ft)浊积储层。电缆测井和地震数据被用于开发该储层的地质模型。此次结合了开采史和测井资料的分析表明,通过对多数储层的时移(4-D)地震勘探可有效地对相对均匀的水波及区成像。在储层中的某些部分缺乏地震暗点是由于低渗透性岩相不良的泄油性所致。此外,用这些数据对原始净产层厚度小于10m的储层带的泄油情况成像是不可能的。这些结果说明了4-D地震分析表征生产储层动态特征的潜力,并表明最初并未打算用于4-D地震分析的开发前地震勘探数据,对地震监测研究而言具有基线的价值。
Reservoir and production parameters of the K40 sand (South Timbalier Block 295, Louisiana Maritime) reservoir were used to trace the oil-water interface because the interface moved 80 m vertically between 1988 and 1994. The area affected by the water is strongly related to the sharp decrease in seismic amplitude as observed by the 3-D seismic curves collected before (1988) and during the mining (1994). The Pliocene K40 sandstone is an overpressured (0.8psi / ft) turbidite reservoir deposited in a small continental slope. Cable logging and seismic data were used to develop the reservoir’s geological model. The analysis, combining mining history and well logging data, shows that relatively uniform water waves and zones can be effectively imaged by time-shifted (4-D) seismic exploration of most reservoirs. The lack of seismic dark spots in some parts of the reservoir is due to the poor drainage of low-permeability lithofacies. In addition, using these data it is not possible to image the drainage of a reservoir zone with an original net pay thickness of less than 10 m. These results illustrate the potential of 4-D seismic analysis to characterize the dynamic characteristics of production reservoirs and show that pre-development seismic data that were not initially intended for 4-D seismic analysis have a baseline value for seismic monitoring studies.