Petroleum accumulation mode and potential in the eastern section of the southern slope of Dongying Sag
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摘要:
东营凹陷油气资源丰富，但油气分布差异大。东营凹陷南坡东段成藏及油气分布特征研究结果表明，研究区内凸起带、斜坡带和缓坡带的沉积环境和构造条件差异大，油气成藏模式不同。凸起带以不整合遮挡油藏为主，斜坡带以构造油气藏为主并含少量小规模地层超覆油藏，缓坡带以岩性油气藏为主。研究区内断层对油气运移、聚集和油气藏分布都有明显的控制作用。在断层发育区，通过断层、不整合和砂体的三维输导体系，油气可以发生长距离运移，形成构造和不整合油气藏；在断层稀少区，油气以近源运移为主，形成岩性油气藏。初步勘探开发结果显示，岩性油气藏的地层压力高、产量好、前景大，成藏模式为油田老区的“增储上产”指明了方向。
Abstract:The Dongying Sag is a rich reservoir, but the distribution of oil and gas is very uneven. The characteristics of oil accumulation and distribution in the eastern section of the southern slope of Dongying Sag are studied in detail. Results indicate that the uplift zone, slope zone, and gentle slope zone of the study area have diverse sedimentary environments and geological structures, thus different hydrocarbon accumulation modes exist. The uplift zone is dominated by stratigraphic oil pools overlain by unconformities; the slope zone dominated by structural pools with a small amount of stratigraphic oil pools onlapping on unconformities; and the gentle slope zone dominated by lithological oil pools. The faults in the study area have a key impact on the migration, accumulation, and distribution of petroleum pools. In the areas of dense faults, oil migrates over long distances to form structural and stratigraphic oil pools through 3-D conduit systems of faults, unconformities, and sand bodies. In the areas of sparse faults, oil migrates over very short distances to form lithological oil pools close to the source area. The preliminary exploration and development show that the lithological oil pools undergo high pressures, showing good production potential and direction of exploration for additional reserve and yield in a mature field.
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