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针对准噶尔盆地西北缘克-百断裂带上盘石炭系老油区勘探的有利储层分布规律、成藏模式和油气藏类型等关键技术难题展开研究,对其控制因素进行了重建。克-百断裂带上盘石炭系的有利储层受断裂、裂缝和长时间风化淋滤控制,储层渗流能力主要决定于微裂缝,而微裂缝主要分布于断裂附近2~3km范围内,断裂间距2~5km,提出了有利储层不受岩性控制、整带分布、沿断裂更发育等新认识,改变了有利储层受安山岩控制、局部分布的原认识。通过重建成藏模式和油藏类型,提出油气沿断裂带富集,改变了断裂起封堵作用的原认识;油藏类型由断块—岩性油藏变为断裂富集的大型地层油藏,由局部含油变为整带含油。在新认识指导下重新勘探,扩大了勘探范围,2005—2007年新增石油探明储量超过以往50年探明石油地质储量之和。
In view of the favorable reservoir distribution, reservoir forming patterns and reservoir types and other key technical problems in the exploration of the Permian Carboniferous series in the northwestern margin of the Junggar Basin, the controlling factors were reconstructed. The favorable reservoirs on the Ke-Bai fault zone are controlled by fractures, fractures and long-term weathering and leaching. The seepage capacity of reservoirs is mainly determined by micro-fractures, while the micro-fractures are mainly distributed within the range of 2 ~ 3 km near the fault. Fractures The interval between 2km and 5km proposed a new understanding that the favorable reservoirs are not controlled by lithology, the distribution of the whole belt and the more developed along the fault, changing the original understanding that the favorable reservoirs are controlled by andesite and the local distribution. Based on the reconstruction of reservoir models and types of reservoirs, it is proposed that oil and gas enrichment along the fault zone changes the original understanding of the fault sealing action. The reservoir type changes from fault block-lithologic reservoir to large-scale reservoir with fault enrichment , From the partial oil into the whole with oil. Under the guidance of new understanding, it has re-explored and expanded the scope of exploration. The new proven reserves of oil in 2005-2007 surpassed the sum of proven oil geological reserves in the past 50 years.