论文部分内容阅读
柴达木盆地基岩风化壳油藏普遍发育,在昆北等区已形成油田。然而,目前对基岩油藏的成藏背景认识不清,制约了勘探步伐。利用钻井、测井、试油和分析化验等资料对基岩油藏基本特征及成藏条件进行分析,认为该区油藏是受岩性及构造多重因素控制的复合油藏,成藏需紧邻富烃凹陷、具有良好的储盖组合和油源断裂3个基本条件。通过油藏解剖发现,基岩油藏属于源外次生成藏,根据油气侧向运移方式、远近不同建立2种成藏模式:1油源断裂+裂缝输导的近源成藏模式;2油源断裂+不整合面侧向运移+次级断裂辅助运移的远源成藏模式。研究以期对柴达木盆地基岩风化壳油气藏的勘探提供地质理论依据。
The bedrock weathering crust reservoir in the Qaidam Basin generally develops. Oilfields have been formed in the areas such as the northern part of Kunming. However, the current understanding of the background of the bedrock reservoirs has not been well understood and has restricted the exploration pace. The basic characteristics and reservoir forming conditions of bedrock reservoirs are analyzed by drilling, well logging, oil testing and laboratory analysis. It is concluded that the oil reservoir in this area is a compound reservoir controlled by lithology and structural multiple factors. Hydrocarbon depressions, with good reservoir-cap combination and oil source fracture three basic conditions. According to the reservoir anatomy, bedrock reservoirs belong to secondary source reservoir formation. According to the lateral migration of oil and gas, two reservoir modes are established: 1 oil source fracture + fracture source near source reservoir model; 2 Remote source reservoir formation pattern of oil source fracture + unconformity lateral migration + secondary fault secondary migration. The study is expected to provide geological basis for the exploration of bedrock weathering crusts and reservoirs in the Qaidam basin.