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冲积扇沉积地层厚度变化大,岩性复杂,岩相侧向变化快,给地层对比造成很大困难。通过分析克拉玛依油田六中区下克拉玛依组地层发育和岩相组合特征,确定了研究区标准层对比、旋回对比、等比例对比、相控对比的地层对比原则。研究表明,在地层对比过程中,对于中期旋回,若基准面变化幅度大、分布范围广和识别特征明显,可通过标志层和旋回直接进行识别和对比;对于短期和超短期旋回,若旋回特征受沉积影响较大和部分层段旋回界面不明显,可采用中期旋回约束下的次级旋回进行对比;对厚层叠置砂体或泥岩可采用等比例进行对比;对井间岩相变化大的井可采用相控进行对比。在冲积扇沉积特征研究基础上建立的地层对比原则在地层对比中可起到很好的指导作用。
Alluvial fan sedimentary thick layer thickness changes, lithology complexity, lithofacies lateral changes quickly, to the formation of strata caused great difficulties. By analyzing the stratigraphic development and lithofacies assemblage characteristics of the Lower Karamay Formation in the Karamay Oilfield, the stratigraphic contrast of the standard zones in the study area is determined. The results show that in the process of stratigraphic correlation, for the mid-term cycles, if the datum changes in a wide range and has a wide range of distribution and obvious distinguishing features, it can be identified and compared directly by the marker layer and the cycle. For the short-term and ultra-short cycles, Which is greatly influenced by the sedimentation and the interface of some cycles is not obvious. It can be compared by the secondary cycle under the medium-term cycle constraint. The thick sandstones or mudstones can be compared by equal proportion. Phased control can be used for comparison. The principle of stratigraphic contrast established on the basis of sedimentary characteristics of alluvial fan can play a good guiding role in stratum contrast.