松辽盆地北部油页岩资源潜力评价

Resource Potential Evaluation of Oil Shale in North Songliao Basin

为评价松辽盆地北部油页岩资源潜力,开展了14口地质井的钻探、2 100多口老井的复查和多项油页岩的样品分析测试工作。根据油页岩分析测试资料,结合录井、测井、地震、沉积等研究成果,总结了油页岩主要特征,并用体积丰度法初步估算了埋深小于1km的油页岩和页岩油潜在资源量。结果表明:松辽盆地北部油页岩主要发育在青山口组一段和嫩江组一、二段沉积时期的湖相沉积中,是盆地两次最大湖泛期的产物;嫩江组和青山口组油页岩平均岩石密度分别为2.20和2.18t/m3,平均含油率分别为5.55%和5.39%;油页岩有机质类型为Ⅰ型和Ⅱ1型,处于未成熟-低成熟阶段,有机质丰度极高,是最好的生油岩。松辽盆地北部油页岩分布广泛、层位稳定、资源潜力巨大,初步估算埋深小于1km的油页岩潜在资源量为6 008.40×108 t,页岩油潜在资源量为297.50×108 t。油页岩可以成为未来大庆油田常规油气的重要补充或接替资源。

In order to evaluate the oil shale resource potential in north Songliao basin,14 geological wells are drilled,more than 2 100 old wells are reviewed and a number of oil shale samples are tested.According to the testing data of the oil shale,combined with the well logging,seismic,deposit,and the other research achievements,the main characteristics of oil shale is summarized,and the potential resources of oil shale and shale oil,buried less than 1 000 min depth,are preliminarily estimated using the volume abundance method.Oil shales in north Songliao basin are mainly developed in the lacustrinedeposit when the first section of Qingshankou Formation,the first and second section of Nenjiang Formation deposited,which are the results of the twice maximum flooding period in the basin.The average density of oil shale in Nenjiang Formation and Qingshankou Formation is 2.20t/m3 and 2.18t/m3 respectively,and the average oil yield is 5.39%and 5.55%respectively.The types of organic matter of the oil shale are I and II1 in the developing stage from immaturity to low maturity;and they are excellent hydrocarbon source rocks.Oil shale resources in north Songliao basin are widely distributed,stable in strata,and have a great resource potential.It is estimated that the potential resource of oil shale is 6 008.40×108 t and of shale oil is 297.50×108 t for those are buried less than 1 000 min depth.The oil shale can be an important supplement or replacement of the conventional oil and gas in Daqing oil field in the near future.