Discovery of the Jurassic strata of organic-rich source rocks under the Middle Proterozoic thrust-nappe in Niuyingzi depression, westhern Liaoning Province
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摘要:
研究目的 一直以来辽西牛营子凹陷油气勘探的目的层为中新元古界。由于构造抬升等因素，该凹陷地表未见辽西其他盆地出露的重要油气勘探层系—侏罗系北票组。
研究方法 本次通过辽凌地1井钻探，在牛营子凹陷中元古界碳酸盐岩推覆体下发现了一套厚层暗色泥岩，对其岩性及孢粉组合特征进行研究，并与辽西北票盆地实测的三宝四坑剖面北票组进行岩性组合对比。
研究结果 证实辽凌地1井中元古界碳酸盐岩推覆体以下厚层泥岩为侏罗系北票组。
结论 有机地球化学指标表明，该泥岩具有有机质丰度高、生烃潜力大的特点，是值得关注的优质烃源岩。该套厚层暗色沉积地层的发现表明侏罗系北票组是牛营子凹陷新的勘探层系，这一认识为研究辽西地区构造演化、油气地质条件提供了重要的基础地质资料。
Abstract:This paper is the result of oil and gas exploration engineering.
Objective The target layer for oil and gas exploration in the Niuyingzi depression in western Liaoning Province has been Meso-Neoproterozoic. Due to tectonic uplift and other factors, the Jurassic Beipiao Formation, which is an important hydrocarbon exploration target widely exposed in other basins in western Liaoning, is not found on the surface of this depression.
Methods During the drilling of the LLD1 well, a set of thick dark mudstone layers were discovered beneath the Mesoproterozoic carbonates. Based on correlations of lithology and spore-pollen assemblages of the newly discovered mudstones with those from the Beipiao Formation in the Sanbaosikeng section of Beipiao Basin in western Liaoning Province.
Results The layers discovered were from the Beipiao Formation.
Conclusions Organic geochemical indexes indicate that the mudstone is of high organic matter abundance and high hydrocarbon generation potential. Hence, mudstones from Beipiao Formation in this area is a set of high-quality hydrocarbon source rock worthy of exploration. The discovery of thick dark organic-rich layers indicates that the Jurassic Beipiao Formation is a new target for oil and gas explorations in the Niuyingzi Depression. Moreover, this new discovery also provides important basic geological information for the study of tectonic evolution and hydrocarbon geological conditions in western Liaoning Province.
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