Abstract: In the light of the oil and gas distribution in the Yangxin Series in Sichuan basin and the geochemical characteristics of the soluble and insoluble organic materials contained in the rocks, the author attempts to prove that the black and grey coloured argillaceous micritic limestones are good for source rocks, and that their geochemical indices are quite close to those of the source rocks of marine and continental origin in all known oil regions at home and abroad. Analysis of a number of parameters respecting the maturity of organic materials indicates that there are, in the basin, matured regions, highlymatured regions and over-matured regions, as well as immatured regions. As the transformation of oil and gas is closely related to the maturity of organic materials, so is it with their distribution. In the opinion of the author, on the whole, the most part of the basin is in the highly-matured to overmatured State, so, with the exception of a few places where oil may be available, the basin is primarily gas-producing.

摘要： 本文从四川盆地阳新统油气的分布观状,岩石中不溶和可溶有机质的地球化学特征,论证黑色、灰色泥质、泥晶、细粉晶灰岩具备了生油岩的条件,其地化指标与国内外已知产油区的海相陆相泥质生油岩相近。通过对反应有机质成熟度的多项参数分析,除未成熟区外,成熟区、高成熟区、过成熟区,在盆地内均有分布。不同成熟区与油气的分布有关,油气的演化与成熟度密切相关。总的来看,盆地内广大地区多处于高成熟—过成熟期,因此除局部地区可望获得石油外,主要为天然气。