川东北地区飞仙关组-长兴组储层沥青反射率及含硫量特征

川东北地区飞仙关组-长兴组储层沥青主要为焦沥青,按光性特征可分为均质沥青、均匀长条状沥青、镶嵌结构沥青、小球体沥青、针状结构沥青、香肠状沥青、微粒状沥青;均匀长条状沥青各向异性强,ΔR大于0.5%,具有强的各向异性小球体沥青的ΔR大于1.2%,它们BR max和BR min的方差往往小于0.08,其平均值可作为成熟度的评价指标;沥青中硫含量高,可能是小球体沥青形成的一个重要因素,研究硫与沥青之间的关系对该区高含硫化氢气藏的成因研究具有重要的意义.

Reflectance and Content of Sulfur Character of Bitumen in the Feixianguan-Changxing Formation, Northeastern Sichuan

The tectonic evolution of the Yangtze block constrains the formation of marine oil reservoirs.Deformation in the southeast margin of the Yangtze block is the key to understand the deformation of the whole Yangtze block.On the basis of a geological structure analysis,three important deformational stages have been recognized:(1) Top-to-NW shear deformation in the Yunkai area and top-to-ESE in the Wuyi area in the Early Paleozoic;(2) Top-to-NE thrust in the Yunkai and Zhaoqing area in the Early Mesozoic;(3) brittle deformation in the Wuyi area in the Late Mesozoic.The geodynamics of deformations has been discussed based on the newly recognized structural evolution.These conclusions are helpful to studying and exploration of carbonate petroliferous prospect in South China.