峡东地区寒武系岩石学、沉积学特征及储集性

研究区位于扬子板块中段,地层发育齐全,构造层次清晰,交通方便(图1),因此早在本世纪初就有不少地质学家涉足此地(李四光、赵亚曾,1924)。该区地质研究程度较高,尤其在古生物地层学研究方面成果甚丰,其中前寒武系和寒武系的界线剖面已被国际地科联确定为该界线层型的主要参考点;寒武系和奥陶系亦被确定为我国南方寒武系、奥陶系的主要标准剖面;奥陶系与志留系界线剖面正在争取成为国际层型剖面。寒武系的研究有

PETROGRAPHY,SEDIMENTOLOGY AND RESERVOIR CHARACTERISTICS OF THE CAMBRIAN STRATA IN THE EASTERN YANGZI GORGES AREA

This paper deals with petrography, sedimentology and reservoir characteristics of the Cambrian strata in the Yangzi Gorges area. The genesis and diagenesis of the main carbonate rocks in this region are discussed with the aid of cathodoluminescence, oxygen and carbon isotopes, trace elements X-ray diffraction and electron microprobe analysis. The sedimentary environments are believed to be a shallow-marine carbonate platform controlled by the Huangling-Mianyang continental nucleus, including supratidal zone, intertidal zone, subtidal (low-and high-energy) zone, shallow-marine shelf, slope or ramp and basin or interplatform basin. The finely-crystalline dolostones, algal dolostones, grainstones and reef limestones are main reservoir rocks, and black shales in the Shuijingtuo Formation are the best source rocks in the study area.