【摘要】 <正> 1975年,作者参加了川南泸州古隆起三叠系嘉陵江组微相和储集性的专题研究,对500多个岩心薄片和100余铸体薄片作了观察,发现嘉陵江组颗粒碳酸盐岩结构特殊、多样,成岩史复杂而有序,有些特征是国内、外文献中所未见的。作者当时提出过一个成岩作用和鲕溶孔发育模式,现将有关认识和分析作进一步阐述。更多还原

【Abstract】 The most significant event in the diagenetic history of the carbonate rocksfor the 1st and 2nd Members of Triassic Jialingjiang Formation in southernSichuan might be the dissolution and infilling of carbonate grains in synsedi-mentary and early diagenetic stages.Whenever the carbonate sediments werestationed above sea level,the ool-pellet banks were drenched by meteoric water,the aragonite and high-Mg calcite constituting inner part of the grains weredissolved resulting in the appearance of dissolution hole inside the grains.Later,the underground water-table elevated,the lower holes within freshwater phreaticzone would be fully filled with freshwater calcite,and the upper dissolved holesstill in the upper phreatic and vadose zone were only locally and partially filled withfreshwater calcites.Then,new ooid and pellet carbonate layer was sedimentedupon the previous bank while it was submerged under sea level.Again and again,these courses repeated in cycles,and so,a great deal of layers of the dissolvedholes remained so far in the section of Jialingjiang Formation.Consequently,la-yers of dissolved holes and its local distribution of mica-like calcite in the dis-solved holes might be a diagnostic feature of vadose zone or upper phreatic zone,and a textural set of dissolution and infilling of ooides and pellets representsa hiatus of sedimentation.As for oil and gas reservoirs,the most significant pore type of the 1st and2nd Members of Jialingjiang Formation is the dissolved holes of ooid and pelletand that of the dedolomitized dolomites,the primary intergranular holes areof second importance,pores inside bioclasts and between crystals are almostnegligible,while the existence of bitumen is harmful due to its role in blockage.更多还原