泸州古隆起地区嘉陵江组层序特征及其对碳酸盐岩储层的控制

在对研究区嘉陵江组沉积背景认识的基础上，通过对嘉陵江组岩性剖面结构的细致分析，将其划分为2个三级层序、6个四级层序和14个五级层序，认识到高频层序在海侵体系域和高水位体系域中有不同的岩性组合类型，建立了研究区嘉陵江组三级层序和高频层序格架。在研究区嘉陵江组储层特征认识的基础上，运用层序地层学原理，通过分析碳酸盐生长与相对海平面变化的关系，以及气候类型对高频层序演化的控制作用，建立了干旱气候背景下高水位体系域和海侵体系域中高频层序与溶蚀孔隙型储层形成的关系模式，并且层序表现出对溶蚀孔隙型储层和膏溶孔洞型储层发育分布具有重要控制作用；认为二级构造层序影响着岩溶缝洞型储层和裂缝—溶洞型储层的形成发育。总结出与各级层序相关的暴露期间大气水溶蚀作用（包括同生期和表生期）为研究区嘉陵江组储层形成的主要机制。

Sequence-Stratigraphic Features and Their Controls on Carbonate Reservoirs for the Triassic Jialingjiang Formation of the Luzhou Paleohigh in Sichuan Basin

Based on the knowledge of the sedimentary setting of the Jialingjiang Formation in Luzhou Paleohigh,with the careful analysis of the configuration of the lithological profile,there are 2 third-order,6 fourth-order and 14 fifth-order sequences distinguished in the Jialingjiang Formation,it indicates that there are the distinct patterns of lithological profile for the high-frequency sequence in the TST and HST.Furthermore,the third-order and high-frequency sequence frameworks of the Jialingjiang Formation are established for the study area.Based on the knowledge of the reservoir features in the Jialingjiang Formation in the study area,using the theory of the sequence stratigrahpy,by the analysis of the relationship between the growth of carbonate and the relative sea level change and the controls of the climate pattern on the evolution of the high-frequency sequence,we establish the models of the relationship between the high-frequency sequence and the formation of dissolution-porosity reservoir in arid climate,in HST and in TST,respectively,and it shows that the sequence controls on the development and distribution of the dissolution-porosity reservoir and the dissolution-cavity reservoir;and we believe the second-order tectonic sequence exerts an influence on the formation and development of the karst reservoir and the fracture-cavity reservoir.It is summarized that the dissolution of the atmospheric water during the exposure(including penecontemporaneous and hypergene) related to the different order sequences is the main mechanism of the reservoir formation for the Jialingjiang Formation in the study area.