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以四川盆地川中磨溪构造下三叠系嘉陵江组二段为研究对象,研究海相碳酸盐岩台地多旋回小层精细划分与对比方法。通过对海水咸化旋回、相对海平面变化旋回、古气候变化旋回沉积特征与成因的分析,磨溪地区嘉二段沉积期主要发育潮下型碳酸盐米级旋回层序,沉积界面特征明显并具有一定的成因联系,这种高频沉积旋回具多成因机制特征。在此基础阐明了高频米级旋回的划分原则,提出了一种多旋回沉积界面优选的依据与方法,据此,重新厘定了川中磨溪构造嘉二段小层划分方案。通过精细对比,建立了近于等时的地层格架。该方法有效地避免了单纯运用岩电特征进行地层划分对比时带来的多解性问题,并使各亚段和小层接近于等时的沉积体,为沉积微相及储层的成因和分布研究奠定了可靠的地层学基础。
Taking the second member of Lower Triassic Jialingjiang formation in Moxi tectonics of Sichuan Basin as research object, the fine division and contrast method of polycyclic small layers in marine carbonate platform are studied. Based on the analysis of seawater salinization cycle, relative sea level change cycle and paleoclimate change and sedimentary characteristics and genetic analysis, the sedimentary period of the Jia 2 member in Moxi area is characterized by subtidal carbonate-type cycles and obvious sedimentary interface characteristics And has a certain genetic relationship, this high-frequency sedimentary cycles with a multi-genesis mechanism. On this basis, the principle of division of high-frequency rice-level cycles is clarified, and a preferred basis and method for multi-cycle depositional interface is proposed. Through the fine comparison, the stratigraphic framework of nearly isochronous has been established. The method effectively avoids the problem of multi-solution when stratigraphic division and comparison by simply using the characteristics of the rock electrical and makes the sub-sections and sub-layers close to the isochronal sedimentary bodies, which are the causes of sedimentary microfacies and reservoirs and Distribution studies have laid a solid foundation for the formation.