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通过岩心观察和薄片鉴定,结合阴极发光实验等方法,研究塔东地区寒武系碳酸盐岩成岩作用及储层形成机理。结果表明:研究区寒武系碳酸盐岩沉积后经历了多种成岩作用的改造,既有对储层孔隙发育具有建设性的(白云化作用、溶蚀作用和破裂作用等),又有破坏性的(压实作用、压溶作用、重结晶作用、硅化作用、黄铁矿化作用等)。储层储集空间主要有晶间孔和晶间溶孔、溶蚀孔洞和未充填裂缝空间;储层类型主要有白云岩溶蚀孔隙型和白云岩溶蚀缝孔洞型两类。白云化作用为储层发育提供了基础条件;后期热液溶蚀作用对于储层发育起关键性作用;晚期由于构造破裂作用对于改善储层的储渗性能具有重要意义。白云岩较为发育的斜坡和台地相区与断裂的叠合区域,热液溶蚀和构造破裂更加发育,是研究区寒武系碳酸盐岩优质储层发育的有利区带。
The diagenesis and reservoir formation mechanism of Cambrian carbonate rocks in Tarong area were studied by core observation and thin slice identification combined with cathodoluminescence experiments. The results show that the Cambrian carbonates in the study area underwent several diagenetic alterations after sedimentation, both of which are constructive (dolomitization, dissolution and rupture, etc.) of the reservoir pore development, and destroyed (Compaction, pressure solution, recrystallization, silicidation, pyritization, etc.). There are mainly intercrystalline and intergranular dissolved pores, dissolved pores and unfilled fracture space in the reservoir space. There are two types of reservoir types: dolomite dissolution pores and dolomite dissolution pores. The dolomitization provides the basic conditions for reservoir development. Late hydrothermal dissolution plays a key role in the development of reservoirs. In the late stage, tectonic rupture plays an important role in improving reservoir permeability. The more developed dolomite facies and fault superimposed regions, the more developed hydrothermal dissolution and tectonic rupture, are favorable zones for the development of high-quality Cambrian carbonate reservoirs in the study area.