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白云岩储层是碳酸盐岩油气领域的研究热点.在分析白云岩优质储层孔—洞—缝演化过程中,白云岩成因是重要的研究内容.以四川盆地西南间断出露的中二叠统栖霞组地层为研究对象,采用岩相学、X粉晶衍射及地球化学方法,讨论白云岩成因.白云岩野外发育于断裂破碎带周围,透镜状产出,多呈斑马纹状构造.显微镜下白云石鉴定为鞍状白云石.此外,白云岩具有较高的白云石有序度,地球化学特征则表现为明显偏负的氧同位素值和高锶同位素值.综合地质资料分析,白云岩为构造热液白云岩化成因.
Dolomite reservoirs are the research hotspot in the field of carbonate oil and gas.In the process of analyzing the pore-hole-seam evolution of dolostone high-quality reservoirs, the genesis of dolomite is an important research content.In the middle of the second The strata of Qixia Formation are studied, and the origin of dolomite is discussed by petrography, X-ray crystallography and geochemical methods.The dolomite is developed in the field around the fracture zone, lenticular and mostly zebra pattern. The dolomite was identified as a saddle-like dolomite under a microscope. In addition, the dolomite has a higher order degree of dolomite and the geochemical characteristics show a significantly negative oxygen isotope value and a high strontium isotope value. According to the comprehensive geological data analysis, Rock is the cause of tectonic hydrothermal dolomitization.