滇黔北坳陷寒武系碳酸盐岩古海洋环境特征及地质意义

为厘定滇黔北坳陷寒武系碳酸盐岩古海洋环境，揭示成岩流体与岩溶作用的潜在联系，并预测有利储层发育层段，基于镇雄羊场碳酸盐岩剖面实测及系统取样基础上，采用微量元素、碳氧锶同位素及铸体薄片等分析手段，地球化学与岩石学方法相结合，探讨碳酸盐岩古海洋环境及地质意义。研究结果表明:滇黔北坳陷寒武系清虚洞组-娄山关组整体为海相环境，古海洋温度处于12.82℃~32.84℃之间，主体为温暖或炎热的亚热带气候。海平面具有主体震荡下降的趋势，存在8期海平面变化旋回，发育对应的岩相组合，其同位素演化曲线可作为地层划分依据。微量元素、同位素地球化学及岩石学特征证实娄山关组岩溶作用相对发育，成岩流体混入强氧化性低温大气水，有利储层纵向上主要分布在海平面下降旋回的高部位。

Characteristic of the Cambrian Carbonate Paleo-ocean Environment in the Dianqianbei Depression and Its Geological Significance

In order to clarify the characteristic of the Cambrian carbonate paleo-ocean environment, to reveal the potential contact of diagenetic fluid and karstification, and predict favorable reservoir development zone, based on the measured carbonate rock outcrop and the system samples, using the trace elements, strontium, carbon and oxygen isotopes and casting thin section data, geochemistry and petrology method, discuss the carbonate paleo-ocean environment and the geological significance. The results show that Qingxudong Formation-Loushanguan Formation of the Cambrian as a whole for the Marine environment in the Dianqianbei depression, the ancient ocean temperature between 12.82℃~32.84℃, subject to warm or hot subtropical climate. Sea level has a main shock downward trend, there are 8 periods of sea level change cycle, development of the corresponding lithofacies combination, and isotope evolution curve can be taken as the basis of stratigraphic classification. Trace element geochemical characteristics confirmed the Loushanguan Formation karstification relative development, diagenetic fluid mixed with strong oxidizing atmosphere water at low temperature, favorable reservoir are mainly distributed in the sea level falling high part of the cycle.