徐州地区寒武系豹皮灰岩的岩性特征及其成因机制分析

Lithologic characteristics of leopard limestone in Cambrian period and analysis of its formation mechanism in Xuzhou area

徐州地区的寒武系地层岩性主要以碳酸盐岩为主,地层中出现多层厚层状豹皮灰岩。对于寒武系豹皮灰岩的岩性特征研究可为当地古地理环境的判断和还原提供依据;基于近年来发现碳酸盐岩具有油气显示,对豹皮灰岩进行综合分析具有一定的地质油气意义。对徐州地区寒武系地层中豹皮灰岩的岩性特征进行了研究,并在此基础上对其成因进行了仔细分析,表明了豹皮灰岩的白云岩化作用发生在成岩早期,在低盐度混合水动力条件下回流渗透白云岩化成岩。

The lithology for Cambrian strata in Xuzhou area was mainly the carbonates, leopard limestone in a multi thick layers was occurred. The study of lithologic characteristics of leopard limestone could provide foundations for the judgment and reduction of the local paleogeographic environment. Based on the discovery of oil and gas indications for the carbonate rocks, the authors made a comprehensive study on leopard limestone, and it was of geological oil and gas significance. The authors studied the lithologic characteristics of leopard limestone exposed in Cambrian strata in Xuzhou area and analyzed its formation mechanism in details. The study showed that the dolomitization of leopard limestone was occurred in its early diagenesis, the environment of diagenesis was low salinity return permeability on conditions of mixed hydrodynamics.