Some aspects of diagenetic sulphate-hydrocarbon redox reactions
Some aspects of diagenetic sulphate-hydrocarbon redox reactions
复制标题
DOI：
10.1144/gsl.sp.1987.036.01.03
复制
发表时间：
1987
期刊：
影响因子：
--
通讯作者：
H. Machel
中科院分区：
文献类型：
--
作者：
H. Machel
硫酸盐-烃氧化还原反应发生在两个特定的成岩温度/热成熟度水平：分别低于约75-85°C（0.2- 0.3%R0）和高于100-140°C（> 1.5%R0）。在低温/成熟环境中，这些氧化还原反应仅在细菌的介导下发生。在高温/成熟度环境中，这些反应发生热化学反应，某些催化剂必须相互作用，以克服高活化能并以地质学上显著的速率维持反应。对于两种温度/成熟度水平，反应产物和副产物可能是相同的：蚀变和氧化烃（包括沥青）、硫化氢、金属硫化物（包括密西西比河谷型矿床）、元素硫、碳酸盐（主要是方解石和白云石）和其他矿物。这些氧化还原反应的一个重要副产物可能是由固体硫酸盐和/或碳酸盐寄主岩石溶解产生的孔隙度。净反应是放热的，并且释放的热量在某些情况下可能产生地热热点。
Summary Sulphate-hydrocarbon redox-reactions occur at two specific diagenetic temperature/thermal maturity levels: less than about 75–85°C (0.2–0.3% R0), and more than 100–140°C (> 1.5% R0), respectively. In low-temperature/maturity environments these redox reactions take place only with the mediation of bacteria. In high-temperature/maturity environments these reactions take place thermochemically, and certain catalysts must interact in order to overcome the high activation energies and to sustain the reactions at geologically significant rates. The reaction products and by-products may be identical for both temperature/maturity levels: altered and oxidized hydrocarbons (including bitumen), hydrogen sulphide, metal sulphides (including Mississippi Valley Type deposits), elemental sulphur, carbonates (mainly calcite and dolomite), and other minerals. An important by-product of these redox reactions may be porosity resulting from the dissolution of solid sulphates and/or the carbonate host rock. The net reaction is exothermic, and the released heat may generate a geothermal hot-spot in some cases.