THERMAL FLUID ACTIVITIES AND THEIR EFFECTS ON WATER-ROCK INTERACTION IN DONGYING SAG

A large number of thermal fluid activities that occurred in Dongying sag can be proved in terms of gas geochemistry, organic matter thermal metamorphism, homogeneous temperature in fluid inclusions, palaeotemperature gradient, diagenetic mineral, heavy metal element and magmatic activity. The thermal fluids migrate along the deep and large faults whose activities are relatively strong to the shallow parts, and at the same time the corresponding migration pattern centers on the lateral forced convection. In addition, the thermal fluids in the Dongying sag are characterized by the multi-phase activities. The changes in temperature field and geothermal gradient and the mixture of some inorganic matters into the thermal fluids both result in the differences in water-rock interaction intensities and types.