AN APPLICATION OF TTI IN RECONSTRUCTION OF ORIGINAL THICKNESS OF SEDIMENTARY SEQUENCES-A CASE STUDY OF THE WEST SHANXI AND NORTH HENAN AREAS
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摘要: 岩石中有机质的成熟度是它在埋藏史中热演化效应的累积,这种累积效应可用时间-温度指数(TTI值)或镜煤反射率(R°)表示。在取得某地区研究层的TTI(或R°)值及埋藏史后,就可反演出其最大埋深,恢复地层原始沉积厚度。此法的精度取决于地温、厚度及TTI或R°等参数,当研究区地质历史上发生多次降升和沉降时,必须进行深度校正和时间-温度的热校正。Abstract: The maturity of organic matter in sedimentary rocks is the accumulating effects of thermal evolution in burial history. Such an accumulated effect could be expressed by time-temperature-index (TTI) or vitrinite reflectance (R°), The greatest burial depth and the original thickness of sedimentary sequences can be obtained by the method of reversion, once the TTI (or R°) and the burial history in certain areas are available. The precision of this method depends on the parameters, such as geothermics and thickness of sedimentary sequences, TTI,R°,etc.. If upliftings and sudsidings take place,you should make corrections both on the depth and the thermal effects of time-temperature.
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[1] Waplea DW. Time and Temperature in Pecroleum Formation, Application of Lopatma Method to Petroleum Exploration. Bull AAPG, 1980,64(6) [2] 费安琦、汤显明等.构造-热演化模型及其在那尔多斯地区煤成气研究中的应用.煤成气地质研究,北京:石油工业出版社.1987 [3] 周兴熙、袁容.华北盆地南部三盛系分布探讨.石油实验地质,1984,6(2),87-94 [4] 戴金星等.鉴别煤成气的指标.煤成气地质研究,北京:石油工业出版社,1987 -
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