海相碳酸盐岩和泥岩生烃动力学特征对比分析

The Comparative Analysis of the Hydrocarbon Generation Kinetics Characteristics of Marine Carbonate Rocks and Marine Mudstone

选取三塘湖灰岩和下马岭页岩分别代表海相泥岩和海相碳酸盐岩开展开放体系下的生烃动力学实验。动力学模拟结果表明三塘湖灰岩成油、成气活化能基本为单一活化能分布,下马岭页岩活化能呈现多活化能分布的特点。将两样品的动力学参数结合塔里木盆地满东1井区埋藏史-热史进行地质应用。结果表明海相碳酸盐岩的生油门限(2 000 m)较海相泥岩的生烃门限(3 000 m)浅,但在5 000 m以前,海相泥岩的生油速率较慢;而海相碳酸盐岩的生气门限比海相泥岩的生气门限大。在6 000 m左右二者都达到生气高峰,但碳酸盐岩的成气转化率增加速率比较大。

Use Santanghu limestone and Xiamaling shale respectively represent marine carbonate rocks and marine mudstone, doing research on their hydrocarbon-generating kinetics characteristics in opening system, the results show that the activation energy of oil and gas generation of marine carbonate rocks （Santanghu limestone） have a smaller distribution range, the activation energy of oil and gas generation of the marine mudstone （ Xiamaling shale） have a larger distribution range. And applied the simulation results in well Mandong 1 in Tarim Basin, the comparisons show that： oil generation threshold depth of marine carbonate rocks （2 000 m） is 1 000 m shallower than the oil generation threshold depth of marine mudstone, but before 5 000 m depth, the oil generation rate of the marine mudstone is slower. The gas generation threshold depth marine carbonate rocks are deeper. The hydrocarbon generation peak of marine carbonate rocks and marine mudstone are both at 6 000 m, but the gas generation rate of the marine carbonate rocks is faster.