论文部分内容阅读
泥岩是一种较好的“封闭体系”，当孔隙水中有大量的ＨＣＯ－３来源时，其中的碳酸盐沉淀形成自生方解石矿物。因此，利用这些自生矿物中的氧同位素组成（δ１８Ｏ值），来推算其形成时的地温及深度，再综合其它资料，可定量计算构造的相对抬升量和剥蚀的厚度。柴达木盆地东部在喜马拉雅造山运动的作用下，第四系形成了一系列背斜构造，其顶部受到了不同程度的剥蚀。将氧同位素地球化学方法运用于该地区，计算出的构造相对抬升量和剥蚀的厚度与大地构造背景相符，可以为研究该区天然气的聚集成藏史、聚集程度和寻找勘探目标提供依据。
Mudstone is a better “closed system”. When there is a large amount of HCO-3 source in the pore water, the carbonate precipitates to form authigenic calcite minerals. Therefore, the δ18O value of these authigenic minerals can be used to estimate the geotemperature and depth during its formation. Based on other data, the relative lift of structures and the denuded thickness can be calculated quantitatively. In the eastern part of the Qaidam basin, a series of anticlines were formed under the action of the Himalayan orogenic movement in the Quaternary. The top of the Qaidam basin was denuded to varying degrees. Applying the oxygen isotope geochemical method to the area, the computed relative tectonic uplift and the denuded thickness are consistent with the tectonic setting, which can provide a basis for studying the history of gas accumulation, accumulation degree and searching for exploration targets.