摘要
在石油勘探的初期，研究生油层成熟度及有机质热变成油过程具有重要意义。对于较古老的沉积盆地，恢复古地温是生油评价电的关键之一。近年来，我们研究了新疆一些地区的古地温，提出了古地温地质模式。古地温地质模式可以追索生油过程。
Paleogeothermal temperatures of the Tarim basin were determined on the basis of the degree of thermal alteration of organic matter and its thermal history. Evidence shows that the paleogeOithermal gradients in this area are generally low: 3℃/100m for the Paleozoic group and 2.5℃/100m for the Mesozoic group. The establishment of a geological paleogeothermal model makes it possible to gain a deeper understanding of oil-generating processes. The peak of oil-generation is generally set at the depths of 5000-6000 m. Higher pressure within the strata is favourable for the preservation of petro-leum at great depths. Organic matter enclosed in carbonate minerals are believed to be another important source of oil. It is suggested that there may be large reserves of natural gas in the area studied with a rough estimation of about 0.6 X 105 billion m3.
出处
《地球化学》
CAS
1985年第3期236-241,共6页
Geochimica
