塔中地区油气资源评价

系统评价了塔里木盆地塔中地区的烃源岩,采用盆地数值模拟方法定量计算了塔中地区的生、排烃数量。研究表明,塔中地区的油气运移聚集主要发生于早古生代和晚古生代的几次构造运动期间,聚集的油气曾遭受过严重的破坏,塔中地区的构造演化对塔中地区的油气聚集起着至关重要的作用。寒武系和下奥陶统烃源岩生排油时间较早,因此对现今已发现的油藏贡献不大,而晚排出的天然气有利于聚集;中上奥陶统烃源岩生排油延续时间较长,对塔中的油气聚集有实质性的贡献。

EVALUATION OF OIL AND GAS RESOURCE IN CENTRAL TARIM BASIN,CHINA

A systematic evaluation of source rock from central Tarim Basin is provided and the scale of oil and gas generated from source rock in the area is calculated with the method of basin simulation. The study shows that the migration and accumulation of oil and gas chiefly occurred during or before the period of tectonic movements in early Paleozoic and late Paleozoic. Theearly accumulated oil and gas had been destroyed severely. The tectonic evolution in the area is very important to the migration and accumulation of oil and gas. Cambrian and Lower Ordovician source rocks generated and expelled oil at early time, so they paid little contribution to the oil reservoir discovered at present. However, the natural gas expelled from these source rocks at late time is easy to accumulate. The period for middle and upper Ordovician source rocks to generate and expel oil lasted a very long time, so the oil and gas from this source rock provided essential contribution to the oil reservoir in the area.