伊通地堑油气资源的定量评价

AN EVALUATION OF HYDROCARBON RESORCES OF THE YITONG GRABEN

李伟 李明诚 李广东

Li wei Li Mingcheng Li Guangdong

中国地质大学 北京100083

China University of Geosciences, Beijing

伊通地堑自1987年以来钻井百余口,但用传统方法计算出的资源量与实际勘探结果相差太大。作者利用自己所建立的模拟方法,对本区重新进行了生、排烃和最大聚集量模拟。根据模拟结果,本区已发现的资源量与最大聚集量之比仅为10%.造成这种情况的原因主要是由于本区沉积物近物源、分选差,使得聚集层与泥岩之间的物性差很小,导致区域性盖层或直接盖层缺乏以及二次运移空间太大,大量油气被吸附或散失在地层之中而难以聚集。

More than 100 wells have been drilled in the Yitong graben since 1987. Heowever, there is a considerable difference between the results respectively from previous calculation and exploration. By using the method of the authors, the generation expulsion and accumulation of hydrocarbons were computed in the area. The result showed that the present discovered resources is only 10% of the total accumulation. The main reasons were explained as follows: sediments are badly sorted because of being near sourceland, which resulted in a little difference in properties between reserviors and mudstones, and lack of regional seals or direct caprocks. Due to large space of secondary migration most of hydrocarbors was absorpted or escaped in the horizons and was difficult to form pools.

https://doi.org/10.11781/sysydz199601071