含油气系统油气聚集度

The accumulation rate of oil and gas in petroleum system.

分析了油气不均一聚集的重要性，认为“聚集系数”这一平均概念在油气资源评价中的局限性越来越明显。含油气系统中有成因联系的一群油气藏具有储量规模序列之间的内在联系，以此为理论基础，定义了油气聚集度（同一含油气系统中一群有成因联系的油气藏，按储量规模大小排序后，前若干个油气藏储量之和在所有油气藏总储量中所占百分比）。应用这一特征参数，可描述含油气系统中油气不均一聚集现象，并可对其理论聚集度进行动态分析，预测最终油气聚集度。改进了描述油气藏规模序列结构的Ｚｉｐｆ模型，提出修正Ｚｉｐｆ模型，用于计算油气藏群的理论聚集度。用该修正模型拟合塔里木盆地轮南低隆地区截至１９９５年底发现的三叠系油气藏储量规模序列，认为该地区油气聚集丰度中等。图１参９（王孝陵摘）

The importance of the non equal accumulation of oil and gas is emphasized. It is thought that the concept of average accumulating rate is becoming more and more limited in resources evaluation. Based on the inherent relationship among the reserves of pools of similar origin, a new concept of accumulation rate of oil and gas (which refers to the ratio of the sum of reserves in the first ranking pools with similar origin over that of the total reserves of all pools in the petroleum systems) is defined. This parameter can effectively characterize the non equal accumulating phenomenon in a petroleum system. It is available to analyze the theoretical accumulating rate of oil and gas and predict the end accumulation rate. The traditional Zipf model was improved to describe the structure of pool series more better and to calculate the theoretical accumulation rate of oil and gas dynamically. By applying the new Zipf model to the pool data from the Triassic formation rock in Lunnan low uplift area of Tarim basin as of 1995, it is thought that this area is of middle accumulation rate.