歧北凹陷舌状砂体沉积模拟实验

DEPOSITIONAL SIMULATION OF LOBATE SAND BODY IN QIBEI SAG

张春生 刘忠保 曹跃华 赖志云 高玉华 张服民

Zhang Chunsheng Liu Zhongbao Cao Yaohua Lai Zhiyun Gao Yuhua Zhang Fumin

模拟实验表明,沙体的形态由第1期的叶状变为第4期的舌状,与歧北凹陷沙一段舌状砂体形态类似。沉积体呈溯源退缩势态,厚度与宽厚比渐次减小。以第2期沙层延伸远、分布广,与第1、第3期沙层沟通,构成统一的储集空间。第4期沙层呈孤立的透镜体,被包围在泥质沉积之中,储集性能较差。

The result of simulation test shows that the shape of the sand body formed in the test changed from leaf shape of the first stage into lobate shape of the fourth stage.This is very similar to the lobate sand body of Sha-1 member in Qibei Sag.The first stage depositional body of the simulation test showed degradation tendency towards source area,the ratio of its thickness to its width reduced graduallys the second stage sand bed distributed extensively,and it connected with the first and the third beds, formed a unified reservoir;the fourth stage sand bed was an isolated lenticle surrounded by argillaceous sediments,its reservoiring property is relatively poor.

10.11743/ogg19950212