南阳凹陷张店油田二次勘探及认识

Secondary prospecting and some understandings to Zhangdian oil field,Nanyang sag

南阳凹陷张店油田油气勘探 3 0年 ,历经预探、详探、二次勘探等 3个阶段。预探阶段探明储量曾为 12 65× 10 4t,详探阶段大幅度下降到到 12 6× 10 4t ,原因主要是勘探早期二维地震测网较稀 ,圈闭不落实 ,加之探井太少 ,对油层特征认识不够深入。二次勘探阶段广泛采用三维地震和测井、钻井等方面的新技术 ,同时应用新理论、新方法开展地质综合研究 ,深化对地质规律的认识 ,不断有勘探新发现 ,探明储量有望再增长到 10 0 0× 10 4t。

Exploration of Zhangdian oil field in Nanyang sag has gone through preliminary prospecting, detailed prospecting and secondary prospecting in the past 30 years. The oil in place firstly decreased from 12.65 million tons estimated at preliminary stage to 1.26 million tons established through detailed prospecting, but now it is expected to increase finally to 10 million tons through secondary prospecting. The causes of ups and downs of oil in place mainly are that 2 D survey grid was sparse and the traps were not accurately positioned at the early stage of exploration as well as that the number of exploratory wells was small and the understandings to reservoir features were poor. Oil in place increased by a big margin with several new discoveries through extensive application of new techniques of 3 D survey, logging and drilling and integrated geologic study by using new theories and new methods at secondary prospecting stage.