廊固凹陷大柳泉构造带气层识别与测试

Identification and Testing of Gas Formations in Daliuquan Structural Belt of Langgu Depression

廊固凹陷是油气勘探的老区,试油证实多口井获得工业油气流,实现了规模整装储量发现。这些成果的取得为发现气层、评价气层、解放气层即找气、试气方面都积累了丰富经验。实践使我们认识到:综合利用各种资料解释气层可以大大提高解释符合率,常规录井、气测录井、测井等各种方法有机结合,是发现气层、识别气层的最有效的办法。中子伽马(NG)时间推移测井仍然是识别气层的有效实用技术。APR-TCP联作和一点法求取气体无阻流量等参数是目前气井测试的适用技术。天然气体积压缩系数大,与油层相比受钻井液滤液的伤害更严重,使用优质轻钻井液、保护油气层是找气、试气的重要前提。同时有许多问题还有待深入研究和思考。

Langgu Depression is an old oil and gas exploration area with industrial oil and gas flow confirmed in oil testing. Large-scale reserves are found in the area. Those results help accumulate the rich experience for discovery of gas formations, assessment of gas formations and emancipation of gas formations, namely looking for gas and testing gas. Based on the practices, it is realized that various data can be comprehensively used to interpret gas formation and substantially improve the conformity rate of interpretation. Organic combination of various methods, such as conventional well log, gas-inspecting well log and logging, is the most effective method to find and identify gas formations. Neutron gamma time lapse logging remains as the effective applicable technology for identification of gas formations. APR-TCP combination and point method to calculate AOF are now the applicable technologies for testing of gas wells. The factor of natural gas volume is big and more seriously damaged by filtration of drilling fluid as compared to oil formations. Use of high-quality and light drilling fluid is an important precondition for looking for gas and testing gas. Meanwhile, a lot of problems still need to be brought under study and consideration.