塔里木盆地中石化探区含氦气藏资源调查研究*

为了对塔里木盆地中石化探区含氦气藏资源进行调查研究,在广泛调研前人氦气研究成果的基础上,采集了塔里木盆地中石化探区9个井区、6个层系的22个天然气样品,利用质谱法对天然气中的氦气含量进行分析,并探讨了不同地区氦气成藏的主控因素。结果表明,巴什托地区BK3井巴楚组天然气2个样品氦气含量为0.103%、0.116%,达到了含氦气藏的标准; 顺北地区奥陶系6个天然气样品氦气含量在0.026%~0.151%之间,仅1个样品达到含氦气标准。塔北地区寒武系—古近系32个天然气样品的氦气含量在0.01%~0.08%之间,均未达到含氦气标准。塔里木盆地氦气成藏主要受氦源、深大通源断裂、成藏期次、保存条件等因素共同控制。巴什托地区、顺北地区是氦气的有利聚集区带,塔北地区氦气成藏条件相对不利。

Investigation and study on helium gas reservoir resources in Sinopec exploration area of Tarim Basin

We have conducted extensive research on previous helium research to investigate the helium gas reservoir resources in Sinopec exploration area of the Tarim Basin. 22 natural gas samples from nine oil and gas reservoirs and six strata have been collected to determine the helium content in natural gas by mass spectrometry. Based on the analytical results,the main controlling factors of helium accumulation in different zones of the Tarim Basin have been discussed. The results show the helium content of two natural gas samples from the Bachu Formation of well Bk3 in Bashtar area is 0.103% and 0.116%,which meets the standard of helium reservoir;The helium content of six Ordovician natural gas samples in the Shunbei area is 0.026%~0.074%,with only one sample meets the helium reservoir standard. The helium content of 36 Cambrian and Paleogene natural gas samples in the Tabei area is 0.01%~0.08%,which does not meet the helium reservoir standard. Helium accumulation in the Tarim Basin is mainly controlled by helium source,deep-large fault,accumulation period,preservation conditions and other factors. Based on the above data,Bashtar area and Shunbei area are favorable accumulation zones for helium enrichment,while the helium accumulation conditions in the Tabei area are relatively unfavorable.