川西北松潘—阿坝地区油气勘探进展与初步评价

Progress in petroleum exploration in the Songpan-Aba area,northwestern Sichuan,China,and preliminary evaluation

位于青藏高原东北部松潘-甘孜构造带中央部位的松潘—阿坝地区是目前中国石化公司油气勘探与探索的全新领域。2002年以来中国石化南方勘探开发分公司对该区进行了系统的石油地质、重、磁、电、震、遥感、化探等综合勘探与评价研究,发现了相对稳定的若尔盖隐伏地块、多个局部构造显示和化探异常区域,认为该区可能存在下古生界生烃、上古生界储集、三叠系封盖的油气地质条件,评价优选出了若尔盖坳陷的中部凸起及其向北侧凹陷带过渡的斜坡地带为近期油气勘探的有利地区并实施了红参1井的钻探。各项勘探成果资料表明该区应该具有油气勘探前景,但三叠系巨厚且经历了多期形变改造,油气勘探的难度较大,加强随钻跟踪分析、深化油气地质研究并开展物探技术攻关是近期工作的重点。

The Songpan-Aba area located in the central part of the Songpan-Garze tectonic belt on the northeastern Qing- hai-Tibet Plateau is now a frontier area of petroleum exploration for Sinopec. Since 2002, based on systematic petroleum geological investigations, gravity survey, aeromagnetic and electromagnetic survey, seismic telemetric survey and remote sensing and geochemical prospecting, the relatively stable Zoige buried block, manifestations of several localized structures and geochemical anomaly zones have been found. The authors consider that there might exist favorable petroleum geological conditions in this area, i.e. Lower Paleozoic source rocks, Upper Paleozoic reservoir rocks and Triassic seals. The central rise in the Zoige depression and the slope zone where the rise passes northward to a subbasin are the favorable area for recent petroleum exploration, where the Hongcan-1 well was drilled. Various data of exploration indicate that this area should have petroleum prospects. However, it is difficult to carry out petroleum exploration because the Triassic is very thick and has undergone polyphase deformation. Therefore, more efforts should be devoted to follow-up analysis-while-drilling and intensive petrolelum geological research, and geophysical prospecting should be increased in the near future.