重磁井震联合正反演技术在二连盆地深层目标勘探中的应用

Gravity and magnetic dynamite vibroseis joint forward inversion technology in Erlian Basin application in deep target exploration

二连盆地具有丰富的油气资源,前白垩系作为盆地的主力生油层系,其含油气性早已被证实。但该盆地高力罕凹陷及周缘整体勘探程度较低,早期完成的少量二维地震仅局限在几个独立的凹陷内,无法连片,缺少对该区整体地质结构的认识,油气勘探至今未能取得显著效果。前期研究发现,二连盆地前白垩系地层分布面积广,烃源岩有机质丰度高,成熟度高,处于成熟凝析油湿气阶段。前白垩系地层钻探程度低,探索前白垩系含油气性,实现二连盆地新层系勘探突破,拓展二连盆地战略接替新层系。近年来,高精度重磁勘探通过重磁井震联合正反演等针对性处理解释技术,较好恢复了该盆地前白垩纪盆地原貌,有望开启研究二连盆地深层地质结构的新篇章。

Erlian Basin is rich in oil and gas resources.As the main source layer of the basin,the pre-Cretaceous has long been proved to be oil-bearing.However,the overall exploration degree of the Gaolihan Depression and its periphery in this basin is low,and the small number of 2D earthquakes completed in the early stage are only confined to several independent depressions,which cannot be connected,and the lack of understanding of the overall geological structure of the area has not achieved significant results in oil and gas exploration so far.Pre-vious studies have found that the pre-Cretaceous strata in Erlian Basin are widely distributed,the source rocks have high organic matter abundance and maturity,and are in the mature-condensate wet gas stage.The drilling degree of the pre-Cretaceous strata is low,and the exploration of oil and gas in the pre-Cretaceous strata can achieve a breakthrough in the exploration of new strata in Erlian Basin,and expand the strategic replacement of new strata in Erlian Basin.In recent years,high-precision gravity and magnetic exploration has restored the ori-ginal features of the pre-Cretaceous basin by means of specific processing and interpretation techniques such as gravity and magnetic well vibration combined forward and inversion,which is expected to open a new chapter in the study of the deep geological structure of Erlian Basin.