塔河油田三叠系非构造圈闭识别与评价技术

Identification and evaluation of the Triassic non-structural traps in Tahe oilfield

塔河油田勘探开发研究表明,三叠系目的层埋深大,局部构造幅度低,圈闭类型主要为低幅度构造、岩性圈闭及岩性+构造的复合圈闭等隐蔽型圈闭。结合三叠系油气勘探的实践经验,提出了3个层次、9种方法的非构造圈闭识别与评价研究思路。3个层次及有关方法是:进行区域上的整体、动态、综合研究,寻找有利油气聚集带;在有利油气聚集带上,开展以层序地层学研究为基础、地震振幅提取技术为核心的塔河油田非构造圈闭地震识别与评价的系列技术研究,寻找、识别有利的非构造圈闭;在可能的圈闭基础上,利用地震烃类检测技术进行圈闭评价。3个层次、9种方法的全面研究和有机结合是减小非构造油气藏勘探风险,提高勘探成功率的有效途径。

Exploration and development activities in Tahe oilfield indicate that the Triassic targets are characterized by great burial depth and low amplitude of local structures. Its traps are mainly of subtle types, including low amplitude structure, lithologic structures, and lithologic-structural combination traps. This paper puts forward ways of identification and evaluation of non-structural traps based on the experiences of exploration in the Triassic strata. Favorable oil an gas plays are firstly located through an all-round, dynamic, and comprehensive regional study ; then, seismic identification and evaluation techniques of non-structural traps with amplitude extraction as the core are developed based on study of sequence stratigraphy to locate and identify favorable non-structural traps in Tahe oilfield;and finally, trap evaluation is performed by using the technology of seismic hydrocarbon detection. A rational combination of the above-mentioned methods may be a effective way to reduce exploration risks and improve success rate.