地质综合资料在巴布亚褶皱带构造描述中的运用

Application of Integrated Geological Data to Description of Structures in Papua Fold Belt

巴布亚褶皱带为巴布亚弧后前陆盆地重要油气发现带,常规物探因地形起伏大、地表灰岩喀什特化以及高陡地层和断层的存在,不能有效识别构造。为解决该区构造描述方面的难题,此文结合区域应力场分析成果,综合运用地形、地表地质、锶同位素以及钻井等资料,相互补充,减小了构造认识的多解性,达到了构造建模和圈闭描述的目的,取得了较好的应用效果。实践证明在油气勘探和油气藏早期评价阶段,该方法对构造样式、形态和圈闭规模的研究具有积极而重要的意义。

Papua Fold Belt is an important belt with great oil and gas discovery in Papua retroarc foreland basin. However it is hard to identify effectively the structures with the conventional geophysical method due to the rugged mountain configuration, limestone karsts, high dip bedding and faults. To solve the problems in structural description, many geologic data have been used, including the study results about regional stress field, configuration of the ground, surface geology, strontium isotopic data and drilling data. This method can decrease the uncertainty in structure interpretation, and good results have been obtained in structural model building and trap description. It is proved by practice that this method is very significant for study of the structural styles, shapes and trap scale during the early exploration and appraisal stage of oil and gas reservoirs in foreland basin.