论文部分内容阅读
通过分析川西前陆盆地上三叠统天然气富集的主控因素,明确指出有利区带必须具备的4个条件:①邻近烃源岩,并为天然气运聚指向区;②两期前陆盆地隆起带交汇部位、斜坡部位,构造背景有利;③有利沉积相带;④有利成岩相带或裂缝发育带。通过对川西前陆盆地上三叠统天然气富集空间的分析,提出多类型的岩性、地层圈闭是下一步寻找大中型气田的有利场所。最后用“四图叠合”预测梓潼凹陷、磨溪-潼南地区为最有利的勘探区带。
By analyzing the main controlling factors of natural gas enrichment in the Upper Triassic in the western Sichuan foreland basin, four conditions must be clearly pointed out for the favorable zone: ① adjacent source rocks and gas migration and accumulation zones; ② two foreland basins Uplift zone intersection site, slope parts, structural background favorable; ③ favorable sedimentary facies; ④ favorable diagenetic facies belt or fracture development zone. Based on the analysis of the natural gas enrichment space in the Upper Triassic in the western Sichuan foreland basin, various types of lithology are proposed. The formation trap is a favorable site for finding large and medium gas fields in the next step. In the end, Zitong Depression and Moxi - Tongnan area are predicted to be the most favorable exploration zones by using “four maps”.