四川盆地须家河组致密气藏成藏要素及有利区带评价

Tight Gas Accumulation Elements and Favorable Zone Evaluation of Xujiahe Formation in Sichuan Basin

为明确四川盆地上三叠统须家河组致密气成藏要素及有利区带,在重建等时地层与沉积格架的基础上,分析须家河组成藏组合,结合烃源、储层及构造等因素,探讨须家河组致密气藏控藏及富集要素,综合烃源、储层、构造、保存条件、埋深及区内已获有效井地质特征等因素,新建适用于四川盆地须家河组致密砂岩气藏有利勘探区带精细评价的标准体系。研究表明,持续性生烃凹陷、进积型三角洲分支河道砂体以及继承性构造带是须家河组致密砂岩气富集要素,川中-川西过渡带是现阶段四川盆地须家河组致密砂岩气最有利的增储上产地区之一。研究结果对须家河组下一步深入勘探具有重要的指导意义。

The reconstruction of isochronous strata and sedimentary framework were taken to clarify the tight gas accumulation elements and favorable zones of the Upper Triassic Xujiahe Formation in Sichuan Basin.The hydrocarbon accumulation combination was analyzed to discuss the tight gas accumulation and enrichment elements of Xujiahe Formation by combining with source rock,reservoir,structure and other factors.The source rock,reservoir,structure,preservation condition,burial depth and geology understandings of regional effective exploration wells were comprehensively combined to establish a suitable fine evaluation standard system for the favorable exploration zones of the Xujiahe Formation tight sandstone gas reservoir in Sichuan Basin.Research indicates that the tight sandstone gas enrichment elements in Xujiahe Formation consists of the persistent hydrocarbon-generating sag,progressive delta branch channel sandbody and inherited structural zone.The central-western Sichuan Basin transition zone is one of the most favorable zones for tight sandstone gas reserve proving and production increment in the Xujiahe Formation of Sichuan Basin at present.Research could provide certain guidance for the further hydrocarbon exploration in the Xujiahe Formation.