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通过对柯柯亚下侏罗统气藏、储层特征分析,认为J1b气藏受构造控制,带油环;有利储集相带为辫状河三角洲前缘水下分流河道和河口坝砂体,在有效含气范围内,富集高产与溶蚀粒内孔、粒间孔的发育程度密切相关,裂缝对改善储层渗流条件起到积极作用。受高阻煤层封挡条件的限制,能有效封挡气柱高度最大在180m左右。针对致密砂岩气层识别难,提出“看井径、重声波、轻电阻率”的三要素法。
Based on the analysis of Kekeya Lower Jurassic gas reservoir and reservoir characteristics, it is considered that the J1b gas reservoir is controlled by structure and has an oil ring. The favorable reservoir facies belts are braided river delta front subaqueous distributary channel and estuary dam sand body , Within the range of effective gas content, enrichment and high yield are closely related to the development of intragranular pores and intergranular pores in the eroded grains, and the fractures play a positive role in improving reservoir seepage conditions. Limited by the blocking conditions of the high-resistance coal seam, the maximum height of the sealing air column can be about 180m. For the identification of tight sandstone gas reservoirs, we propose a three-element method of “Seeing Trail, Sonic Wave and Light Resistivity”.