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上扬子地台页岩气资源丰富,特别是牛蹄塘组勘探潜力巨大。花垣页岩气区块位于上扬子地台牛蹄塘组主要页岩气富集区,其页岩气勘探潜力亟待深入发掘和准确评价。运用地层对比、储层分析和烃源岩地球化学分析等手段,结合前人研究成果,对花垣页岩气区块的构造、储层和烃源岩特征进行了系统研究。厘定了牛蹄塘组的分布范围、储层物性、烃源岩厚度等参数及其分布特征,结合渝科1井和岑页1井的含气量测试结果,进一步计算了区块资源量。花垣页岩气区块牛蹄塘组的有机质类型主要为Ⅰ型和Ⅱ1型;烃源岩有机质含量高,其平均值为3.52%;镜质体反射率平均值为3.58%,达到成熟晚期阶段;储层具有低孔—超低渗、高比表面积的特征;区块的可采资源量达31.87×108 m3。花垣页岩气区块具备了较好的烃源岩、储层及埋藏条件,可采资源量大,可以优选区块中上部的民乐至龙寨一线进行下一步的勘探和评价工作。
Shale gas is abundant in the Upper Yangtze platform, especially for the Niutitang Formation. The Huayuan shale gas block is located in the main shale gas enrichment area of the Niutitang Formation in the Upper Yangtze platform. The exploration potential of shale gas needs further exploration and accurate evaluation. By means of stratum contrast, reservoir analysis and geochemical analysis of source rock, combined with the previous research results, the characteristics of the structure, reservoir and source rock of the Huayag shale gas block are systematically studied. The distribution range of the Niutitang Formation, reservoir physical properties, source rock thickness and other parameters and their distribution characteristics are determined. Based on the gas content test results of wells Yuke 1 and Cen page 1, the amount of block resources is further calculated. The organic matter types of the Niutitang Formation in the Huayupang shale gas block are mainly Type I and Type II1. The organic matter content of the source rock is high, with an average of 3.52% and the average vitrinite reflectance is 3.58%, reaching the late mature stage The reservoirs have the features of low porosity-ultra-low permeability and high specific surface area. The recoverable resources of the block are 31.87 × 108 m3. The Huayuan shale gas block has good source rocks, reservoirs and burial conditions, and the recoverable resources are large. It is possible to optimize the prospecting and evaluation of Minle to Longzhai in the upper part of the block.