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相对于常用的多因素叠加法和概率体积法,对页岩气有利区选取和资源评价的三维盆地模拟可以将关键地球化学数据和储集物性等参数在时间和空间上更合理的结合,进而对页岩含气的空间非均质性和聚集过程进行刻画。通过实验数据分析认为,鄂尔多斯盆地张家滩页岩有机质含量高、成熟度适中、储集物性好并且天然气显示良好,具有较大的页岩气资源潜力。利用翔实的地质背景资料、地球化学数据、储集物性参数和现场含气量测试数据等对张家滩页岩的地史(沉积史和构造史)、热史(热流史和热成熟史)和生排烃史进行了三维盆地模拟。解释了目前张家滩页岩埋藏深度与成熟度分布不匹配的原因,预测了该层页岩气的空间分布,获得了该层页岩气的成分、吸游比(吸附气和游离气体积之比)、地质资源量和可采资源量等关键资源评价参数。盆地模拟研究认为张家滩页岩有机质转化率约为20%,平均排烃效率约为80%。目前张家滩页岩气主要以吸附态分布在富县以西地区,地质资源量约为0.15×10~(12) m~3。通过实测孔隙度、成熟度和现场含气量解吸等实验数据对模拟结果的校正表明,三维盆地模拟结果与实测数值吻合性好,可靠性较高。综合研究认为,三维盆地模拟是一种可靠的页岩气资源评价方法,在我国地质资料翔实的研究区具有广阔的应用前景。
Compared with the common multi-factor superposition method and the probability volume method, the three-dimensional basin simulation of the favorable area selection and resource evaluation of shale gas can combine the key geochemical data and reservoir physical properties more rationally in time and space, and further The spatial heterogeneity and accumulation process of shale gas are described. According to the experimental data, the shale in Zhangjiatan, Ordos Basin, is characterized by high organic matter content, moderate maturity, good reservoir properties, good natural gas display and great shale gas potential. Based on detailed geologic background data, geochemical data, reservoir physical parameters and on-site gas content test data, the geologic history (sedimentary history and tectonic history), thermal history (heat flow history and thermal maturity history) of Zhangjiatan shale and The history of hydrocarbon generation and expulsion has been simulated in three-dimensional basin. The reasons for the mismatch between the burial depth and the maturity distribution of Zhangjiadan shale are explained. The spatial distribution of shale gas in this layer is predicted, and the shale gas composition, sorption ratio (sorbed gas and free gas volume) Ratio), the amount of geological resources and recoverable resources and other key resource evaluation parameters. The basin simulation shows that the organic matter conversion rate of Zhangjiatan shale is about 20% and the average hydrocarbon expulsion efficiency is about 80%. At present, Zhangjiathan shale gas is mainly distributed in the west of Fuxian with its adsorption state, and the geological resources amount is about 0.15 × 10 ~ (12) m ~ 3. The correction of the simulation results by the measured data of porosity, maturity and on-site gas content desorption shows that the simulation results in three-dimensional basin are in good agreement with the measured values and have high reliability. Comprehensive studies suggest that 3D basin modeling is a reliable shale gas resource assessment method and has broad application prospects in the informative study area of geological data in China.