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为解中国南方海相页岩气成藏的基本特征,厘清成藏要素,建立符合中国复杂构造背景下页岩气储层选区评价指标等问题,借鉴美国页岩气储层评价指标,结合目前页岩气勘探评价成果,分析得出:中上扬子地区龙马溪组底部富有机质页岩储层分布连续、埋深适中、构造稳定,富有机质页岩在区域上分布连续,但含气性在局部表现为不连续;根据构造改造的程度,将中上扬子地区龙马溪组页岩分为构造改造区、靠近剥蚀区和构造稳定区三种类型.其中构造稳定区页岩储层表现为超压、含气量高,气井试采初期产量高,是中国中上扬子地区海相页岩气成藏的最有利区.
In order to understand the basic characteristics of marine shale gas accumulation in southern China, clarify the factors of hydrocarbon accumulation and establish the evaluation index of shale gas reservoirs consistent with China’s complicated tectonic setting, and draw lessons from the evaluation index of shale gas reservoirs in the United States, The result of shale gas exploration and appraisal shows that the organic-rich shale reservoirs at the bottom of Longmaxi Formation in middle-upper Yangtze region are distributed continuously, with moderate depth and stable structure. The organic-rich shale is distributed continuously in the area, According to the extent of structural alteration, the shale in the Longmaxi Formation in the Upper-Upper Yangtze region is divided into three types: structural alteration zone, denudation zone and structural stability zone, in which the shale reservoirs in the structural stability area are super Pressure, high gas content, gas wells early trial production of high yield, is China’s Upper Yangtze River area shale gas accumulation of the most advantageous area.