地应力类型垂向转换及其对煤储层渗透率控制作用

发布时间：2019-03-04 09:34

【摘要】：以沁水盆地寿阳区块和柿庄区块为研究对象,揭示了不同构造应力强度作用下的地应力类型垂向转换机理及其对煤储层渗透率的控制作用。研究认为,构造应力强度决定地应力类型的垂向转化与否,而地应力类型的单一性或多样性是煤储层渗透率相对高低及其变化规律的决定性因素。在构造应力相对不活跃的寿阳区块,地应力类型单一,煤储层渗透率较高且随埋深和地应力增加呈单一指数递减的变化规律;在构造应力活跃的柿庄区块,出现地应力类型在垂向上的转换现象,三种地应力类型共存,煤储层渗透率较低且随埋深增加表现为分带指数递减规律。由于板块活动的影响,中国煤层气盆地承受较强的构造应力,但在不同盆地以及同一盆地内的不同构造位置,构造应力强度存在差异,地应力类型的单一性或多样性不同,煤储层渗透率随埋深变化规律也不同,区分各地区不同深度带所对应的地应力类型是研究煤储层渗透率变化规律的关键。
[Abstract]:Taking Shouyang block and Shizhuang block in Qinshui basin as research objects, the vertical transformation mechanism of in-situ stress type under different tectonic stress intensity and its control on permeability of coal reservoir are revealed. It is considered that the structural stress intensity determines the vertical transformation of the in-situ stress type, and the uniformity or diversity of the in-situ stress type is the decisive factor for the relative permeability of coal reservoir and its variation law. In Shouyang block, where the tectonic stress is relatively inactive, the type of in-situ stress is single, and the permeability of coal reservoir is higher and decreases exponentially with the increase of buried depth and in-situ stress. In Shizhuang block where tectonic stress is active, the in-situ stress type changes in vertical direction. The three types of in-situ stress coexist. The permeability of coal reservoir is low and decreases exponentially with the increase of buried depth. Due to the influence of plate activity, CBM basins in China bear strong tectonic stress, but in different basins and in different tectonic positions within the same basin, the tectonic stress intensity is different, and the in-situ stress types are different. The variation of permeability of coal reservoir with buried depth is also different. It is the key to study the variation law of permeability of coal reservoir to distinguish the types of in-situ stress corresponding to different depth zones in different regions.
【作者单位】：中国石油大学(北京)地球科学学院;油气资源与探测国家重点实验室;中海石油(中国)有限公司非常规油气分公司;中联煤层气有限责任公司;中海石油(中国)有限公司非常规油气管理处;
【基金】：国家科技重大专项(2016ZX05044)资助
【分类号】：TE311

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