摘要
川西气田雷口坡组储层是超深层低渗高含硫气藏，面临高破裂压力的难题，而且由于储层可压性的主控因素不明，准确评价难度大，限制了降低破裂压力工艺措施的针对性使用。为此，文中首先基于施工特征描述，将储层可压性由好到差依次划分为1，2，3，4类；进而以可压性排序为目标，基于施工统计、理论计算和实验分析，明确了储层可压性影响因素，即地应力、岩性、构造、物性、天然裂缝等5个方面；最后，基于灰色关联法定量分析了这些因素对储层可压性的影响程度，筛选了地应力、岩性、倾角、中高角度缝数量、平均孔渗、Ⅰ类储层厚度、储层深度、构造位置作为可压性评价参数。可压性主控因素的明确，为类似超深碳酸盐岩储层的可压性评价、降破措施选择提供了有效的技术支撑。
Abstract
The reservoir of Leikoupo Formation in western Sichuan gas field is an ultra-deep, low-permeability and high-sulfur gas reservoir, which has the problem of high fracture pressure. Moreover, because the main controlling factors of reservoir fracability are unknown, it is difficult to accurately evaluate the fracability, which limits the targeted use of the measures to reduce the fracture pressure. In view of these problems, firstly, based on the description of construction characteristics, the reservoir fracability is divided into1, 2, 3 and 4 levels from good to bad. Then, with the fracability ranking as the target and based on construction statistics, theoretical calculation and experimental analysis, it is concluded that the influencing factors of reservoir fracability include in-situ stress, lithology, structure, physical property and natural fractures. Finally, based on the gray correlation method, the influence degree of fracability is quantitatively analyzed, and the in-situ stress, lithology, inclination angle, number of middle-high angle fractures, average porosity and permeability, thickness of reservoirⅠ, reservoir depth and structural location are selected as the parameters of fracability evaluation. The main controlling factors of fracability are clear, it can provide effective technical support for the evaluation of fracability and the selection of measures to reduce the fracture pressure in similar ultra-deep carbonate reservoirs.
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