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中拐凸起石炭系火山岩裂缝是该区火山岩储层的主要储集空间和渗流通道。该区火山岩储层发育有原生缝、次生缝及人工诱导缝等,其中以未充填或半充填的高角度剪切缝最为发育,为研究区的主要裂缝类型。该区裂缝方位主要为近NE向和近EW向,与现今最大主应力方向基本一致或呈锐夹角,有效性好。海西运动期是裂缝的主要形成时期。裂缝发育的影响因素主要包括构造部位、岩性及层厚等。岩性类型不同,裂缝发育程度也不同;裂缝的发育程度与构造位置密切相关,裂缝发育带主要沿断裂带呈条带状分布;由于火山岩普遍成层性差,层厚对裂缝发育的影响不明显。研究认为研究区裂缝发育的主控因素主要为岩性和构造位置。
The crust of Carboniferous volcanic rocks in Zhongguai convex area is the main reservoir space and seepage passage of volcanic reservoirs in this area. There are primary, secondary and artificial induced seams in volcanic reservoirs in this area. Among them, high-angle shear seams, which are either unfilled or semi-filled, are the most developed ones and are the main types of fractures in the study area. The fracture orientation of this area is mainly near NE and near EW, which is basically the same with the present principal stress direction or has a sharp included angle, so it is effective. Hercynian movement is the main period of crack formation. Factors affecting the development of fractures include structural parts, lithology and layer thickness. The lithology types are different and the degree of fracture development is also different. The degree of fracture development is closely related to the tectonic position. The fracture development zones are mainly distributed along the fault zone. Due to the poor universality of volcanic rocks, the influence of layer thickness on fracture development is insignificant . The study suggests that the main controlling factors for the development of fractures in the study area are mainly lithology and tectonic location.