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准噶尔盆地车排子地区石炭系内发育有多条逆冲断层和多样的火山岩,且火山岩储层中构造裂缝发育。为了研究逆冲断层发育区火山岩裂缝分布模式,以车排子地区石炭系火山岩为例,分析了裂缝在纵向上和平面上的分布特征,并引入裂缝分布范围的“质心”概念,定量研究了裂缝分布范围在三维空间中的变化特征,提出了逆冲断层发育区火山岩裂缝分布模式。研究认为:裂缝空间分布范围变化特征有4种类型:质心正向偏移+密度值变大型(Ⅰ型)、质心负向偏移+密度值变大型(Ⅱ型)、质心正向偏移+密度值减小型(Ⅲ型)、质心负向偏移+密度值减小型(Ⅳ型)。逆冲断层发育区火山岩裂缝具有条带状楔形质心偏移模式,该模式特点为:平面上,裂缝分布形态呈现条带状;纵向上,裂缝分布形态呈现楔形,同时受到火山岩岩性的影响,局部裂缝的分布范围变大;裂缝分布范围的“质心”会在断层和火山岩岩性的控制作用下发生偏移。裂缝分布范围的“质心”概念的引入,可为裂缝分布规律的研究提供一种新的思路和方法。
There are a number of thrusts and volcanic rocks developed in the Carboniferous of Chepaizi area in the Junggar Basin, and structural fractures are developed in volcanic reservoirs. In order to study the fracture distribution pattern of volcanic rocks in the thrust fault zone, taking the Carboniferous volcanic rocks in Chepaizi area for example, the distribution characteristics of the fracture in the longitudinal and in the plane are analyzed. The “centroid” concept of fracture distribution is introduced to quantify The variation of fracture distribution in three-dimensional space is studied, and the fracture distribution pattern of volcanic rocks in thrust zone is proposed. The study shows that there are four types of changes in the spatial distribution of fractures: positive center of mass + large density (type Ⅰ), negative center of mass + larger density (type Ⅱ), positive center of mass + Decrease in density (type III), negative shift in center of mass + decrease in density (type IV). The volcanic fractures in the thrust fault zone have a banded wedge-shaped centroid migration pattern. The characteristics of this pattern are as follows: the distribution of fractures presents a banded shape in the plane; in the longitudinal direction, the fractures distribute in a wedge shape and are affected by volcanic lithology, The distribution range of local cracks becomes larger; the “centroid” of the fracture distribution range will shift under the control of faults and volcanic lithology. The introduction of the concept of “centroid” in the range of fracture distribution can provide a new idea and method for the study of fracture distribution law.