准噶尔盆地西北缘中拐凸起石炭系火山岩储层裂缝预测

摘要

Fracture is a necessary condition for volcanic effective reservoir. Starting by studying on the present structural features of Zhongguai uplift, finite element numerical analysis technique was used to imitate the paleotectonic stress field and fracturing prox-imity coefficientηof fractures of the carboniferous volcanic reservoir. Fracture development degree and the correspondingηvalues were determined through correlation of η with real data and field observation. The development degree, types and occurrence of fractures were comprehensively predicted by using these criteria and in combination with theories of structural geology and actual production condition. The results showed that fractures were well developed in the carboniferous volcanic reservoir of Zhongguai up-lift. The distribution of fractures was relatively regular, which mainly distributed along the N-E Ke-Wu fault zones, N-S Hongche fault zones and both sides of Hong-3 well eastern fault. The mainly development azimuths of fracture were E-W, N-E and N-N-W. The principal types of fractures were dominated by high angle shear fractures.%裂缝是形成火山岩有效储层的必要条件。从中拐凸起现今构造形迹特征入手，利用有限元数值分析技术，模拟工区石炭系火山岩储层的古构造应力场和破裂接近程度系数(η)；将η与实际资料和野外观测结果对比，确定不同裂缝发育级别及其对应的η值；结合构造地质学理论以及生产实际，对中拐凸起石炭系火山岩储层裂缝的发育程度、裂缝类型及产状进行预测。预测结果表明：中拐凸起石炭系火山岩裂缝非常发育，裂缝分布比较有规律性，主要分布在沿北东向的克-乌断裂带、南北向的红车断裂带及红3井东断裂两侧，裂缝主要发育方位为东西向（EW）、北东向（NE）和北北西（NNW），裂缝的主要类型为高角度剪切缝。