庄2断块裂缝特征与成因及其影响

观察码头庄油田庄2断块钻井取心，详细分析了研究区内发育的裂缝，对各种裂缝进行了详细描述．认为研究区内砂岩、碳酸盐岩、泥岩和钙质泥岩中均发育多种裂缝。砂岩中发育垂直裂缝、水平裂缝、斜裂缝和不规则裂缝4种：碳酸盐岩中发育水平充填缝、垂直充填缝、近水平未充填缝和近垂直未充填缝4种：泥岩中仅发育充填斜交缝和未充填平行缝2种。分析裂缝的各种因素，认为研究区内砂岩、碳酸盐岩、泥岩和钙质泥岩中发育的各种裂缝的成因各不相同．砂体中的裂缝主要是构造应力作用的结果，碳酸盐岩中充填缝和未充填缝及泥岩和钙质泥岩中的充填缝和未充填缝都有不同的成因。在裂缝分类和成因研究的基础上，对研究区内应力的平面分布分析，发现研究区内的砂岩裂缝在分布上主要集中于应力释放区，也就是断层附近和地层曲率较大的区域，还发现裂缝导致储层质量在裂缝发育地区和发育层位有所改善．裂缝也造成了储层非均质性的增强。

Characteristics and genesis of fracture and its influence on Block Zhuang2

After the coring observation of .Block Zhuang2 in Matouzhuang Oilfield, we analyzes the developed fractures in study area, finding out many kinds of fractures in sandstone, carbonate rock, mudstone and calcareous mudstone and describing the fractures with detail. There are four types of fractures in sandstones, i.e. vertical fracture, horizontal fracture, inclined fracture and irregular fracture. There are horizontal-filled fi＇acture, vertical-filled fracture, near horizontal unfilled fracture and near vertical unfilled fracture in carbonate rocks. There are the filled oblique fracture and unfilled parallel fracture in mudstones. Through the analysis of contributing factors of fracture, it is believed that the fracture origins are quite different in sandstone, carbonate rock, mudstone and calcareous mudstone and that the sandstone fracture is the result of tectonic stress. The origins of filled fractures and unfilled fractures are all different in carbonate rock, mudstone and calcareous mudstone. Based on the classification and genetic analysis of fracture, we find out that the sandstone fractures are mainly concentrated in stress-release area, i.e. the area around faults or the area with high formation curvature, through the analysis of plane distribute rule of tectonic stress in the area. We find out that the fractures make the reservoir improved in the developed areas and the developed zones of fracture, but they also cause the adding of reservoir heterogeneity.