罗家地区沙三段泥质岩裂缝特征研究

Study on Characters of Muddy Fractural Reservoirs in Luo Jia area

对济阳坳陷沾化凹陷罗家地区泥质岩储层的裂缝类型、识别特征进行了研究 ,将本区的裂缝分为 4种 :构造缝、层间页理缝、成岩收缩缝和有机质演化异常压力缝 ,这些裂缝的识别特征及成因机制各不相同 ,其对储层的贡献也不同 ;首次提出了本区裂缝发育的主要控制因素为 :区域构造应力、构造部位、岩性、岩相、岩层厚度、埋深及地层压力。这项研究对济阳坳陷及类似地区泥岩油气勘探有重要一定的指导和启示意义。

In Luojia area of JiYang depression,fractural reservoirs are fonud in muddy and shaly rocks of No.3 member in Sha HeJie formation,and high oil production is obtained in some wells.The lithology of productive formation includes oil shale,oil mudstone,limy mudstone and marlstone.Studies on cord and thin section shows that there are 4 types of fractures:tectonic fracture,foliation interbeds,constricted fissure and fracture during to abnormal pressure.The genetic mechanism and identifying characters of these fractures are different,and statistical figures shows that tectonic fracture is the most important type of all.Regional tectonic stress,lithology,lithofacies,thickness and depth of rock are main factors controlling the tectonic fracture distribution.