摘要
泥岩或因自身变化产生的微裂缝,或因地层褶皱和断裂产生的构造裂缝,都将导致泥岩的声波、密度、中子、电阻率等测井曲线的异常变化。依据这一原理,对中原油田、大港油田、塔里木盆地等数十口井的泥岩裂缝发育情况进行了研究,合理地解释了泥岩封闭性与圈闭含油气丰度的关系。泥岩裂缝的发育情况主要取决于成岩阶段,另外可能与厚度、钙质含量和有机质丰度有关。利用测井曲线识别泥岩“假盖层”,可为完井结构、试油气井段的确定提供依据,对深层油气勘探有特别意义。
Microfractures caused by shale sands or self-changes, or stractural fractures caused by fold and formation breakdown will result in the abnormal changes of three-porosity and resistivity logs. Based on this principle, the shale sand fracture developments in several tens wells of Zhongyuan, Dagang oil fields and Tarim Basin have been studied; and the relation between the shale sand closeness and the trapped oil-gas bearing abundance of shale sand is interpreted rationally. The fracture developments mainly depend on the diagenetic stage and may be relative to the thickness, calcium content and organic abundance as well. The mentioned method can help you determine the completion configurations, test oil bearing intervals, so, it is very important to deep oil and gas exploration.
