TN凹陷不整合结构及其油气地质意义

发布时间：2018-06-04 01:42

本文选题：不整合面 + 结构类型　；参考：《大庆石油地质与开发》2017年04期

【摘要】：TN凹陷经历了侏罗纪至早白垩世裂谷盆地发育全过程,不整合面普遍发育。通过井震结合识别出不同级别不整合界面12个,以超覆不整合、截超不整合、平行不整合及褶皱不整合4种类型为主。研究不整合结构,明确了不整合界面的封闭或疏导作用,当不整合与构造、断层较好匹配时可形成有利圈闭。与不整合相关的油藏类型主要发育4种,分别为多层系叠加反向屋脊断块油藏、水下扇体的构造-岩性油藏、砂体尖灭油藏和潜山油藏。结合油田生产实际分析了不同油藏类型的特点,明确了不同油藏在凹陷的分布规律,对下步勘探具有一定指导意义。
[Abstract]:TN depression experienced the whole development process of Jurassic to early Cretaceous rift basin, and the unconformity surface was generally developed. Through the combination of well and earthquake, 12 different levels of unconformities were identified, including overlying unconformity, truncated unconformity, parallel unconformity and fold unconformity. The structure of unconformity is studied and the sealing or dredging action of unconformity interface is clarified. When unconformity and structure and fault are well matched the favorable traps can be formed. There are mainly four types of reservoirs related to unconformity, which are multi-layer superimposed reverse roof block reservoir, subaqueous fan tectonic-lithologic reservoir, sand body pinnacle reservoir and buried hill reservoir. The characteristics of different reservoir types are analyzed in combination with oilfield production practice, and the distribution of different reservoirs in the sag is clarified, which is of certain guiding significance for the next exploration.
【作者单位】：大庆油田有限责任公司海拉尔石油勘探开发指挥部;
【基金】：国家自然科学基金“致密砂岩微-纳米孔喉体系中油赋存特征和可动性研究”(41672116)
【分类号】：P618.13

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