| 鄂尔多斯盆地红河油田延长组致密砂岩成藏机制分析 |
| |
| 引用本文： | 马立元,邱桂强,胡才志,徐士林,陈纯芳,李松.鄂尔多斯盆地红河油田延长组致密砂岩成藏机制分析[J].沉积学报,2022,40(6):1762-1773. |
| |
| 作者姓名： | 马立元 邱桂强 胡才志 徐士林 陈纯芳 李松 |
| |
| 作者单位： | 1.中国石油化工股份有限公司石油勘探开发研究院,北京 100083 |
| |
| 基金项目： | 国家科技重大专项2016ZX05002-006中石化科技部项目P13094 |
| |
| 摘 要： | 红河油田位于鄂尔多斯盆地天环坳陷南部,上三叠统延长组处于常压或负压状态,储层致密低渗,成岩与成藏的时间关系在致密砂岩油气成藏动力学机制分析中至关重要。将流体包裹体显微岩相学分析、自生伊利石同位素年代学分析、生烃演化数值模拟和显微镜下观测统计等多种方法结合,研究了延长组储层致密化与石油成藏的时间关系,分析了低动力背景下的致密砂岩成藏机制。结果表明:红河油田延长组储层成岩与石油成藏协同发生,大规模成藏早于关键致密化事件。延长组油藏是在低动力背景下早期充注、优势通道、压差驱动等多种机制共同作用的结果,表现出早期选择性充注、后期继承性充注和浸染式扩展的特点。不同类型砂岩的成藏动、阻力耦合演变关系决定了强非均质性储层的差异成藏富集。
|
| 关 键 词： | 致密砂岩 成藏机制 延长组 红河油田 鄂尔多斯盆地 |
| 收稿时间： | 2021-08-20 |
Reservoir Forming Mechanism of the Yanchang Tight Sandstone in Honghe Oilfield,Ordos Basin |
| |
| Institution: | 1.Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China2.National Center for Geological Experiment and Testing, China Geological Survey, Beijing 100037, China |
| |
| Abstract: | Honghe oilfield is located in the southern Tianhuan Depression of the Ordos Basin. The Upper Triassic Yanchang Formation is in a normal or negative pressure state. The reservoir is tight with low permeability. The time relationship between reservoir densification and formation is very important in the dynamic mechanism analysis of hydrocarbon accumulation in tight sandstones. Combined with microfacies analysis of fluid inclusions, isotopic chronology of authigenic illite, numerical simulation of hydrocarbon generation evolution, and observation statistics under a microscope, this relationship is studied in the Yanchang Formation, and the reservoir forming mechanism of a tight sandstone under low dynamic background is analyzed. The results show that diagenesis and oil accumulation of the Yanchang Formation in the Honghe oilfield occur synergistically, and large-scale reservoir formation is earlier than the key densification event. The Yanchang Formation reservoir is the result of early filling, dominant channel, differential pressure driving, and other mechanisms under a low dynamic background, which shows the characteristics of early selective filling, late inherited filling, and disseminated expansion. The coupling evolution relationship between reservoir forming dynamics and resistance of different sandstones determines the differential accumulation and enrichment of strongly heterogeneous reservoirs. |
| |
| Keywords: | |
|
| 点击此处可从《沉积学报》浏览原始摘要信息 |
| 点击此处可从《沉积学报》下载免费的PDF全文 |
|
