| 断层垂向封闭性定量分析及其在渤海湾盆地A油田中的应用 |
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| 引用本文： | 李浩,吴金涛,黄建廷,汪跃,李振鹏.断层垂向封闭性定量分析及其在渤海湾盆地A油田中的应用[J].地质科技通报,2020,39(4):125-131. |
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| 作者姓名： | 李浩 吴金涛 黄建廷 汪跃 李振鹏 |
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| 基金项目： | 国家科技重大专项“渤海油田加密调整及提高采收率油藏工程技术示范”2016ZX05058001-008 |
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| 摘 要： | 在油藏内部，断层垂向封闭程度对原油物性具有重要影响。根据断层封闭机理及其影响因素研究，通过垂直断面方向上的断面正压力（δF）及断裂带物质抗压强度（δC）对比，建立起利用断层紧闭指数（IFT=δF/δC）表征断层垂向封闭性的方法，并将其应用于渤海湾盆地A油田原油物性平面差异的研究中。结果表明:①不同断层的IFT不同，IFT越大，垂向封闭性越好，A油田明化镇组下段断至潜山但不沟通海底的断层，IFT最高，来自深层的热量向浅层运移，形成局部高温环境，生物降解弱，原油物性好；②同一断层不同断点的断面正压力和断层缝充填物质相对含量不同，沿断层走向，IFT也不相同；③A油田断块区主控断层从西南往东北IFT逐渐降低，形成差异生物降解，使地层原油黏度向东北逐渐增大。利用断层紧闭指数法判断油藏主控断层的垂向封闭性，并与原油物性分布的差异性进行对比，两者规律相吻合，表明利用断层垂向封闭性判断油藏原油物性是可行的。
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| 关 键 词： | 断层紧闭指数 断面正压力 抗压强度 地层温度 原油物性 |
| 收稿时间： | 2020-04-30 |
Quantitative analysis of fault vertical sealing ability and its application in A Oilfield of Bohai Bay Basin |
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| Abstract: | In the reservoir, the degree of fault vertical sealing has an important effect on the physical properties of crude oil. Based on the study of mechanism of sealing and its influencing factors, through comparative analysis of the normal pressure on the vertical section (δF) and the compressive strength of material in the facture zone (δC), a method for judging fault vertical sealing ability by using fault tightness index(IFT) is established, which is defined as the ratio of δF to δC and is applied to study on the crude property difference of A Oilfield in Bohai Bay Basin. The result shows that IFT is not the same for different faults and higher IFT values would indicate improved fault vertical sealing property. In case that fault is broken to the base of the buried hill but the seabed is not communicated, heat from the deep layer migrates to the shallow layer, and forms a local high temperature environment in A Oilfield, inhibiting the degree of biodegradation and gives a good crude oil property. Due to the diversity of normal stress on fault surface and the filling substance of fault zone in different locations of the same fault, IFT is constantly changing along fault strike. Owing to IFT values of the main faults in the fault block area with a SW-NE decreasing trend, biodegradation of different levels results in the gradual rise of formation oil viscosity from southwest to northwest. The judging result accords with the crude property difference distribution of A Oilfield, which indicates that the method is feasible to judge fault vertical sealing property. |
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