松辽盆地三肇凹陷扶余油层致密储层录井评价方法研究

发布时间：2018-04-01 01:26

本文选题：松辽盆地　切入点：三肇凹陷　出处：《东北石油大学》2017年硕士论文

【摘要】：目前,大庆油田进入高含水后期开采阶段,油田剩余可采储量逐步减少,作为接替能源,致密砂岩油藏逐渐成为重点勘探对象。三肇凹陷泉头组扶余油层是三肇凹陷下部含油组合的主要产层,也是松辽盆地非常规储层致密砂岩油勘探的重点,其具有渗透率低、原油流度低、可动油饱和度低、储量丰度低及砂体稳定性差和油层连通差等特点,准确评价难度较大。因此,急需探索一套适用于三肇凹陷扶余油层的致密砂岩油录井评价技术,建立三肇凹陷扶余油层致密砂岩储层录井评价方法,为该区勘探寻找致密砂岩“甜点”区提供可靠的技术支持。致密砂岩储层“甜点”区的确定是在平面上确定烃源岩和主要储层分布区,在纵向上确定相对优质储层的集中发育段。与常规油气储集层相比,致密油储层评价的重点不是落实圈闭,而是通过开展优质烃源岩和储层集中发育段的地质评价,寻找二者的交集-“甜点”区,从而为后期压裂选层提供有力的支撑。因此致密砂岩储层评价的重点包括烃源岩品质评价、储层品质评价、工程品质评价三个方面。本文针对致密油储层评价重点,依据录井技术的特点,研究和分析了三肇凹陷扶余油层烃源岩特性、岩性、物性、含油性、脆性特征,建立了致密油储层录井“五性”评价方法。应用密砂岩储层录井“五性”评价方法,本文解决了油基泥浆钻井条件下烃源岩特性评价及含油性评价的难点,建立了新的泥浆类型下求取TOC的方法和含油性评价标准;结合三轴应力实验,通过应用录井新技术—X射线衍射技术对三肇凹陷扶余油层致密砂岩主要岩性的矿物含量进行了测定,建立了岩性识别标准、脆性指数计算标准和矿物含量交汇图版,形成了致密砂岩储层岩性、脆性和物性录井评价技术;综合应用水平井地质导向技术,建立了扶余油层水平井轨迹解释方法以及水平井产能半定量评价标准。这些方法在三肇凹陷扶余油层得到了应用和验证,在实际应用中取得了较好的效果。
[Abstract]:At present, Daqing Oilfield has entered the late stage of high water cut, and the remaining recoverable reserves in the oil field are gradually reduced as a substitute for energy. The Fuyu reservoir of Quantou formation in Sanzhao sag is the main production layer of the lower part of Sanzhao sag, and is also the key point of tight sandstone oil exploration in unconventional reservoir of Songliao basin, which has low permeability. The characteristics of low mobility, low movable oil saturation, low reserves abundance, poor stability of sand bodies and poor reservoir connectivity are difficult to evaluate accurately. It is urgent to explore a set of tight sandstone oil logging evaluation techniques suitable for Fuyu reservoir in Sanzhao sag, and to establish a method for logging evaluation of dense sandstone reservoir in Fuyu reservoir in Sanzhao sag. It provides reliable technical support for prospecting and searching for dense sandstone "dessert" area. The determination of "dessert" area of tight sandstone reservoir is to determine the distribution area of hydrocarbon source rock and main reservoir on the plane. Compared with conventional oil and gas reservoirs, the emphasis of dense oil reservoir evaluation is not on implementing trap, but on developing geological evaluation of high quality source rock and concentrated development section of reservoir. In order to provide strong support for later fracturing, the emphasis of tight sandstone reservoir evaluation includes hydrocarbon source rock quality evaluation and reservoir quality evaluation. According to the characteristics of logging technology, the characteristics of hydrocarbon source rock, lithology, physical property, oil content and brittleness of Fuyu reservoir in Sanzhao sag are studied and analyzed in this paper. The "five properties" evaluation method of tight oil reservoir logging is established. By using the "five properties" evaluation method of dense sandstone reservoir, the difficulties of source rock characteristic evaluation and oil-bearing evaluation under the condition of oil-based mud drilling are solved. A new method for calculating TOC under new mud types and a standard for evaluation of oil content are established, and combined with triaxial stress experiments, The mineral content of dense sandstone in Fuyu reservoir of Sanzhao sag was determined by using the new logging technique -X ray diffraction technique, and the lithology identification standard, the calculation standard of brittle index and the intersection chart of mineral content were established. The formation of tight sandstone reservoir lithology, brittleness and physical properties of logging evaluation technology, comprehensive application of horizontal well geological guidance technology, The interpretation method of horizontal well trajectory in Fuyu reservoir and the semi-quantitative evaluation standard of horizontal well productivity have been established. These methods have been applied and verified in Fuyu reservoir in Sanzhao sag, and good results have been obtained in practical application.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE142

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