红河油田长8储层水平井测井、录井解释差异性分析

发布时间：2018-03-01 04:40

本文关键词： 水平井测井录井综合解释非均质性　出处：《西北大学》2015年硕士论文　论文类型：学位论文

【摘要】：红河油田延长组长8油层组主产层属于典型低渗透致密砂岩储层,具有沉积物粒度细、厚度薄、储集空间类型多样、孔隙结构复杂、非均质性强、含油分布不均等特点,大规模水平井分段压裂开发配套技术是目前采取的主要手段。已有钻井资料统计表明,水平段储层评价中测井与录井之间存在较明显不一致性,甚至部分井段会出现解释结果之间的较大差异,致使压裂选层方案制定困难。论文主要围绕水平井测井、录井解释结果之间存在的差异问题,对比分析红河油田近几年的直井、斜井、水平井测录井参数特征,结合长8储层区域地质特点,对比分析岩性判别、储层含油性级别、裂缝发育带预测以及与单井日均产油量的关系四个方面的测井、录井解释结果,探讨影响红河油田水平井长8储层测、录井解释结论差异性的关键因素。取得主要认识如下：1、红河油田长8储层纵向、横向的非均质性特征是导致水平井测井、录井解释含油性级别差异的重要因素之一,受井筒周边地质体各向异性的影响,电阻率等物理参数的水平分量和垂直分量相差很大,上下致密围岩、井筒在储层中的相对位置均会造成测录井参数的不一致性。录井主要反映井筒内地质体特征,而测井反映的是井简周围地质体特征。2、水平井特殊钻井工艺导致上返出井口的岩屑特别细碎,复杂井筒环境致使岩屑滞留在井筒内的时间增大,岩屑本身携带的油气损耗较直井增加,录井荧光显示级别偏低,岩性判别准确性降低；同时,受重力及井筒条件限制,靠近水平段下井壁的滞留岩屑(俗称“岩屑床”)会造成探测深度较小的声波时差、微电极、自然伽马、密度等测井参数测量值失真。3、区域上普遍发育的裂缝系统是影响测井、录井解释结果与单井日均产油量差异的重要因素之一。相对于直井,水平段更容易钻遇裂缝发育带,但是,钻井过程中三维空间井筒内液柱压力受重力影响与直井完全不同,导致地层能量释放出现异常、钻井液侵入地层的程度不对称等复杂情况,给裂缝识别工作带来较大困难。4、测井与录井所用技术方法不同、分析角度不同,测、录井参数在水平井中所受干扰因素也不同,其各自评价均存在局限性。将录井参数的直观性与测井参数的高分辨率两种优势相结合,充分考虑红河油田长8储层的非均质性及裂缝发育程度对单井产能的影响,将水平段进行量化分类,通过建立分井区、分类型的综合评价体系来提升测井、录井资料在油田开发方案制定中的作用。
[Abstract]:The main reservoir of Yanchang formation 8 in Honghe Oilfield is a typical low permeability tight sandstone reservoir with fine grain size, thin thickness, diverse reservoir space types, complex pore structure, strong heterogeneity and uneven distribution of oil. The matching technique of large-scale horizontal well fracturing is the main method to be adopted at present. The statistics of drilling data show that there is obvious inconsistency between logging and logging in horizontal section reservoir evaluation. Even some of the well segments will have great differences in interpretation results, which makes it difficult to formulate fracturing and reservoir selection schemes. This paper mainly focuses on the differences between logging and logging interpretation results of horizontal wells, and compares and analyzes the vertical wells in Honghe Oilfield in recent years. The logging parameter characteristics of inclined and horizontal wells, combined with the regional geological characteristics of Chang 8 reservoir, are compared and analyzed in four aspects: lithology discrimination, reservoir oil content grade, prediction of fracture development zone and the relationship between the log parameters and the daily average oil production of a single well. This paper discusses the key factors that influence the logging of Chang8 reservoir in horizontal well of Honghe Oilfield and the difference of interpretation conclusion of logging. The main understanding is as follows: 1. The horizontal heterogeneity of Chang8 reservoir in Honghe Oilfield is the result of horizontal logging. One of the important factors for the difference of oil-bearing level in logging interpretation is that the horizontal and vertical components of physical parameters such as resistivity differ greatly due to the anisotropy of the geological body around the wellbore, and the surrounding rock is dense up and down. The relative position of the wellbore in the reservoir will cause the inconsistency of logging parameters. The mud logging mainly reflects the characteristics of the material body in the interior of the wellbore. The logging reflects the characteristics of the geological body around the borehole. The special drilling technology of horizontal well causes the cuttings coming back to the wellhead to be particularly fine, and the complex wellbore environment results in an increase in the time spent by the cuttings in the wellbore. The oil and gas losses carried by the cuttings themselves are higher than those in the straight wells, the level of fluorescence display in the logging is low, the accuracy of lithology discrimination is reduced, and the limitation of gravity and wellbore conditions, The remaining cuttings near the horizontal section (commonly known as "cuttings bed") will cause logging parameters such as acoustic moveout, microelectrode, natural gamma, density and other logging parameters to be distorted. 3. The commonly developed fracture system in the region affects logging. One of the important factors of the difference between the result of mud logging interpretation and the daily average oil production of a single well is that the horizontal section is more likely to be drilled in a fracture developing zone than in a straight well, but during the drilling process, the pressure of the liquid string in the three-dimensional well bore is completely different from that in the vertical well under the influence of gravity. As a result of the abnormal energy release of formation and the asymmetry of drilling fluid invasion into the formation, it is difficult to identify fractures. The logging and logging techniques are different, the analysis angle is different, the logging is different. The interference factors of logging parameters in horizontal wells are different, and their respective evaluation is limited. Combining the intuitiveness of logging parameters with the high resolution of logging parameters, Considering the influence of the heterogeneity of Chang 8 reservoir and the degree of fracture development on the productivity of single well in Honghe Oilfield, the horizontal section is quantitatively classified, and the comprehensive evaluation system of dividing well area and type is established to improve the logging. The role of logging data in the formulation of oilfield development plan.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE142;P631.81

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