柴达木盆地昆北油田切12区下干柴沟组下段砂砾岩储层特征、分类及有效评价研究
发布时间：2019-04-21 20:48
【摘要】：砂砾岩在我国广泛分布,但其具有近物源、厚度大、相变快的特点,储层细分难,流体精确识别难度大,其非均质性强、复模态孔喉结构,参数计算精度低,好差储层区分困难等特点。本文以柴达木盆地昆北油田切12区下干柴沟组下段(以下简称E31)为例,形成了一套扇三角洲相砂砾岩储层厚层细分方法,厘清了储层特征、控制因素及分类方法,提高了砂砾岩储层的物性解释精度和流体识别符合度。(1)形成了一套砂砾岩储层细分研究方法,首先利用岩心和电成像资料建立完整的沉积时间单元的岩石序列及不同沉积时问单元的接触特征,结合岩电对比,建立了常规测井曲线的中子、声波曲线刻度法和中子曲线小波分析法厚层细分方法,目的层划分成三个沉积时间单元,开展了全区闭合对比。(2)研究区储层的物源来自柴达木盆地西部的阿拉尔水系,主要发育辫状河三角洲的平原、前缘两个亚相,主要微相类型是分流河道、水下分流河道及河口坝。(3)通过“四性关系”分析,结合生产动态资料,确定了流体定量识别标准,形成了以全烃值作为判别油气的一种快速识别方法,并且分段(扩径段、非扩径段)、分岩性(砂岩、砾岩)建立物性参数解释模型,与生产动态一致。(4)研究区储层主要岩性为砂砾岩和砂岩,储层孔隙度平均为10.5%,渗透率为3.8mD,属于低孔特低渗储层,物性主要随着粘土含量和粒度变小而变好,并且砂岩对此敏感性要大于砂砾岩,分选性对物性影响居次,碳酸盐含量影响弱；选用储层品质因子和压汞孔喉结构参数将储层分成四类,其中Ⅰ类储层的RQI因子大于1.2,排驱压力小于0.2MPa,孔隙度大于13%,渗透率大于15mD,含油性为油浸级别,占3%,Ⅱ类储层的RQI因子1.2-0.35之间,排驱压力0.2-0.4MPa,孔隙度大于10%-13%,渗透率大于1mD-15mD,含油性为含油-油斑级别,占8%,Ⅲ类储层的RQI因子0.35-0.22之间,排驱压力0.4-1.3MPa,孔隙度大于10%-8.3%,渗透率大于1mD-0.4mD,含油性为油斑-油迹级别,占50%,Ⅳ类RQI因子小于0.22之间,排驱压力大于1.3MPa,孔隙度小8.3%,渗透率小于0.4mD,岩心无显示,占39%,前三类是主要的油气赋存类型；利用核磁共振和压汞进行有效评价,前三类储层的中大孔隙比例一般为30%-35%,中孔比例一般为30%-40%,其余为小孔隙。(5)Ⅰ、Ⅱ、Ⅲ类储层含水上升快,通过注水量下调减缓平面矛盾,Ⅳ类储层的水井通过酸化、增压注水手段增加注水量补充地层能量,Ⅳ类储层的油井通过压裂、完善注采井网提高单井产量。
[Abstract]:Greccia is widely distributed in China, but it has the characteristics of near-provenance, large thickness, fast phase transformation, difficult reservoir subdivision, difficult accurate identification of fluid, strong heterogeneity, complex modal pore-throat structure, and low precision of parameter calculation. The poor reservoir is difficult to distinguish and so on. Taking the lower section of Xiaganchaigou formation (hereinafter referred to as E31) as an example, this paper has formed a set of subdividing methods of fan delta facies sand-gravel reservoir thick layer, and clarified the reservoir characteristics, controlling factors and classification methods, and made clear the reservoir characteristics, the controlling factors and the classification method of the reservoir in the lower section of Xiaganchaigou formation in Kunbei Oilfield. The accuracy of physical interpretation and the coincidence of fluid identification are improved. (1) A set of subdivided research methods of sand-gravel reservoir is formed. Firstly, by using the core and electrical imaging data, the complete rock sequence of sedimentary time unit and the contact characteristics of different sedimentary time units are established, and the neutron of conventional logging curve is established based on the comparison of rock and electricity. The acoustic wave curve calibration method and neutron curve wavelet analysis thick layer subdivision method, the target layer is divided into three sedimentary time units, the whole area closed correlation has been carried out. (2) the source of the reservoir in the study area comes from the Alar water system in the west of Qaidam Basin. The plain of braided river delta is mainly developed with two subfacies in front of it. The main microfacies are distributary channel, underwater distributary channel and estuary dam. (3) through the analysis of "four sexual relations", combined with production dynamic data, the main microfacies are distributary channel, underwater distributary channel and estuary dam. The quantitative identification standard of fluid is determined, and a rapid identification method is formed by using the total hydrocarbon value as a fast identification method to distinguish oil and gas, and the interpretation model of physical parameters is established by dividing lithology (sandstone and conglomerate) into sections (expanding section and non-expanding section). (4) the main lithology of the study area is sand conglomerate and sandstone, the average porosity of reservoir is 10.5%, the permeability is 3.8mD, it belongs to low porosity and ultra low permeability reservoir. The physical properties become better with the decrease of clay content and grain size, and the sensitivity of sandstone is greater than that of sand-conglomerate, the influence of separability on physical properties is secondary, and the influence of carbonate content is weak. The reservoir quality factor and mercury pore throat structure parameters are used to divide the reservoir into four types. The RQI factor of type 鈪，
本文编号：2462545
[Abstract]:Greccia is widely distributed in China, but it has the characteristics of near-provenance, large thickness, fast phase transformation, difficult reservoir subdivision, difficult accurate identification of fluid, strong heterogeneity, complex modal pore-throat structure, and low precision of parameter calculation. The poor reservoir is difficult to distinguish and so on. Taking the lower section of Xiaganchaigou formation (hereinafter referred to as E31) as an example, this paper has formed a set of subdividing methods of fan delta facies sand-gravel reservoir thick layer, and clarified the reservoir characteristics, controlling factors and classification methods, and made clear the reservoir characteristics, the controlling factors and the classification method of the reservoir in the lower section of Xiaganchaigou formation in Kunbei Oilfield. The accuracy of physical interpretation and the coincidence of fluid identification are improved. (1) A set of subdivided research methods of sand-gravel reservoir is formed. Firstly, by using the core and electrical imaging data, the complete rock sequence of sedimentary time unit and the contact characteristics of different sedimentary time units are established, and the neutron of conventional logging curve is established based on the comparison of rock and electricity. The acoustic wave curve calibration method and neutron curve wavelet analysis thick layer subdivision method, the target layer is divided into three sedimentary time units, the whole area closed correlation has been carried out. (2) the source of the reservoir in the study area comes from the Alar water system in the west of Qaidam Basin. The plain of braided river delta is mainly developed with two subfacies in front of it. The main microfacies are distributary channel, underwater distributary channel and estuary dam. (3) through the analysis of "four sexual relations", combined with production dynamic data, the main microfacies are distributary channel, underwater distributary channel and estuary dam. The quantitative identification standard of fluid is determined, and a rapid identification method is formed by using the total hydrocarbon value as a fast identification method to distinguish oil and gas, and the interpretation model of physical parameters is established by dividing lithology (sandstone and conglomerate) into sections (expanding section and non-expanding section). (4) the main lithology of the study area is sand conglomerate and sandstone, the average porosity of reservoir is 10.5%, the permeability is 3.8mD, it belongs to low porosity and ultra low permeability reservoir. The physical properties become better with the decrease of clay content and grain size, and the sensitivity of sandstone is greater than that of sand-conglomerate, the influence of separability on physical properties is secondary, and the influence of carbonate content is weak. The reservoir quality factor and mercury pore throat structure parameters are used to divide the reservoir into four types. The RQI factor of type 鈪，
本文编号：2462545
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