川东北大安寨致密碳酸盐岩储层测井解释评价方法研究

发布时间：2018-05-16 08:21

本文选题：致密油气藏 + 薄层　；参考：《西南石油大学》2015年硕士论文

【摘要】：如今致密油气藏是全球非常规油气勘探的亮点领域同时也是难点之一。川东北大安寨储层包括孔隙型和裂缝孔隙型储层,其具有岩性复杂、孔隙结构复杂、储集空间类型多样和储层非均质性强的特点,同时该区与国内常见致密碳酸盐岩储层不同的是薄层和薄互层较发育。这些特点导致储层的测井响应规律性不强,使储层参数计算和储层有效性评价难度加大,因此需要做进一步的研究,建立一套适用于该区碳酸盐岩油气藏的储层测井识别、评价技术与方法,以便更好地为油藏探勘开发服务。本文通过数值模拟分析了薄层对测井响应特征的影响,并对薄层测井响应校正方法进行了探讨和分析,确立了以反褶积法和频率匹配法相结合的校正方法。在地质规律认识的基础上,通过对研究区岩性、物性、电性、含气性的特征及其相互关系的研究表明,大安寨段储层以介壳灰岩和含泥介壳灰岩为主,物性总体较差,裂缝的发育能有效改善其渗滤性。常规测井结合成像测井、ECS测井建立了岩性识别模式,运用多种方法识别裂缝和储层,划分出了孔隙型和裂缝-孔隙型两类储层。采用了对岩性敏感的自然伽马和电阻率曲线来计算灰岩和砂岩的矿物含量,再利用混合骨架值计算基质孔隙度。采用划分流动单元的方法对取心井段展开了渗透率模型的评价,提高了渗透率模型的精度。用经验统计法、最小孔喉半径法、孔隙结构分类法、孔-渗关系法确定了储层的物性下限值。利用多元线性回归方法对裂缝有效性进行评价,并取得了较好的实际应用效果。本论文的完成为川东北大安寨致密碳酸盐岩气藏的岩性识别、储层识别、储层参数计算和储层有效性评价提供了一套切实可行的方法,为进一步勘探开发提供了更加可靠的测井解释依据。
[Abstract]:Nowadays, tight oil and gas reservoir is a bright spot in global unconventional oil and gas exploration and is also one of the difficulties. The Da'anzhai reservoir in northeast Sichuan consists of pore type and fractured pore type, which has the characteristics of complex lithology, complex pore structure, diverse reservoir space types and strong reservoir heterogeneity. At the same time, the thin layer and thin interbed are different from the common tight carbonate reservoirs in China. These characteristics lead to a lack of regularity of logging response, which makes it more difficult to calculate reservoir parameters and evaluate reservoir effectiveness. Therefore, further research is needed to establish a set of reservoir logging identification suitable for carbonate reservoirs in this area. Evaluation techniques and methods for better reservoir exploration and development services. In this paper, the influence of thin layer on logging response characteristics is analyzed by numerical simulation, and the correction method of thin layer logging response is discussed and analyzed, and a correction method combining deconvolution method with frequency matching method is established. On the basis of the understanding of geological laws, the characteristics of lithology, physical properties, electrical properties, gas-bearing properties and their interrelationships in the study area show that the reservoir in Da'anzhai section is dominated by meso-shell limestone and mud-bearing meso-shell limestone, and its physical properties are generally poor. The development of cracks can effectively improve its percolation. The lithology identification model is established by conventional logging combined with imaging logging ECS logging. The fracture and reservoir are identified by various methods and two types of reservoirs are divided into two types: pore type and fracture-pore type. Natural gamma and resistivity curves sensitive to lithology were used to calculate the mineral contents of limestone and sandstone, and the matrix porosity was calculated by using the mixed skeleton value. The permeability model of coring well is evaluated by dividing flow unit, and the precision of permeability model is improved. The lower limit values of reservoir properties are determined by empirical statistics method, minimal pore throat radius method, pore structure classification method and pore permeability relationship method. The multivariate linear regression method is used to evaluate the fracture effectiveness and good practical application results are obtained. The completion of this paper provides a set of feasible methods for lithologic identification, reservoir parameter calculation and reservoir effectiveness evaluation of tight carbonate reservoirs in Da'anzhai, Northeast Sichuan. It provides a more reliable basis for logging interpretation for further exploration and development.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.81

【参考文献】