鄂尔多斯盆地中南部长7陆相页岩气评价中的关键参数研究

发布时间：2018-06-02 05:16

本文选题：陆相页岩 + 关键参数　；参考：《西北大学》2016年博士论文

【摘要】：陆相页岩在沉积环境、物源、矿物组成、有机质类型和热演化程度方面与海相页岩相比存在明显特殊性,表现为相变快,粉砂质隔夹层发育,残余油饱和度较高,因此资源评价参数的研究具有重要意义。本论文选择鄂尔多斯盆地甘泉-富县地区长7段陆相泥页岩为研究对象,在测井数据标准化的基础上,划分长7段地层,确定地层构造格架,充分利用重点井的岩心描述和测试分析数据,探索泥页岩岩性、有机碳含量、含气性和脆性的测井响应特征,在理论探讨基础上优选方法,建立了该区长7段陆相页岩气评价关键参数的解释模型,揭示了关键参数在纵向和平面上的分布规律,预测了页岩气富集的有利区,为甘泉-富县地区的陆相页岩气评价和进一步勘探提供了重要的理论依据。研究认为：(1)三维交会图法对长7段复杂岩性的识别度较好,识别的页岩层系厚3.7～110.9m,最厚处在FY2和YY34井附近；(2)泥页岩矿物组成依次为粘土矿物、长石、石英、碳酸盐矿物和黄铁矿,有机碳含量在2.0%～8.0%之间；(3)泥页岩总体表现为“弹-短塑性”的力学特征,受力后以多重水平劈裂式破坏为主,脆性页岩在下寺湾-桥镇地区较发育,约占页岩总厚的60%;(4)单井解析气量为0.03～3.77cm3/g,残余气量为0.16-0.72cm3/g,吸附气量主要在1.2～2.0cm3/g之间,平面上下寺湾-桥镇以南地区的页岩吸附气量较高,八卦寺-王庄台地区和下寺湾-桥镇西南部地区的游离气饱和度较高；(5)根据各关键参数在单井纵向上的特征分析及空间上的配置关系,对长7段平面有利目标进行了预测,桥镇以南、八卦寺-和尚塬地区最为有利。形成了多个关键参数的评价方法：(1)针对纯页岩和粉砂质泥页岩,分别建立了敏感测井多元逐步回归解释有机碳含量的方法；(2)在分析泥页岩弹性参数和应力-应变特征、岩石破裂模式和脆性表现的基础上,分岩性拟合横波时差与纵波时差和密度的关系,构建横波波速计算模型,计算动态力学参数,并开展动、静力学参数的校正分析,形成评价泥页岩力学脆性的方法；(3)通过分析矿物含量与弹性参数的关系以及岩石物理方法模拟,明确了石英和黄铁矿是泥页岩的脆性矿物,提出了利用矿物体积含量及每种矿物的脆性系数加权求和的矿物脆性评价方法；(4)利用灰色关联分析结果建立了等温吸附试验条件下的吸附气量测井解释模型,并利用吸附势原理将其校正为地层条件下页岩的吸附量；(5)筛选Simandoux方程计算页岩层系的含水饱和度,结合洗油前、后孔隙度的变化确定残余油饱和度,从而获得游离气的含气饱和度。
[Abstract]:The continental shale has obvious particularity compared with the marine shale in terms of sedimentary environment, source, mineral composition, organic matter type and thermal evolution degree, which is characterized by rapid transformation, silty interlayer development and high residual oil saturation. Therefore, the study of resource evaluation parameters is of great significance. On the basis of the standardization of the log data, the 7 segments of the land facies are divided into 7 segments, the stratigraphic structure frame is determined, the core description and test analysis data of the key wells are fully utilized, and the shale lithology, the organic carbon content, the gas and brittleness logging response characteristics are explored, and the optimization method is based on the theoretical discussion. The interpretation model of the key parameters of the evaluation of the 7 sections of the land facies shale gas is established, the distribution of key parameters in the vertical and the plane is revealed, and the favorable area of shale gas enrichment is predicted. It provides an important theoretical basis for the evaluation and further exploration of the land facies shale gas in the Ganquan Fuxian area. (1) the three dimensional rendezvous method is considered. The identification of long 7 sections of the complex lithology is better. The identified shale layer is 3.7 to 110.9m thick, and the thickest is near well FY2 and YY34. (2) the shale mineral composition is in turn clay minerals, feldspar, quartz, carbonate minerals and pyrite, and the organic carbon content is between 2% and 8%; (3) the shale is generally characterized by the mechanical characteristics of "elastic short plasticity". When the force is subjected to multiple horizontal splitting, the brittle shale is more developed in the Xia Temple Bay area, accounting for about 60% of the total shale thickness. (4) the single well analytical gas is 0.03 ~ 3.77cm3/g, the residual gas is 0.16-0.72cm3/g, the adsorption gas is mainly between 1.2 and 2.0cm3/g, and the shale adsorption capacity is higher in the lower shal Bay and the south area of the lower Temple Bay. The free gas saturation of the Bagua monastery Wang Zhuang Tai area and the southwest area of Xia Temple Bay town is high. (5) according to the characteristics analysis of the key parameters in the longitudinal direction of the single well and the spatial configuration relation, the favorable target of the long 7 section plane is predicted. The most favorable conditions are in the south of the bridge town, the Bagua temple and the tableland area. Evaluation methods: (1) in view of pure shale and silty shale, the method of multiple stepwise regression of sensitive log to explain organic carbon content is established respectively. (2) on the basis of analyzing the elastic and stress-strain characteristics of the shale, the pattern of rock fracture and the brittleness of the rock, the relationship between the shear wave time difference and the P-wave time difference and the density is fitted. The dynamic mechanical parameters are calculated and the dynamic mechanical parameters are calculated, and the dynamic and static parameters are carried out to form the method of evaluating the mechanical brittleness of shale. (3) by analyzing the relationship between the mineral content and the elastic parameters and the simulation of the rock physical method, it is clear that quartz and pyrite are brittle minerals of shale, and the utilization of ore is put forward. The mineral brittleness evaluation method of the volume content of the material and the weight of each mineral is weighted. (4) the adsorption gas logging interpretation model under the condition of isothermal adsorption test is established by using the grey correlation analysis results, and the adsorption capacity principle is used to correct the adsorption amount of the shale under the formation condition; (5) the Simandoux equation calculation page is screened. The water saturation of the strata is determined, and the residual oil saturation is determined by the change of porosity before and after washing oil, so that the gas saturation of free gas is obtained.
【学位授予单位】：西北大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：P618.13

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