渝东北CK地区页岩气地质调查测井评价技术研究

发布时间：2018-05-04 06:24

本文选题：渝东北 + 页岩气　；参考：《成都理工大学》2015年硕士论文

【摘要】：目前国内页岩气还处于先期探索阶段,不同地区页岩气评价标准各不相同。与常规油气藏相比,由于页岩气藏的成藏特征不同,导致了其地球物理特征也不同,这就增加了利用测井技术识别页岩气储层的难度。另外,由于针对各种复杂岩性识别的成像测井和井壁取芯方法成本较高、耗时较长、不能普及到每个地质调查井中。因此,常规测井系列需要提高识别和评价页岩气储层的精度。本文从矿物组分、储层物性、地化参数和含气量等方面,建立了针对渝东北CK地区CD4井下寒武统水井沱组页岩气地层的测井评价方法。(1)以补偿中子和声波时差为基础建立泥质含量模型,选用三孔隙度曲线建立砂质含量、灰质含量模型;(2)选用中子—密度交会法确定有效孔隙度,采用Timur理论公式计算渗透率;(3)建立了以补偿密度和声波时差为基础的TOC模型;(4)以朗格缪尔模型为基础,考虑温度、压力及TOC影响,计算吸附气和游离气含量。开展大量工作,取得如下几方面的成果与认识:1、总结了该井下寒武统水井沱组优质页岩气储层的测井响应特征:(1)自然伽马响应特征值总体较高,在断层破碎带显示为异常高值;(2)声波时差值相对较高,且伴随地层裂缝发育出现周波跳跃现象;(3)补偿中子值显示为高值;(4)侧向电阻率显示为中高值,高含气饱和度导致高侧向电阻率,但裂缝发育充水会使侧向电阻率略降低;(5)由于干酪根的密度值较低,因此页岩气储层补偿密度值较低。2、建立了岩性识别图版。根据图版可以有效识别泥页岩、灰岩和白云岩等不同颗粒直径的岩性。3、建立了相关性和拟合度较高的矿物组分模型、TOC模型。和实验分析的岩心资料相比,模型拟合度较高、误差值较小。4、根据改进的朗格缪尔模型和地层的含气饱和度、有效孔隙度、地层温度和压力等参数建立了吸附气和游离气的计算模型。CD4井全井以吸附气为主,总含气量随深度增加而增加。5、建立了页岩气流体识别模板。该模板以TOC为基础,根据不同页岩气储层物性参数,有效识别和评价了CD4井页岩气优质储层。
[Abstract]:At present, the domestic shale gas is still in the early stage of exploration, and the criteria for shale gas evaluation vary from region to region. Compared with conventional oil and gas reservoirs, the geophysical characteristics of shale gas reservoirs are different due to their different reservoir forming characteristics, which makes it more difficult to identify shale gas reservoirs by logging technology. In addition, the imaging logging and sidewall coring methods for complex lithology identification are expensive and time-consuming, so they can not be popularized in every geological survey well. Therefore, conventional logging series need to improve the accuracy of identifying and evaluating shale gas reservoirs. In this paper, from the mineral composition, reservoir physical properties, geochemical parameters and gas content and other aspects, The logging evaluation method of CD4 downhole Cambrian Shuituo formation shale gas formation in CK area of northeast Chongqing was established. The shale content model was established on the basis of compensating neutron and acoustic time difference, and the three porosity curve was used to establish sand content. In this paper, the effective porosity is determined by the neutron-density intersection method, and the permeability is calculated by the Timur formula. The TOC model is established based on the compensation density and acoustic time difference.) the Langmuir model is used as the basis and the temperature is taken into account. The contents of adsorption gas and free gas were calculated under the influence of pressure and TOC. A great deal of work has been carried out, and the following achievements and understandings have been obtained. The logging response characteristics of the well logging response of the well quality shale gas reservoir of the Shaituo formation of the Cambrian series, the natural gamma response characteristic value, are generally high. The difference of acoustic wave in fault fracture zone is relatively high, and the Zhou Bo jump phenomenon appears along with the formation fracture development. The compensated neutron value is shown to be high value and the lateral resistivity is shown to be medium and high value. High gas saturation results in high lateral resistivity, but the lateral resistivity is slightly reduced by water filling during fracture development.) because of the low density of kerogen, the compensation density value of shale gas reservoir is lower than that of shale gas reservoir, and the lithologic identification chart is established. Based on the lithology of shale, limestone and dolomite with different particle diameters, the TOC model of mineral components with high correlation and fitness was established. Compared with the core data analyzed by experiment, the model has higher fitting degree and smaller error value .4.According to the modified Langmuir model and the gas saturation and effective porosity of the formation, The calculation model of adsorbed gas and free gas is established. The whole well of CD4 well is dominated by adsorbed gas, and the total gas content increases with the increase of depth. A shale gas body identification template is established. Based on TOC, the high quality shale gas reservoirs in CD4 well are effectively identified and evaluated according to the physical parameters of different shale gas reservoirs.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.81

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