苏北盆地泰州组砂岩成岩序列和储集层质量主控因素分析?   总被引：3，自引：1，他引：2       下载免费PDF全文

朱筱敏  刘长利  张亚雄  刘为付  陈莉琼  王文军  杨立干 《古地理学报》2008,10(5):439-446

基于53口井310余块储集层砂岩样品的分析研究,指出泰州组储集层存在着压实(压溶)、胶结和溶蚀等成岩作用,但在不同位置成岩作用的表现有所不同。海安凹陷以胶结和溶蚀作用为主,压实与压溶作用不太明显;高邮凹陷的压实程度较海安凹陷强烈。压实作用使得高邮凹陷泰州组储集层孔隙度在2 400～2 800 m处于10%左右,而海安凹陷为10%～20%。海安凹陷和高邮凹陷泰州组储集层目前处于中成岩阶段A期。储集层质量主要受原始沉积环境和成岩作用的综合影响。压实作用和胶结作用均可降低孔隙,但当碳酸盐胶结物含量小于15％时,胶结作用对储集层质量影响较小。碳酸盐胶结物和长石颗粒溶蚀形成了大量的粒间溶孔。海安凹陷有利储集层主要分布在西北部和东部三角洲前缘砂体和滑塌浊积扇砂体中,高邮凹陷有利储集层主要分布在南部扇三角洲前缘砂体中。  相似文献   

双作用水泵泡沫增压装置应用及前景分析   总被引：1，自引：0，他引：1  

彭新明  刘大军  柴尔慧  朱继东  孙友宏 《吉林大学学报(地球科学版)》2008,38(4)

双作用水泵泡沫增压装置是利用双缸双作用水泵的高压能力将低压空气和泡沫液二次增压至水泵的额定压力,并混合产生泡沫.采用BWZ-1200双作用水泵泡沫增压装置在北京地区深度为1 000 m以下的地热井钻探中,成功地克服了地热井钻进中井内漏失和洗井的难题;在极度缺水的宁夏南部地区水井钻探中,采用BWZ-1100双作用水泵泡沫增压装置解决了水井孔内严重漏失和施工用水的难题.该装置可代替价格昂贵的高压空压机实现气举反循环钻探,应用于深地热井、深水井和油气井钻探.  相似文献   

洞穴完井工艺在寿阳地区煤层气钻井中的应用   总被引：4，自引：0，他引：4  

黄勇  熊涛 《中国煤炭地质》2008,20(2):61-64

洞穴完井工艺包括钻井、完井、排水采气等工序,为提高煤层渗透率,最大限度的保证煤层气解析与运移,洞穴完井一般要求有效井径3-4m,及一定范围的破碎带。远东能源公司为开采寿阳地区15#煤层中的煤层气,部署了4口生产井．其井身设计为三开结构。钻井主要设备为T685WS顶驱车载钻机及多台不同型号的空压机,采用潜孔锤冲击钻进．以空气、空气泡沫为冲洗介质,钻进至15#目标煤层底板以下46m处完钻,然后利用可伸缩式扩孔器进行扩孔。在扩孔至距三开井底8～10m时．开始采用空气和清水憋压,通过瞬间释放压力,使煤层坍塌,如此反复,至造穴直径达到要求。由于严格按照技术标准及操作流程作业,采取的技术措施合理,4口井均已顺利投入生产,增产效果显著。可见该种洞穴完井技术的应用,不仅可以保护煤层原生结构及环境,并且还能减少煤层气射孔、压裂等环节的费用．对于煤层气井施工具有重要的经济意义。  相似文献   

煤层气固井声幅测井方法探讨     

孟予萍  郭祥云 《中国煤炭地质》2008,(12):12-13

影响煤层气固井声幅测井的因素较多,如地层软硬变化大、套管内径或壁厚不均、仪器不居中、发射能量不足、接收灵敏度不够等,这些因素的存在将会导致首波丢失、时差曲线产生周波跳跃或波动现象。为提高煤层气固井声幅测井质量,要尽量保证所用仪器外径接近套管内径,以减少无效传播和能量损失,另外需提高仪器的发射能量及接收灵敏度;在自由套管和声波强吸收地层,必须保证自由套管首波不限幅、声波强吸收地层首波不丢失。在现场解释时,一般以＂自由套管＂处的偏转幅度值A为标准,将固井声幅曲线幅度的20%A和40%A作为分界点,评价固井效果。  相似文献   

基于城市地质质量研究     

徐连利 《中国煤炭地质》2008,(7):19-22

将安全、和谐、环境、经济和是否占有资源等指标作为评价城市地质质量的5个因子,并以河南省郑州、平顶山、焦作、鹤壁四个主要城市为例,在调查分析了城市存在的自然地质因素（地质构造、岩土）和人为活动影响次生因素等主要问题基础上,建立起自然地质因素、人为次生因素等与5个评价因子之间的逻辑联系;根据地质因素对城市因子的影响程度的轻重,进行专家赋值判别运算,采用层次分析法（AHP））进行权重分析,对四个城市的城市地质质量进行了评估。结果认为Z-Ⅰ、Z-Ⅱ、J-Ⅱ、H-Ⅰ、H-Ⅱ、P—Ⅱ、P—Ⅲ、H—Ⅲ等区良好以上,适宜城市可持续发展;P—Ⅰ、H-Ⅳ等区质量不高,存在问题较多,应在城市建设发展中引起注意。同时指出城市地质是城市发展中的一个重要的基本因素,城市的建设、可持续发展方案的制定需要关注城市地质质量、依赖城市地质。  相似文献   

第二次土地调查若干问题探讨   总被引：1，自引：0，他引：1  

杨卫国 《现代测绘》2008,31(4)

第二次土地调查的目的是全面查清全国土地利用状况,掌握真实的土地基础数据,如何保证调查的质量?文章以江阴市为例进行探讨。  相似文献   

城市大比例尺航测成图质量评定     

胡景海  钟生伟 《地理空间信息》2008,6(1):121-123

主要从大比例尺航测成图质量评定角度出发,提出了既要满足相应规范和用户要求,又要最大限度的发挥航测成图的优势,对产品质量做出公正、客观、正确的质量评价方法。  相似文献   

200～300N高强度合成金刚石及其在钻探中的应用          下载免费PDF全文

方啸虎  张龙 《探矿工程》1996,(4):38-40

对会“打滑”地层,国内外均为难题,新研究的技术是：（１）用特殊的新构思,运用内设备,压制出可批量２供应的高强度金刚石,这种高强度金刚石可承受比目前高得多的钻压;（２）运用强力钻进的配套技术,用上述高强度金刚石制作头。  相似文献   

Influence of karst hydrology on water quality management in southeast South Australia     

A. J. Emmett  A. L. Telfer 《Environmental Geology》1994,23(2):149-155

Southeast South Australia has large reserves of potable groundwater, generally close to the surface. European settlement has had a major impact on groundwater quality due to the presence of extensive karst in the unconfined aquifer. Historically, industries such as cheese factories were often sited close to karst features (e.g. caves and sinkholes) because they provided a convenient means of waste disposal. Although most have long since closed, they have left a legacy of pollution plumes of varying sizes. In Mount Gambier, the main regional centre, the presence of both exposed and subterranean karst features provided a perfect system for the disposal of stormwater. Prior to the provision of a sewerage system within Mount Gambier, all toilet and household wastewaters were disposed to ground. These activities and the subsequent problems that began emerging in the 1960s have led to a concerted effort over the last 20 years to change the philosophy of waste disposal and to generate an understanding and responsibility by those who live in the region and depend on groundwater for the major part of their water supply. Mount Gambier's water supply comes from the Blue Lake. Groundwater inflow from a highly karstic Tertiary limestone aquifer provides 90% of the recharge to the Blue Lake. The lake is a high-value resource in a high-risk environment and in order to minimize this risk, a water-quality management plan for the lake is currently being developed.  相似文献   

An evaluation of residential air radon concentrations and related variables in southeast Michigan,USA     

L. G. Kodosky 《Environmental Geology》1994,23(1):65-72

Analysis of 153 residential air radon (Rn-222) screening measurements from southeast Michigan indicates that basements host Rn levels two to three times higher than upper-level rooms. Compared to unfinished basements, finished (e.g., paneled walls, tiled floors) basements apparently reduce indoor air Rn levels while partially finished basements may not. Factor analysis of residence questionnaire data explains 59 percent of the Rn data variance. The volume of pathways (e.g., foundation cracks/holes, uncapped sumps) allowing Rn seepage into the dwelling controls the largest portion, 23 percent, of the explained data variance. The residence water source explains 11 percent of the Rn data variance. Groundwater Rn levels contribute to the air Rn data variability, but the study data cannot quantitatively assess this contribution. Seven percent of the Rn data variance is likely controlled by house depressurization facilitated by residence structural properties. Residences with foundation cracks or poorly sealed joints and low-volume indoor-outdoor air exchange are more prone to this effect. Eighteen percent of the explained Rn data variance correlates with the residence's primary heat source. Evidently, operating combustion sources also induce house depressurization and allow Rn to be drawn into the house through entry paths. Twenty-four percent of the analyses equal or exceed 4 pCi/1 Rn. In residences occupied 5 years by the same individuals, 17 percent of the Rn data are 4 pCi/l; here the arithmetic mean air Rn level is 8.3 pCi/l and the average occupancy period 17.4 years.  相似文献