鄂尔多斯盆地中奥陶统马家沟组海相碳酸盐岩储集层特征^*   总被引：1，自引：0，他引：1       下载免费PDF全文

王起琮  赵淑萍  魏钦廉  肖玲  杨奕华  郭艳琴  牛苗宁 《古地理学报》2012,14(2):229-242

探讨了鄂尔多斯盆地中奥陶统马家沟组海相碳酸盐岩储集层岩石物理相特征及储集层分类方法。应用露头、岩心、薄片分析及储集层物性测试及压汞实验方法开展了碳酸盐岩储集层岩性、孔隙结构及物性研究,应用储集层流动带指标FZI开展了储集层岩石物理相特征及储集层分类方法研究。马家沟组碳酸盐岩储集层岩石类型主要为岩溶角砾泥晶—粉晶白云岩、膏盐溶蚀角砾泥晶—粉晶白云岩、含膏盐或膏盐质白云岩、粉晶—细晶白云岩、残余结构中晶—细晶及粗晶—中晶白云岩、次生灰岩、泥晶灰岩及白云岩,发育洞穴、溶洞、孔隙及裂缝4种储集空间,主要发育晶间孔型、裂缝型、裂缝—晶间孔型、裂缝—晶间孔—溶洞型4类储渗类型。依据流动带指标将储集层划分为6类岩石物理相及24类亚相,据此将储集层分为5类7亚类：一类储集层是天然气赋存的优质储集层,主要分布于马五₁、马五₄及马五₆段;二、三类储集层是马家沟组主要储集层类型,以孔隙为主的二₁、三₁类储集层主要分布于马五₁—马五₆段,以裂缝为主的二₂、三₂类储集层主要分布于马四段;四类储集层物性差,见于各段;五类为非储集层。研究结果表明,基于岩石物理相的储集层研究方法是揭示碳酸盐岩储集层特征及开展储集层定量分类与评价的有效途径。  相似文献   

Distinguishing oil and water layers by interpreting acoustic logging data with changing well diameters          下载免费PDF全文

Xueang Zhang  Zhuwen Wang 《Geophysical Prospecting》2015,63(3):669-679

During surveys, water layers may interfere with the detection of oil layers. In order to distinguish between oil and water layers, research on the properties of well diameters and oil and water layers and their relation to acoustic logging rules is essential. Using Hudson's crack theory, we simulated oil and water layers with different well diameters or crack parameters (angle and number density). We found that when the well radius increases from 0.03 m to 0.05 m, the variation ratio of compressional wave amplitude for the oil layer is less than that for the water layer. The difference of Stoneley wave amplitude between the crack parameters (angle and number density) is greater in the case of the water layer than in the case of the oil layer. The response sensitivity of wave energy is greater for the water layer than that for the oil layer. When the well radius increases from 0.05 m to 0.14 m, the maximum excitation intensity for oil layer is greater than that for the water layer. We conclude that the propagation of an elastic wave is affected by medium composition and well diameter, and the influence has certain regularity. These results can guide further reservoir logging field exploration work.  相似文献   

关于地震地下水观测井建设的若干问题     

车用太  鱼金子  朱成英 《内陆地震》2014,28(3):195-201

根据有关的国家与地震行业技术标准,结合建井的实践经验,论述了地震地下水观测井的定位、观测井结构设计与钻井施工的技术要求。  相似文献   

General well function for soil vapor extraction     

《Advances in water resources》2014

This paper develops a well function applicable to extraction of groundwater or soil vapor from a well under the most common field test conditions. The general well function (Perina and Lee, 2006) [12] is adapted to soil vapor extraction and constant head boundary at the top. For groundwater flow, the general well function now applies to an extraction well of finite diameter with uniform drawdown along the screen, finite-thickness skin, and partially penetrating an unconfined, confined, and leaky aquifer, or an aquifer underneath a reservoir. With a change of arguments, the model applies to soil vapor extraction from a vadose zone with no cover or with leaky cover at the ground surface. The extraction well can operate in specified drawdown (pressure for soil vapor) or specified flowrate mode. Frictional well loss is computed as flow-only dependent component of the drawdown inside the extraction well. In general case, the calculated flow distribution is not proportional to screen length for a multiscreen well.  相似文献   

观测井深度与井水位地震监测效能的关系     

张敏 《高原地震》2009,21(4):9-13

从井水位固体潮汐响应及同震响应等方面系统研究了不同观测含水层中观测井的深度对地震监测效能的影响问题,并讨论了影响监测能力的其他因素,提出了理想的观测井深度。  相似文献   

Shape factor in the drawdown solution for well testing of dual-porosity systems     

Hassan Hassanzadeh  Mehran Pooladi-Darvish  Shahram Atabay 《Advances in water resources》2009,32(11):1652-1663

One of the important parameters in existing commercial dual-porosity reservoir simulators is matrix–fracture shape factor, which is customarily obtained by assuming a constant pressure at the matrix–fracture boundary. In his work, Chang [1] and [2] addressed the impact of boundary conditions at the matrix–fracture interface and presented analytical solutions for the transient shape factor and showed that for a slab-shaped matrix block a constant pressure boundary condition leads to an asymptotic (long-time) shape factor of π²/L², and that a constant volumetric flux leads to an asymptotic shape factor of 12/L². In a recent paper [3], we reconfirmed Chang’s [1] and [2] results using a Laplace transform approach. In this study, we extend our previous analysis and use infinite-acting radial and linear dual-porosity models, where the boundary condition is chosen at the wellbore, as opposed to at the matrix boundary. The coupled equations for fracture and matrix are solved analytically, taking into account the transient exchange between matrix and fracture. The analytical solution that invokes the time dependency of fracture boundary condition under constant rate is then used to calculate the transient shape factors. It is shown that, for a well producing at constant rate from a naturally fractured reservoir, the appropriate value of stabilized shape factor is 12/L². This contrasts with the commonly used shape factor for a slab-shaped matrix block that is subject to a constant pressure boundary condition, which is π²/L². The errors in the matrix–fracture exchange term in a dual-porosity model associated with the use of a shape factor derived based on constant pressure boundary condition at the matrix boundary are then evaluated.  相似文献   

“松科二井”邻域岩石圈精细结构特征及动力学环境——深地震反射剖面的揭示   总被引：2，自引：0，他引：2       下载免费PDF全文

符伟  侯贺晟  高锐  刘财  杨瑨  国瑞 《地球物理学报》2019,62(4):1349-1361

为揭示"松科二井"邻域岩石圈精细结构特征,布设了一条过井近南北向的深地震反射剖面,采用多尺度药量结合的激发技术,长排列、重点段加密接收高次覆盖的采集方式,通过高保真、高保幅的处理流程获得高分辨率、高信噪比的叠前时间偏移剖面.结果显示:T4反射轴之下沉积岩层状反射与火成岩杂乱反射相间,有两处疑似上古生界地层,分别位于松科二井下方(双程走时,Two way travel time,TWT,3.5～4s)和任民—永安断隆下方(CDP,3500～4500,TWT,3～4s);中下地壳可观察到近平行的北倾反射,中和断陷下方存在上下关联的透镜状强反射,整体轮廓呈蘑菇云状,解释其为岩石圈伸展构造中发育的深部热流底辟体;北部莫霍面呈近水平连续强反射,南部徐家围子断陷区域莫霍面反射较弱,同时剖面上存在3种明显的岩石圈上地幔反射,包括倾斜地幔反射、近水平地幔反射和超深地幔反射,推断其分别为早期俯冲遗迹、早期增厚地壳底界面以及现今岩石圈底界面.本文利用过松科二井地震剖面的最新成果,揭示出古亚洲洋、蒙古—鄂霍茨克洋和古太平洋三大构造域先后作用下,保留在松嫩地块岩石圈内的结构特征,为探讨松辽盆地形成原因、构造背景及动力学因素提供新视野.  相似文献   

2019年长宁M6.0和2018年兴文M5.7地震引起的井水位同震响应对比分析     

向阳  孙小龙  杨朋涛  张磊  巩浩波 《地震》2020,40(2):155-165

2019年长宁M6.0地震和2018年兴文M5.7地震引起了华蓥山断裂及其附近区域8口观测井水位不同程度的响应变化。 本文对比分析各观测井水位的同震响应特征, 从地震波能量密度、 同震破裂体应变、 含水层渗透性参数变化以及断裂带控制作用几个方面探讨了其同震响应机理。 结果显示, 井水位同震响应的幅度与地震波能量密度有一定关系; 2019年长宁M6.0地震引起的井水位同震响应形态符合同震破裂体应变四象限空间分布特征, 但2018年兴文M5.7地震则不符合; 两次地震引起的含水层渗透性参数变化存在空间上的不一致性和单点各向异性, 并且断裂带自身的水文条件对井水位同震响应形态和幅度有一定的控制作用。 综合分析认为, 目前已有的几种机理无法完全解释两次地震引起的井水位同震响应现象。  相似文献   

开展小极距井下地电阻率观测的可行性分析   总被引：2，自引：2，他引：0  

解滔  于晨  卢军 《中国地震》2019,35(1):14-24

目前,我国用于地震监测的地电阻率观测面临着两个难题:①测区范围较大导致台网稀疏且分布不均匀;②易受环境干扰。本文结合台站实际的地下电性结构,采用地电阻率解析表达式和有限元数值分析方法,对开展小极距井下地电阻率观测的可行性进行了讨论。结果表明:小极距井下观测方式能有效抑制地表电性异常体类干扰和年变化的影响,也能记录到地表大极距观测和井下大极距观测所能记录到的震前异常变化。小极距井下观测能大幅减小布极区范围,有助于地电阻率的足密度组网成场观测,可为解决目前地电阻率观测面临的难题提供一种可选方案。  相似文献   

辽宁本溪牛毛岭马家沟组顶部剖面的成岩作用          下载免费PDF全文

孙宝亮  梁俊红  温守钦  崔卫利 《地质找矿论丛》2023,38(2):177-184

本文以阴极发光为主要研究手段，通过胶结物形态和结构以及接触关系的观察，对本溪市牛毛岭马家沟组顶部剖面成岩作用进行研究，重建成岩历史和孔隙演化过程。研究结果表明，该剖面成岩作用主要包括机械压实、胶结、白云岩化、溶蚀、早期破裂作用；同生成岩阶段的成岩作用多样：分层(1)、(2)和(5)经受较强压实作用，分层(3)—(5)白云岩化特征符合回流渗透模式，分层(4)由于溶蚀形成溶塌角砾；早成岩阶段主要为胶结作用，主要发生于浅埋藏环境：分层(1)的掘穴和破裂等大孔隙被铁方解石充填，分层(3)—(5)中晶间孔隙、小窗状孔隙、溶塌裂缝、硬石膏晶体铸模等孔隙被白云石充填；中、晚成岩阶段的成岩作用很少。该剖面的成岩作用主要发生在同生—早成岩阶段，这与鄂尔多斯盆地中部中奥陶统埋藏史相似。  相似文献