单波束测深技术在海底管道检测中应用   总被引：1，自引：0，他引：1  

来向华  潘国富  傅晓明  苟诤慷  陈云敏 《海洋工程》2007,25(4):66-72

为查明海底管道的位置和掩埋状态,在海底管道检测中使用了单波束测深技术。对探测过程中海底管道的声波反射特征和解释方法进行了研究,研究结果表明,浅水时反射曲线更能反映管道的真实形态;深水时无论是绕射曲线还是反射曲线均与管道的真实形态有较大差异。波束角会严重影响单波束对海底管道的探测能力。通过对测量记录的分析,可对海底管道的位置、埋设深度和是否发生悬空等状况进行判断。  相似文献   

碳酸盐岩表生岩溶与埋藏溶蚀比较——以塔北和塔中地区为例   总被引：11，自引：0，他引：11  

钱一雄  邹森林  尤东华  王蓉英 《海相油气地质》2007,12(2):1-7

表生岩溶与埋藏溶蚀是碳酸盐岩储层发育的最重要成岩作用,两者受岩石等内在因素的影响基本相同,但所受的外部主控因素差异显著。表生岩溶受构造不整合面、古构造等影响较大;埋藏溶蚀主要受断裂与深部流体控制。表生岩溶主要表现为垂向分带性明显的复杂孔洞缝网络结构,而埋藏溶蚀主要呈受断裂—裂隙控制的“V”形洞穴样式或与断裂有关的阶梯状分布。表生岩溶发育一些标型特征,如钙质壳,古土壤,铝土矿,淡红色方解石晶体,溶蚀沟、坑、天坑,新月形状、悬垂和纤维状渗滤砂或胶结物,岩溶角砾及与地下暗河有关的机械流水沉积;埋藏溶蚀往往发育与中低温热液有关的异形铁白云石、萤石、闪锌矿、磁黄铁矿等密西西比河谷型矿物以及塌陷构造、裂隙结构、不规则的角砾(化)岩体等。塔里木盆地塔北地区主要发育表生岩溶作用;塔中地区西北部不具备发育大规模表生岩溶的地质条件,以发育埋藏溶蚀作用为主。  相似文献   

Undersea Buried Pipeline Reconstruction Based on the Level Set and Inverse Multiquadric Regularization Method     

SHANG Wenjing  XUE Wei  XU Yidong  MAKAROV Sergey B.  LI Yingsong 《中国海洋大学学报(英文版)》2022,21(1):101-112

The electric inversion technique reconstructs the subsurface medium distribution from acquired data. On the basis of electric inversion, objects buried under the earth or seabed, such as pipelines and unexploded ordnance, are detected and located in a contactless manner. However, the process of accurately reconstructing the shape of the target object is challenging because electric inversion is a nonlinear and ill-posed problem. In this work, we present an inverse multiquadric (IMQ) regularization method based on the level set function for reconstructing buried pipelines. In the case of locating underwater objects, the unknown inversion area is split into two parts, the background and the pipeline with known conductivity. The geometry of the pipeline is represented based on the level set function for achieving a noiseless inversion image. To obtain a binary image, the IMQ is used as the regularization term, which 'pushes' the level set function away from 0. We also provide an appropriate method to select the bandwidth and regularization pa-rameters for the IMQ regularization term, resulting in reconstructed images with sharp edges. The simulation results and analysis show that the proposed method performs better than classical inversion methods.  相似文献   

浅谈2.5D磁法反演估算铁矿资源量的多解性          下载免费PDF全文

李土雄  马兆同  赵法强 《山东国土资源》2011,27(7):34-38

2.5D磁法反演估算铁矿资源量,关键是在垂直磁异常走向上求拟合模型的截面积。该文利用一种常见模型拟合4种实测磁场,发现铁矿截面积与埋深和磁性大小有一定的规律:磁化强度一定时,截面积与埋深呈线性正相关;埋深一定时,截面积与磁化强度呈近似指数形式的反相关。固定深部或外围磁性体参数,单独考虑浅部或中间铁矿模型时也有这种规律。在无钻孔资料及磁性资料不清楚时,磁化强度100 000×10-3~150 000×10-3A/m为估算铁矿资源量的最佳磁参数。因磁法反演的多解性,此类方法适用于钻孔验证前的资源量估计。  相似文献