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首页> 外文期刊>Marine and Petroleum Geology >Drilling hazard assessment for hydrate bearing sediments including drilling through the bottom-simulating reflectors
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Drilling hazard assessment for hydrate bearing sediments including drilling through the bottom-simulating reflectors

机译：含水合物沉积物的钻井危害评估，包括通过模拟底部的反射器进行钻井

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摘要

To achieve the scientific goals of the NGHP Expedition 01 project, it was necessary as a preliminary step to examine the available marine 2-D seismic data covering then-proposed investigation drilling sites for potential drilling geohazards. A total of 19 potential drilling sites, located in offshore areas of the northern Indian Ocean: the Krishna-Godavari Basin, the Kerala-Konkan Basin, the Mahanadi Basin, and the Andaman Islands, were investigated. The NGHP Expedition 01 staff identified several potential drilling hazards to be investigated at each site, including, but not limited to, the common drilling hazards of seafloor slopes and failure conditions, complex seafloor topography and anomalous amplitude response, shallow gas hydrates, shallow free gas, shallow water-flow, and faults/fractures. Specific proposed drilling sites were investigated over a depth range beginning at the seafloor and extending to 350-700 m below the seafloor, depending upon the specific planned depth at each site. These investigations resulted in some sites being interpreted to be clear of potential drilling geohazards, while other sites were determined to have potentials for specific geohazards significant enough for reconsideration. These reconsiderations consisted of moving specific sites to more favorable locations interpreted to be relatively unsusceptible or less susceptible to a specific identified geohazard, and/or reducing the planned depth of drilling, or removing a potential site at least temporarily from consideration. This work contributed to favorable results from the NGHP Expedition 01 in that no drilling geohazards were reportedly encountered. (C) 2014 Elsevier Ltd. All rights reserved.
机译：为了实现NGHP Expedition 01项目的科学目标，有必要作为一个初步步骤来检查可用的海洋2-D地震数据，该数据涵盖当时提议的勘测钻探场地是否存在潜在的钻探地质灾害。共调查了位于印度洋北部近海地区的19个潜在钻探地点：克里希纳-戈达瓦里盆地，喀拉拉邦-康坎盆地，马哈纳迪盆地和安达曼群岛。 NGHP Expedition 01工作人员确定了每个地点要调查的几种潜在钻探危险，包括但不限于海底坡度和破坏条件，复杂的海底地形和反常幅度响应，浅层天然气水合物，浅层游离气的常见钻井危害。 ，浅水流和断层/裂缝。根据每个地点的特定计划深度，在海底开始并延伸至海底以下350-700 m的深度范围内研究了拟议的特定钻探地点。这些调查导致一些站点被解释为没有潜在的钻探地质灾害，而其他站点被确定为具有潜在重大的潜在地质灾害，足以重新考虑。这些重新考虑包括将特定地点移至被认为相对较不敏感或较不易受特定已识别地质灾害影响的更有利地点，和/或减少计划的钻探深度，或至少暂时不考虑潜在地点。这项工作为NGHP Expedition 01提供了有利的结果，因为据报道没有遇到钻井地质灾害。 （C）2014 Elsevier Ltd.保留所有权利。

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