利用测井和地震资料分析木里盆地天然气水合物形成特征  

Analysis of natural gas hydrate formation characteristics of Muli basin using seismic and logging data

作　　者：张宝强 于常青[4] 谈顺佳[5] 范柱国 范国玮[3,4] 

机构地区：[1]陕西地建土地工程技术研究院有限责任公司,西安710075 [2]国土资源部退化及未利用土地整治工程重点实验室,西安710075 [3]昆明理工大学,国土资源工程学院,昆明650000 [4]中国地质科学院地质研究所,北京100037 [5]劳雷工业有限公司,北京100020

出　　处：《地球物理学进展》2018年第1期311-318,共8页Progress in Geophysics

基　　金：中国地质调查局“冻土带水合物专项”(GZHL20110313); 神华青海能源开发有限责任公司“青海省天峻县聚乎更煤矿区三露天天然气水合物调查评价”项目(SHQHNY201307001)联合资助.致谢 感谢中国地质科学院地质研所老师和同学的指导与帮助,感谢评审老师在百忙之中对本文的评审与指导!

摘　　要：天然气水合物产于海底沉积物和陆上永久冻土带中.祁连山木里盆地位于青藏高原北部,该地区属于永久冻土带,是形成天然气水合物的理想区域.关于冻土带天然气水合物的研究,国外起步较早,并取得了一定的研究成果;而国内研究较晚,大多是借鉴国外的研究方法,虽然也获得了部分成果,终归还是没有形成一套适合国内地质情况的、比较成熟的方法.在满足一定温压条件和其他因素时,构造等地质作用对沉积矿产天然气水合物的形成具有重要影响.本文根据研究区的地质特征和地形地貌等,结合测井资料及三维地震探测所得地震资料,分析木里盆地深部地质结构和构造情况,研究该区天然气水合物存在与构造的关系.木里盆地天然气水合物或解析气主要贮存在泥岩裂隙及砂岩层中,且在其出现的层段,密度、速度(相对围岩)等地球物理属性出现了降低.利用三维地震剖面进行的构造分析表明,该地区断裂发育且以逆断层为主.该区构造控制着水合物的形成和贮存,构造和水合物形成之间存在着必然联系,水合物异常区都位于构造较为发育的地方.Natural gas hydrate is produced in seabed sediments and permafrost on land. Muli basin is located in the northern Tibetan Plateau. This region covered by permafrost is an ideal area for natural gas hydrate to form. The study of natural gas hydrate started earlier in foreign countries,and some results has been achieved.However,this research started late in China,most of which just referring to foreign research methods,Although the corresponding results have been achieved,but it has not formed suitable and mature methods for the geological conditions in China. geologic process,especially tectonics has an important influence on the formation of sedimentary mineral resources,especially natural gas hydrate which need to meet certain temperature and pressure conditions and other factors. According to the characteristic of geology and geomorphology in the study area,combined with logging data and seismic data of 3D seismic exploration,we analyzed the geological structure and tectonic situation in the deep Muli basin,and studied the relationship between the existence of natural gas hydrate and tectonic setting in this region. In Muli basin,natural gas hydrate or gas mainly exist in cracks of mudstone and sandstone layer,and the geophysical properties such as density, seismic velocity（ relative to the surrounding rock） is decreased. The structural analysis based on 3D seismic profiles shows that the faults in this area are mainly dominated by reverse faults. Fracture especially thrust fault developed in this area. The geological structure in this area controls the formation and storage of hydrate,and there is an inevitable connection between the formation of hydrate and the geological structure. The abnormal area of hydrate is located in the place where the structure is more developed.

关 键 词：天燃气水合物 测井资料分析 地震勘探 构造 

分 类 号：P631[天文地球—地质矿产勘探]