当前位置: X-MOL 学术Explor. Geophys. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Comparison of logging-while-drilling and wireline logging data from gas hydrate-bearing deep-sea sediments, the Ulleung Basin, East Sea
Exploration Geophysics ( IF 0.9 ) Pub Date : 2021-03-10 , DOI: 10.1080/08123985.2021.1898942
Gil Young Kim 1 , Boyeon Yi 1 , Nyeon Keon Kang 1 , Dong-Geun Yoo 1 , Joo Yong Lee 1
Affiliation  

Gas hydrate exploration was conducted using logging-while-drilling (LWD) and wireline logging (WLL) at two sites (UBGH2-6 and UBGH2-10) in the Ulleung Basin, East Sea (Sea of Japan). Coring for gas hydrate sampling was also conducted. Seismic profiles revealed that the upper layers at the logged sites (∼180 m at UBGH2-6 and ∼150 m at UBGH2-10) are dominated by turbidite/hemipelagic sediments, whereas the lower-lying sediments are characterised by thick mass transport deposits. Except in the gas hydrate-bearing interval (140–160 metres below the seafloor) of UBGH2-6, the WLL velocity and resistivity data are a little higher (∼100 m/s and ∼0.4 ohm-m, respectively) than those indicated by LWD. Conversely, the density and porosity do not show a consistent pattern for the two methods. Discrepancies between LWD and WLL can be caused by the methodology, borehole condition, and gas hydrate occurrence type. The high resistivity values (∼100 ohm-m) in the gas hydrate-bearing zone of UBGH2-6 are typical of inclined fracture-filling gas hydrate. In this case, the LWD resistivity may be overestimated as a result of the data acquisition principle. The relationships between the physical properties are significantly controlled by the presence of gas hydrate. Therefore, in fracture-filling gas hydrate-bearing sediments, the WLL resistivity data are more reasonable than the LWD resistivity data. Both methods have advantages and disadvantages in terms of data quality, efficiency, and resolution. Therefore, it is necessary to compare and interpret data measured using both methods to identify the physical properties of gas hydrate-bearing sediments.



中文翻译:

东海郁陵盆地含天然气水合物深海沉积物随钻测井和电缆测井数据的比较

在东海郁陵盆地(日本海)的两个地点(UBGH2-6 和 UBGH2-10)使用随钻测井(LWD)和电缆测井(WLL)进行天然气水合物勘探。还进行了天然气水合物取样的取芯。地震剖面显示,测井地点的上层(UBGH2-6 处~180 m,UBGH2-10 处~150 m)以浊积岩/半远洋沉积物为主,而下层沉积物则以厚厚的质量输送沉积物为特征。除了在 UBGH2-6 的含天然气水合物层段(海底以下 140-160 米),WLL 速度和电阻率数据略高于(分别为~100 m/s 和~0.4 ohm-m)。随钻测井。相反,这两种方法的密度和孔隙率并没有显示出一致的模式。LWD 和 WLL 之间的差异可能是由该方法引起的,钻孔条件和天然气水合物赋存类型。UBGH2-6天然气水合物带的高电阻率值(~100 ohm-m)是典型的倾斜裂缝充填天然气水合物。在这种情况下,由于数据采集原理,随钻测井电阻率可能被高估。气体水合物的存在显着控制了物理性质之间的关系。因此,在裂缝充填天然气水合物沉积物中,WLL 电阻率数据比 LWD 电阻率数据更合理。两种方法在数据质量、效率和分辨率方面各有优缺点。因此,有必要对使用这两种方法测量的数据进行比较和解释,以识别含天然气水合物沉积物的物理性质。UBGH2-6天然气水合物带的高电阻率值(~100 ohm-m)是典型的倾斜裂缝充填天然气水合物。在这种情况下,由于数据采集原理,随钻测井电阻率可能被高估。气体水合物的存在显着控制了物理性质之间的关系。因此,在裂缝充填天然气水合物沉积物中,WLL 电阻率数据比 LWD 电阻率数据更合理。两种方法在数据质量、效率和分辨率方面各有优缺点。因此,有必要对使用这两种方法测量的数据进行比较和解释,以识别含天然气水合物沉积物的物理性质。UBGH2-6天然气水合物带的高电阻率值(~100 ohm-m)是典型的倾斜裂缝充填天然气水合物。在这种情况下,由于数据采集原理,随钻测井电阻率可能被高估。气体水合物的存在显着控制了物理性质之间的关系。因此,在裂缝充填天然气水合物沉积物中,WLL 电阻率数据比 LWD 电阻率数据更合理。两种方法在数据质量、效率和分辨率方面各有优缺点。因此,有必要对使用这两种方法测量的数据进行比较和解释,以识别含天然气水合物沉积物的物理性质。

更新日期:2021-03-10
down
wechat
bug