IOCAS-IR  > 海洋地质与环境重点实验室
Increasing the accuracy of estimated porosity and saturation for gas hydrate reservoir by integrating geostatistical inversion and lithofacies constraints
Wang, Xiujuan1,2,3,4,5; Liu, Bo1,2,5; Jin, Jiapeng1,2,5; Lu, Jingan6; Zhou, Jilin1,2,5; Qian, Jin1,2,3,4; Wu, Nengyou3,7
2020-05-01
Source PublicationMARINE AND PETROLEUM GEOLOGY
ISSN0264-8172
Volume115Pages:11
Corresponding AuthorWang, Xiujuan(wangxiujuan@qdio.ac.cn)
AbstractPorosity, saturation, thickness of gas hydrate-bearing layers and their spatial distributions are key factors for production tests. The gas hydrate-bearing layers ranging from a few to tens of meters thickness are confirmed by Logging While Drilling (LWD) data and core samples at Sites W11 and SC-03, in the Shenhu area, South China Sea. Gas hydrate-bearing layers of two wells (about 200 m) show that not all layers exhibit good lateral continuity. Several thin layers (similar to 4 m) with low gas hydrate saturations (15-20% of the pore space) or non-gas hydrate are laterally discontinuous. The interbedding of gas hydrate-bearing and non-hydrate layers with different saturations, thickness and random distribution cause the heterogeneities in the reservoir. The gas hydrate saturation and distribution inverted from deterministic and traditional geostatistical inversion have high uncertainties due to the limitations of the empirical relationship and probability density functions (PDFs). A better understanding of spatial distribution and saturation for each gas hydrate layer is useful to build a realistic net hydrate pay and resource estimation. In this study, we first divide gas hydrate saturations, porosity, acoustic impedance into low and high values based on the estimated LWD results, which is call as lithofacies. Then, we propose to create multivariate PDFs by lithofacies constraints. The acoustic impedance, saturation, thickness, porosity of gas hydrate-bearing layers and non-gas hydrate layers are inverted by displaying geostatistical inversion with lithofacies constraint. We found the spatial variations and heterogeneous distributions with a thickness ranging from 4 to 35 m and the laminated gas hydrate layers with saturations ranging from 10% to 40% are clearly shown from seismic data, which are useful for the horizontal well development method of a hydrate production test.
KeywordGas hydrate Heterogeneous distribution Geostatistical inversion Lithofacies Production test
DOI10.1016/j.marpetgeo.2020.104298
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2017YFC0307601] ; National Natural Science Foundation of China[41676041] ; National Natural Science Foundation of China[41976077]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000519654400031
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/165838
Collection海洋地质与环境重点实验室
Corresponding AuthorWang, Xiujuan
Affiliation1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
2.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China
4.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
6.MNR, Guangzhou Marine Geol Survey, Guangzhou 510760, Peoples R China
7.MNR, Lab Gas Hydrate, Qingdao Inst Marine Geol, Qingdao 266071, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wang, Xiujuan,Liu, Bo,Jin, Jiapeng,et al. Increasing the accuracy of estimated porosity and saturation for gas hydrate reservoir by integrating geostatistical inversion and lithofacies constraints[J]. MARINE AND PETROLEUM GEOLOGY,2020,115:11.
APA Wang, Xiujuan.,Liu, Bo.,Jin, Jiapeng.,Lu, Jingan.,Zhou, Jilin.,...&Wu, Nengyou.(2020).Increasing the accuracy of estimated porosity and saturation for gas hydrate reservoir by integrating geostatistical inversion and lithofacies constraints.MARINE AND PETROLEUM GEOLOGY,115,11.
MLA Wang, Xiujuan,et al."Increasing the accuracy of estimated porosity and saturation for gas hydrate reservoir by integrating geostatistical inversion and lithofacies constraints".MARINE AND PETROLEUM GEOLOGY 115(2020):11.
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