Increasing the accuracy of estimated porosity and saturation for gas hydrate reservoir by integrating geostatistical inversion and lithofacies constraints

doi:10.1016/j.marpetgeo.2020.104298

CORC > 海洋研究所 > 中国科学院海洋研究所 > 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, Xiujuan 1,2,3,5,7; Liu, Bo 2,3,5; Jin, Jiapeng 2,3,5; Lu, Jingan 4; Zhou, Jilin 2,3,5; Qian, Jin 1,2,3,7; Wu, Nengyou 1,6
刊名	MARINE AND PETROLEUM GEOLOGY
	2020-05-01
卷号	115 页码:11
关键词	Gas hydrate Heterogeneous distribution Geostatistical inversion Lithofacies Production test
ISSN号	0264-8172
DOI	10.1016/j.marpetgeo.2020.104298
通讯作者	Wang, Xiujuan(wangxiujuan@qdio.ac.cn)
英文摘要	Porosity, 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.
资助项目	National Key R&D Program of China[2017YFC0307601] ; National Natural Science Foundation of China[41676041] ; National Natural Science Foundation of China[41976077]
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000519654400031
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/165837]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Wang, Xiujuan
作者单位	1.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 3.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 4.MNR, Guangzhou Marine Geol Survey, Guangzhou 510760, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.MNR, Lab Gas Hydrate, Qingdao Inst Marine Geol, Qingdao 266071, Peoples R China 7.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China
推荐引用方式 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.