Reservoir characterization of gas hydrate in the Northwestern part of the Ulleung Basin, East Sea

被引：7

作者：

Kim, Kyoung-Jin ^{[1
]}

Yi, Bo-Yeon ^{[2
]}

Kang, Nyeon-Keon ^{[2
]}

Yoo, Dong-Geun ^{[1
,2
]}

机构：

[1] Univ Sci & Technol, Dept Petr Resources Technol, Daejeon, South Korea

[2] Korea Inst Geosci & Mineral Resources, Petr & Marine Res Div, Daejeon, South Korea

来源：

MARINE GEORESOURCES & GEOTECHNOLOGY | 2017年 / 35卷 / 02期

关键词：

Gas-hydrate; gas hydrate stability zone; gas migration; seismic attribute; Ulleung Basin; SEISMIC STRATIGRAPHY; JAPAN SEA; MIGRATION; INSIGHTS; METHANE; MARGIN; RIDGE;

D O I：

10.1080/1064119X.2016.1139644

中图分类号：

P75 [海洋工程];

学科分类号：

0814 ; 081505 ; 0824 ; 082401 ;

摘要：

An analysis of 3D seismic data from the northwestern part of the Ulleung Basin, East Sea, revealed that the gas hydrate stability zone (GHSZ) consists of five seismic units separated by regional reflectors. An anticline is present that documents activity of many faults. The seismic indicators of gas hydrate occurrence included bottom simulating reflector (BSR) and acoustic blanking in the gas hydrate occurrence zone (GHOZ). By the analysis of the seismic characteristics and the gradient of the sedimentary strata, the GHOZ was divided into four classes: (1) dipping strata upon strong BSR, (2) dipping strata below strong BSR, (3) parallel strata with acoustic blanking, and (4) parallel strata below weak BSR. Seismic attributes such as reflection strength and instantaneous frequency were computed along the GHOZ. Low reflection strength and high instantaneous frequency were identified above the BSR, indicating the occurrence of gas hydrate. A remarkably high reflection strength and low instantaneous frequency indicated the presence of free gas below the BSR. Considering the distribution of the gas hydrate and free gas, two gas migration processes are suggested: (1) stratigraphic migration through the dipping, permeable strata and (2) structural migration from below the GHSZ along faults.

引用

页码：226 / 235

页数：10

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