Multi-beam and seismic investigations of the active Haima cold seeps, northwestern South China Sea

Bin Liu Jiangxin Chen Li Yang Minliang Duan Shengxuan Liu Yongxian Guan Pengcheng Shu

Bin Liu, Jiangxin Chen, Li Yang, Minliang Duan, Shengxuan Liu, Yongxian Guan, Pengcheng Shu. Multi-beam and seismic investigations of the active Haima cold seeps, northwestern South China Sea[J]. Acta Oceanologica Sinica, 2021, 40(7): 183-197. doi: 10.1007/s13131-021-1721-6
Citation: Bin Liu, Jiangxin Chen, Li Yang, Minliang Duan, Shengxuan Liu, Yongxian Guan, Pengcheng Shu. Multi-beam and seismic investigations of the active Haima cold seeps, northwestern South China Sea[J]. Acta Oceanologica Sinica, 2021, 40(7): 183-197. doi: 10.1007/s13131-021-1721-6

doi: 10.1007/s13131-021-1721-6

Multi-beam and seismic investigations of the active Haima cold seeps, northwestern South China Sea

Funds: The Shandong Province “Taishan Scholar” Construction Project; the fund of the Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao) under contract No. MMRKF201810; the National Natural Science Foundation of China under contract No. 41606077; the National Key R&D Program of China under contract No. 2018YFC0310000.
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  • Figure  1.  Location of the geological map on the northern slope of SCS (a); geological background of the Haima cold seeps, and the study area is surrounded by several sags (b); and four sites of gas bubble plumes (yellow circle), labeled as A, B, C, and D were observed in the multi-beam water-column data (c). The pink lines are 2D multichannel seismic lines that pass through the plumes. Note that Plumes B, C, and D are crossed by seismic lines Multi-Channel Seismic (MCS) 1236, MCS L440, MCS 1218, respectively. Near-seafloor gas hydrates were recovered at Sites ROV1 and ROV2 (red dots) at 3–8 m below the seafloor with a 9 m-long, 73 cm-wide, and 1 000 kg-weight gravity piston corer (PC). The black line through ROV1 and ROV2 is the seismic line shown in Wang et al. (2018b). ZRMB: Zhujiang River Mouth Basin, QDNB: Qiongdongnan Basin.

    Figure  2.  The water column images of gas bubble plumes (a, b, c and d), and the water column images of Plume C from different multi-beam lines (0060, 0063 and 0066) (e). In a, b, c and d, the water depths of the four plumes where they disappear are 645 m, 630 m, 650 m, and 647 m; the corresponding seafloor water depths are 1 380 m, 1 380 m, 1 420 m, and 1 470 m; thus the vertical lengths of the plumes, namely “height”, are 735 m, 750 m, 770 m, and 823 m, respectively. In e, the interval between successive lines is 3 h. Plume C is inclined to the northeast at all the three survey lines. The shape of Plume C seems to change over time, but its upper limit seems to be almost invariant (640 m ± 10 m).

    Figure  3.  Bathymetry (a) and backscatter data show seafloor geomorphological and acoustic sedimentary details (b). Note that the Haima cold seeps are located on a gentle slope.

    Figure  4.  Seismic expressions of the fluid process associated with Plume B. a. The 2D seismic line 1236 passing through Plume B, showing the uplifted basements and the overlying gas chimneys; and b. the detailed image of the zone denoted by the black box in Fig. 4a, which illustrates the faulted zone and the BSRs on the top of GC1. In a, the location of the seismic line is depicted in Fig. 1b, and the section is divided into three parts for further discussion. In b, an acoustic blanking zone is directly above the BSRs, through which a pipe-like structure rises to the seafloor and connects to Plume B. Wispy fluid expulsion anomalies, perhaps paleo-pockmarks, are indicated by yellow arrows. GC: gas chimney, BS: bright spot, BSR: bottom simulating reflector.

    Figure  5.  Seismic expressions of the fluid process associated with Plume C. a. Seismic section of MCS line L440 passing through Plume C, showing a basement uplift with a flat roof, topped by a large-scale gas chimney; and b. detailed image of the zone marked by the black box in Fig. 5a. In addition to Plume C, pockmarks (PM1 and PM2) are observed. The acoustic blanking zones and vertical amplitude anomalies are also shown between the seafloor and the BSRs. c. Zoomed figure showing PM1, PM2 and the corresponding underlying vertical anomalies; and d. zoomed figure showing the detailed structure beneath Plume C. GC: gas chimney, PM: pockmark, BSR: bottom simulating reflector, TWT: two-way traveltime.

    Figure  6.  Seismic expressions of the fluid process associated with Plume D. a. Seismic section of the MCS line 1218 passing through Plume D, showing a rough, fluctuant basement and a minor gas chimney; and b. detailed image of the zone marked by the black box in Fig. 6a. Enhanced reflection zones occur beneath the BSRs. Acoustic blanking zones emerge in the overlying strata. Atop of the gas chimney, a V-shaped anomaly exists, corresponding to the deflecting amplitude anomaly and Plume D. GC: gas chimney, BS: bright spot, BSR: bottom simulating reflector, TWT: two-way traveltime.

    Figure  7.  Seismic attributes associated with the cold seep. a. Time slice of the 3D seismic volume at 2 300 ms two-way traveltime; and b. RMS amplitude attribute derived from the 3D seismic volume. The red lines indicate the locations of part of the Line 1218 which passes through Plume D. The area where the gas chimney developed exhibits low-value features in both slices. In addition, several medium-high and high-value zones are observed in the north, northwest, and southeast of RMS amplitude attribute slice. BSR: bottom simulating reflector.

    Figure  8.  Hydrate stability phase diagram and the CTD temperature results. The intersection of the hydrate phase boundary curve (blue line) with the temperature curve (red line) defines the upper limit of the GHSZ in the water.

    Figure  9.  The schematic diagram of the model of gas migration, gas hydrate accumulation, and the related seepage at the Haima cold seeps. BSRs: bottom simulating reflectors.

    Table  1.   Differences of the seismic expressions and plumes at the four seep sites

    SiteSeismic anomalies about fluid migrationConduit (pipe-like structure)Water depth of
    termination of
    plume/mbsl
    Diameter of
    the root of
    plumes/m
    A//64526
    Bgas chimney (>10 km wide), bright spot, paleo-pockmarks (?)strictly columnar, high amplitude63028
    Cgas chimney (>10 km wide), pockmarksdiffuse, dimmed amplitude65050
    Dgas chimney (~1 km wide), enhanced reflections,
    bright spot, dome-shaped anomaly
    deflecting, moderate amplitude64733
    Note: “/” indicates that the corresponding feature is not found, and mbsl means m below the sea level.
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出版历程
  • 收稿日期:  2020-10-10
  • 录用日期:  2020-12-11
  • 网络出版日期:  2021-06-28
  • 刊出日期:  2021-07-25

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