TYPES OF SEA-BOTTOM CHANNELS AND RELATED GASHYDRATE ACCULULATIONS IN THE SHENHU AREA, SOUTH CHINA SEA (SCS)
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摘要:
2007年和2015年，我国在南海北部神狐海域的水合物钻探结果揭示，水合物在赋存空间上表现为不均匀性。该区域发育多种类型的深水水道，基于水道特征开展不同类型水道的描述，并分析其对水合物成藏差异性的影响，将对该区域水合物的勘探和后续开采具有重要意义。通过地震剖面的综合解释和井震心综合分析，对神狐海域的水道类型进行了划分，探讨了水合物成藏的差异。结果表明，研究区的水道可划分为“V”型、迁移“V”型、“U”型和碟型等4种类型，不同类型水道的水合物赋存特征各异。“V”型和迁移“V”型水道的水合物主要富集在峡谷壁垮塌沉积中，但富存程度较低；“U”型水道的水合物主要富集在谷底沉积和两侧天然堤中；碟型水道的水合物主要富集在水道末端朵体及越岸扇体中。综合解释认为，沉积速率和水流侵蚀速率是造成神狐海域不同类型水道中水合物成藏差异的主要因素。
Abstract:The drilling data collected from the Shenhu area in the years from 2007 to 2015 reveals that the area is rich in gas hydrate, which is greatly heterogenous in spatial distribution. There are many channels of different kinds developed in the study area. It is significant to study the types of channels and its bearing on gas hydrate accumulation as well as their impacts on future exploration. Through seismic interpretation and integrated analysis of seismic, logging and coring data, we made a classification of channel types and related hydrate accumulations. According to their shape and genesis, there are four kinds of channels: the "V" shaped channel, migrating "V" shaped channel, "U" shaped channel and saucer shaped channel. The characteristics of gas hydrate accumulation depend upon to some extent the types of channels. The gas hydrate reservoir in the "V" shape or migrating "V" shape channels, which usually have low hydrate abundance, are mostly located in the collapse deposits along the canyon wall. As to the "U" shaped channel, gas hydrates are mainly accumulated in the thalweg and levee deposits. In the Saucer shape channels, however, gas hydrates are mainly deposited in the coarse grained sediments of terminal lobes and overbank fans. The sedimentation rate and flow erosion rate are the main factors to the gas hydrate accumulation in variable shape d channels.
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