Preliminary research on characteristics, distribution patterns and origins of submarine slides in deepwater oil and gas exploration area of Baiyun Sag
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摘要:
白云凹陷深水区是深水油气勘探开发的热点区域，深水地质灾害严重威胁深水油气开发的施工安全，通过研究其主要深水地质灾害海底滑坡的形成、分布，可对深水油气开发过程中不必要的风险和损失进行预测和预防。通过分析中海油高精度三维地震资料，识别了白云凹陷深水油气开发区的海底滑坡以及与之相关的天然气水合物、气烟囱、泥底辟、浅层气和浅水流等深水地质灾害现象。这些深水地质灾害现象与海底滑坡的发育密不可分，是识别海底滑坡的重要因素。利用地球物理属性识别并发现了白云凹陷规模巨大和分布广泛的海底滑坡，并认为超压流体释放、水合物分解、高沉积速率等主导了白云凹陷海底滑坡的发育，这些主要控制因素都是南海北部新构造活动的产物，新构造活动才是海底滑坡的主要成因。
Abstract:Deepwater geohazards, especially submarine slides, may seriously threaten the safe construction of deepwater facilities for oil and gas development. However, the risks and economic losses could be predicted and prevented if the formation mechanism and distribution pattern of submarine landslides are carefully studied. Based on the high-resolution 3D seismic data acquired by CNOOC in the Baiyun Sag, we identified the submarine slide and other deepwater geohazards, such as gas hydrate, gas chimneys, mud diapirs, shallow gas and shallow water, and found that they are closely related. In fact, the decomposition of gas hydrate, release of overpresured fluid and high rate of sedimentation are the main causes of submarine slide in the Baiyun Sag. These controlling factors are resulted from neotectonics in the northern South China Sea. Therefore, neotectonics is the main reason of submarine slides.
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Key words:
- submarine slide /
- deepwater geohazard /
- neotectonics /
- Baiyun Sag
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