Detailed reviews of multichannel seismic reflection, sparker, chirp and multibeam data that were collected on the southern Marmara Sea shelf revealed various shallow gas indicators and related sedimentary structures, including enhanced reflections, seismic chimneys, acoustic blanking, bright spots, pockmarks, mound-like features and seeps. Seismic attribute analyses were applied to characterise the existence of gas-bearing sediments. The distribution of shallow gas indicators provides important insights into their origin and the geological factors that control them. Prominent gas accumulations and seeps are observed along the profiles that cross the branches of the central segment of the North Anatolian Fault Zone, which indicates that the gas seeps are controlled by active faulting. This indicates that the faults act as conduits through the sedimentary column. The dense occurrences of gas directly off the river mouths along the shallow bays provide clues about the organic-rich carbon content of the sediments and biogenic methane generation. In some areas, the gas-related acoustic anomalies are mostly located in the upper sediments below the marine unit, which indicates that the gas emissions in these areas were terminated as a result of the increased overburden pressure after the Holocene sea level rise and the deposition of the marine unit.

中文翻译：

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活动断层和海平面变化对土耳其南部马尔马拉大陆架北安纳托利亚断层中央分支浅层气藏分布和与天然气有关的地震结构分布的控制

对在马尔马拉海架南部收集的多道地震反射、火花、啁啾和多波束数据的详细审查揭示了各种浅层气体指标和相关的沉积结构，包括增强反射、地震烟囱、声学消隐、亮点、麻点、土丘状特征和渗漏。应用地震属性分析来表征含气沉积物的存在。浅层气体指标的分布为了解它们的起源和控制它们的地质因素提供了重要的见解。沿着穿过北安纳托利亚断裂带中央段分支的剖面观察到明显的气体聚集和渗漏，这表明气体渗漏受活动断层控制。这表明断层充当了穿过沉积柱的管道。沿着浅海湾直接从河口流出的密集气体提供了有关沉积物富含有机碳含量和生物甲烷生成的线索。在一些地区，与气体有关的声学异常主要位于海相单元下方的上层沉积物中，表明这些地区的气体排放是由于全新世海平面上升和沉积后上覆压力增加而终止的。海事单位的。