Abstract This work intends to understand how the Ponta do Mel carbonate platform was implanted, to characterize its depositional model and its evolution in the light of modern stratigraphy, as well as to understand the stratigraphic relations with beneath, overlapping and contemporary units, from wells and seismic data. The focus area of this study corresponds to a belt in the offshore portion of the Potiguar Basin, which runs parallel to the shoreline, about 40 km from it. The carbonate rocks of the Ponta do Mel Formation date from the Late Albian and, similar to what occurs in the other basins of the Brazilian continental margin, their deposition is related to the separation events of the African and South American continents. In the stratigraphic analysis of the wells (1D analysis), it was possible to characterize carbonate lithofacies, that are the predominant, as well as mixed and siliciclastic lithofacies. It was also possible to individualize shallowing upward cycles and cycle sets, which were associated with the identified systems tracts. In the seismic stratigraphic analysis, in the same way, four seismic facies were visualized, which, in general, are related to the tractive processes involved in the deposition of the carbonate, mixed and siliciclastic lithofacies, defined in the 1D analysis. The integration of the results from the well data analysis to the seismic stratigraphic analysis allowed to understand that the studied interval, which coincides, in lithostratigraphic terms, with the Ponta do Mel Formation, represents a complete depositional sequence, here referred to as the Albian-Cenomanian Sequence, formed by the Lowstand Systems Tract (LST), Transgressive Systems Tract (TST), and Highstand Systems Tract (HST). The sedimentation history of the Ponta do Mel unit started from the deposition of siliciclastic and carbonate facies in a shallow water platform environment. Then, with the increase in the accommodation space, in a transgressive phase, a thick interval of deeper water facies, represented mainly by calcilutites and pelitic rocks, was deposited. At the end of this interval, facies of coarser granulation, represented mainly by thick calcarenites layers, and sometimes calcirrudites, started to dominate the platform scenario, denoting a regressive phase and thus ending the Albian-Cenomanian Sequence.

中文翻译：

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巴西东北部 Potiguar 盆地 Albian-Cenomanian ponta do mel 碳酸盐台地地层分析

摘要 本工作旨在了解 Ponta do Mel 碳酸盐岩台地是如何被植入的，从现代地层学角度表征其沉积模式及其演化，并从井和井中了解其与下方、重叠和当代单元的地层关系。地震数据。本研究的重点区域对应于 Potiguar 盆地近海部分的一条带，该带平行于距海岸线约 40 公里的海岸线。Ponta do Mel 组的碳酸盐岩可追溯到阿尔比安晚期，与巴西大陆边缘其他盆地中发生的情况类似，它们的沉积与非洲和南美洲大陆的分离事件有关。在井的地层分析（一维分析）中，可以表征碳酸盐岩相，这是主要的，以及混合和硅质碎屑岩相。还可以个性化与已识别系统区域相关的浅化上行周期和周期集。在地震地层分析中，以同样的方式可视化了四种地震相，它们通常与一维分析中定义的碳酸盐岩、混合岩和硅质碎屑岩相沉积所涉及的牵引过程有关。将井数据分析结果与地震地层分析结果相结合，可以了解到所研究的层段与 Ponta do Mel 组在岩石地层学上重合，代表了一个完整的沉积层序，这里称为 Albian-由低水位系统域 (LST) 形成的森诺曼阶层序，海侵系统域 (TST) 和高位系统域 (HST)。Ponta do Mel 单元的沉积历史始于浅水台地环境中硅质碎屑和碳酸盐相的沉积。随后，随着容纳空间的增加，在海侵阶段，沉积了以方解石和泥质岩为主的较厚的较深水相层段。在该期末，以厚钙屑岩层为主，有时以钙屑岩为代表的较粗颗粒相开始主导地台情景，表明为海退期，从而结束了阿尔布-森诺曼阶。Ponta do Mel 单元的沉积历史始于浅水台地环境中硅质碎屑和碳酸盐相的沉积。随后，随着容纳空间的增加，在海侵阶段，沉积了以方解石和泥质岩为主的较厚的较深水相层段。在该期末，以厚钙屑岩层为主，有时以钙屑岩为代表的较粗颗粒相开始主导地台情景，表明为海退期，从而结束了阿尔布-森诺曼阶。Ponta do Mel 单元的沉积历史始于浅水台地环境中硅质碎屑和碳酸盐相的沉积。随后，随着容纳空间的增加，在海侵阶段，沉积了以方解石和泥质岩为主的较厚的较深水相层段。在该期末，以厚钙屑岩层为主，有时以钙屑岩为代表的较粗颗粒相开始主导地台情景，表明为海退期，从而结束了阿尔布-塞诺曼阶层序。 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?