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巴西盐下巨型湖相介壳灰岩储层是当前全球油气勘探的热点,潜力巨大但研究程度却较低。本文结合岩心、薄片、地震和综合地质录井数据等资料,对巴西坎波斯盆地西部隆起带盐下白垩系Lagoa Feia组湖相介壳灰岩的岩石学特征、沉积学特征、地震反射特征和沉积模式进行了深入分析。坎波斯盆地介壳灰岩包含生物礁灰岩和颗粒灰岩2种主要类型,是以双壳类硬质壳体为主,介形类和腹足类壳体为辅,并含有其他碳酸盐岩组分和部分硅质碎屑的岩性复合体。该盆地介壳灰岩总体发育于滨浅湖区域,可划分出湖缘、生物碎屑砂质滩、生物碎屑灰质滩、鲕粒滩、生物礁后滩、生物礁和生物碎屑滑塌扇等7种主要相带类型。分析了几种主要相带对应的地震反射特征,建立了断陷湖盆边缘镶边台地介壳灰岩沉积模式,其中生物礁相带的提出系基于新资料经研究后提出的新认识,与前人持有的介壳灰岩滩坝观点有所不同。本文研究结果对于类似地区的油气勘探具有指导作用。
The massive lacustrine-bedded limestone reservoir under Brazil salt is the hotspot of global oil and gas exploration currently, with great potential and low degree of research. In this paper, the lithology, sedimentary characteristics, seismic reflection characteristics and sedimentary characteristics of lacustrine limestone in Cretaceous Lagoa Feia Formation in the western uplift zone of Campos Basin in Brazil are analyzed based on the data of cores, thin slices, earthquakes and comprehensive geological logging data. Model in-depth analysis. The Campanian shell limestone contains two main types of reef limestone and grain limestone. It is dominated by bivalve hard shell, supplemented by the genera and gastropod shell and contains other carbonates Rock components and some of the siliciclastic lithological complexes. The sandstones of this basin generally develop in the coastal shallow lake area, and can be divided into lakeside, biological debris sandy beach, biological debris beach, oolitic beach, reef beach, reef and biological debris slush fan And other seven kinds of the main phase type. The seismic reflection features corresponding to several major facies belts are analyzed and the sedimentary pattern of the crustal limestone in the margin of the fault lake basin is established. The reef facies belts are proposed based on the new understanding of the new data after the study, Hold the limestone dyke dam beach view is different. The results of this paper can guide oil and gas exploration in similar areas.