巴西坎波斯盆地湖相介壳灰岩特征及沉积模式

发布时间：2019-03-04 10:54

【摘要】：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。
[Abstract]:The giant lacustrine mesophase limestone reservoir under salt in Brazil is the hot spot of oil and gas exploration in the world at present, which has great potential but low research degree. In this paper, the petrological and sedimentological characteristics of the lacustrine crust limestone of the Lower Cretaceous Lagoa Feia formation in the western uplift zone of the Campos Basin, Brazil, are studied in combination with core, thin slice, earthquake and comprehensive geological logging data. Seismic reflection characteristics and sedimentary models are analyzed in depth. The mesoclast limestone in Campos basin contains two main types: bioreef limestone and granular limestone. It is mainly composed of bivalve hard shell supplemented by ostracoid and gastropod shell and contains other carbonate rock components and some lithologic complexes of siliceous detritus. The mesoclastic limestone in the basin is generally developed in the shoreline and shallow lake area, and can be divided into seven main facies zones, such as lake margin, bioclastic sand beach, bioclastic ash beach, oolitic beach, back beach of bioreef, reef and bioclastic slide fan. The seismic reflection characteristics corresponding to several main facies zones are analyzed, and the sedimentary models of meso-crust limestone on the margin of fault depression lake basin are established, in which the reef facies zone is proposed based on the new knowledge proposed by the new data. It is different from the viewpoint of mesoporous limestone beach dam held by predecessors. The results of this paper can be used to guide oil and gas exploration in similar areas.
【作者单位】：中海油研究总院;
【基金】：“十二五”国家科技重大专项“海外大陆边缘盆地勘探开发实用新技术研究(编号:2011ZX05030-003)”部分研究成果
【分类号】：P618.13

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