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莫桑比克B区块位于莫桑比克伊尼扬巴地区潘德(Pande)气田的西部。该区域侏罗系、白垩系和第三系沉积发育,具有断裂相关的裂谷系统,主要为下赞比西地堑和内陆地堑系统(陆上)以及赞比西三角洲(海上)。独特的区域构造背景形成了独特的沉积盆地,该盆地位于中低纬度地区,发育了多套膏盐岩。以莫桑比克B区块钻井资料为基础,采用地球化学分析方法并结合前期研究成果,对莫桑比克B区块油气资源进行了推断性评价。利用莫桑比克盆地不同时期20口井的样品的氢、氧指数资料绘制了范氏图,重点辨识了烃源岩、干酪根类型和总有机碳含量(TOC)。分析结果表明:莫桑比克B区块烃源岩以Ⅲ型干酪根为主,平均TOC为0.5%;只有马普托地层和部分下玳瑁页岩地层含有可能提供烃源的沉积物;马普托地层在有利于烃源岩发育的环境中可能存在富集的有机质,具备一定的勘探开发潜力;该区块储集层分布范围较小,油气资源富集程度不高,若以常规方式开发,商业价值有限。
Block B of Mozambique is located west of the Pande gas field in Inhambaya, Mozambique. The Jurassic, Cretaceous and Tertiary sediments developed in the area and have rift-related rift systems, mainly the Lower Zambezi Graben and inland graben systems (onshore) and the Zambezi Delta (offshore). The unique regional tectonic setting has formed a unique sedimentary basin, which is located in the middle and low latitudes and has developed multiple sets of gypsum salt rocks. Based on the drilling data of block B in Mozambique, the geochemical analysis method and the previous research results are used to make an inferential assessment on hydrocarbon resources in block B of Mozambique. Based on the hydrogen and oxygen index data of 20 wells from different periods in the Mozambique Basin, a Fan graph was drawn and the source rocks, kerogen types and total organic carbon (TOC) were identified. The results show that the source rocks of Block B in Mozambique are mainly type Ⅲ kerogen and the average TOC is 0.5%. Only the Maputo stratigraphy and some turtles below the shale contain sediments that may provide hydrocarbon source. The Maputo Formation In the environment conducive to the development of source rocks, organic matter may be enriched and has certain potential for exploration and development. The reservoirs in this block have a relatively small distribution range and a low degree of hydrocarbon accumulation. If developed in a conventional manner, commercial Limited value.