RESERVOIR CHARACTERISTICS AND INFLUENTIAL FACTORS IN THE EASTERN DEPRESSION OF THE NORTH YELLOW SEA BASIN
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摘要: 北黄海盆地东部坳陷发育厚层中、新生代地层,其中侏罗系和白垩系是目前研究的主要目的层段。依据最新油气资源调查获得的原始资料并结合区域地质资料,对该区中生代的储层特征进行了较为深入的分析,认为研究区储层物性总体较差,多为以次生孔隙为主的低孔、低渗和特低孔、特低渗储层;储层的储集空间类型多为以粒内孔隙为主的孔隙型和裂缝型;主要成岩作用类型包括压实压溶作用、胶结作用、交代作用、溶蚀作用等。影响储层物性的因素主要包括:对储层起破坏作用的压实作用、胶结作用都比较强,而对储层起建设性的溶蚀作用总体上较弱,构造破裂对储层物性仅有一定的改善作用。Abstract: Mesozoic and Cenozoic deposits occur widely in the Eastern Depression of the North Yellow Sea Basin. The Jurassic and Cretaceous are the main targets for hydrocarbon reservoirs. Based on the data from the surveys recently conducted for oil and gas resources, and together with the data from regional geological surveys in the region, we studied the characteristics of the Cretaceous reservoirs in this paper. Our results indicate that the reservoirs in the study area are low or very low in both porosity and permeability. The storage spaces are mainly provided by secondary interstitial pores formed by dissolution and fracturing. The deposits have suffered from various types of diagenesis, such as compaction, cementation, replacement, and dissolution. The strong compaction and cementation obviously play a great role in control over the poor reservoir properties, but the weak dissolution and fracturing may improve the reservoir properties to some extent.
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Key words:
- eastern depression /
- North Yellow Sea Basin /
- reservoir /
- influential factors
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