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粒屑灰岩岩性油藏是辽河西部凹陷隐蔽油气藏的一个主要类型。由于受不对称的箕状断陷及其垒堑相间的构造格局的控制,盆地内沙四段沉积相带的分布,东西不对称,南北分异。盆地西部缓坡带的北部具有适于粒屑灰岩形成的条件,因而形成粒屑灰岩相带。高升油田的粒屑灰岩岩性油藏,就是沙四段在缓坡带沉积的粒屑灰岩被沙三段生油泥岩复盖,从而形成岩性油藏。 粒屑灰岩储集岩的孔隙可分为两类:原生和次生孔隙,即原生的—粒间孔隙,次生的—粒间溶孔和裂缝。储集岩的有效孔隙率主要决定于原生粒间孔隙,即鲕粒和生物碎屑颗粒的粒间孔隙的发育程度。
The granulite limestone reservoir is a major type of subtle reservoirs in the western Liaohe depression. Owing to the asymmetry of the graben-like fault depression and the control of the tectonic framework between its grab and facies, the distribution of sedimentary facies belt in the fourth member of Shahejie Formation is asymmetric in east and west and varies from north to south. The northern part of the gentle ramp in the western part of the basin has the conditions suitable for the formation of granulitic limestone, thus forming granulitic limestone facies belt. The granulitic limestone reservoirs in Gaosheng Oilfield are characterized by the deposition of granulite limestone in the gentle slope zone of the fourth member of the Shahejie Formation by the third member of the Shahejie formation oil and mudstone to form a lithologic reservoir. The pores of granulite limestone reservoirs can be divided into two types: primary and secondary pores, namely primary-intergranular pores, secondary intergranular pores and fissures. The effective porosity of the reservoir rocks is mainly determined by the primary intergranular pores, ie, the degree of development of the intergranular pores of the oolite and bioclastic particles.