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济阳坳陷在湖湘碳酸盐岩储层发现了多口高产油流井。但由于对该类储层的认知较少,导致后续的勘探效果不佳。为了拓展胜利油区增储上产的新领域,开展了湖相碳酸盐岩分布规律及沉积模式研究。在4 000余口探井的层序地层划分和岩性统计的基础上,通过区域研究和区带解剖,系统分析了济阳坳陷层序框架内碳酸盐岩分布规律,并建立了断陷湖盆碳酸盐岩沉积模式。研究表明:济阳断陷湖盆碳酸盐岩纵向上主要分布于二级层序沉积基准面上升半旋回,平面上呈环带状分布于斜坡断裂带。其中,缓坡带分布广泛,以颗粒型碳酸盐岩为主;阶式陡坡带局部发育碳酸盐岩,主要为生物粘结型和颗粒型碳酸盐岩;洼陷带则不利于碳酸盐岩发育。从湖盆边缘向洼陷方向,依次形成颗粒型、生物粘结型和泥晶型碳酸盐岩。
Jiyang Depression in Huxiang carbonate reservoir found in a number of high-yield wells. However, due to the lack of understanding of such reservoirs, subsequent exploration results are not good. In order to expand the Shengli oil field to increase production and production of new areas, carried out the distribution of lacustrine carbonate rocks and sedimentary patterns. Based on the sequence stratigraphy and lithology statistics of more than 4 000 exploration wells, the distribution of carbonate rocks in the sequence framework of Jiyang depression was systematically analyzed through regional studies and zonal dissections. Basin Carbonate depositional model. The results show that the carbonate rocks in the basin of Jiyang faulted basin are mainly distributed in the half-cycle of the second-order sedimentary basement in the longitudinal direction, and distributed in the form of ring-shaped belt on the slope fault zone in the plane. Among them, the gentle slope belt distributes extensively, which is mainly composed of granular carbonate rocks. The carbonate rocks in the stepped steep slope belt are mainly composed of bio-cohesive and granular carbonate rocks, while the sag belt is not favorable to carbonate Salt rock development. From the edge of the lake basin to the subsidence direction, granular type, bioadhesive type and muddy type carbonate rocks are formed in turn.