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富县探区位于鄂尔多斯盆地中部,近年来的勘探成果表明,长8段油藏的储层以细砂岩为主、储层孔隙度介于5%~15%,渗透率一般小于0.5×10~(-3)μm~2,主要发育致密储层,且非均质性明显;长8段油藏没有明显的油藏边界,油水亦无统一的分异界面,开发的主要对象为物性较好、产油量相对较高的“甜点”油藏,生产需经过压裂,上述特征表明长8段油藏为致密型油藏。根据富县探区长8段的地质背景及油藏特征分析,研究认为该区长8段油藏是近源充注的结果,其分布主要受长7段优质烃源岩的展布以及长8段物性较好的“甜点”型储层共同控制;由于区域性地史演化较为稳定,油藏在成藏之后没有发生大的破坏,所以油藏保存条件普遍较好,该因素对油藏的分布不起主要控制作用。根据上述油藏控制因素分析认为,富县探区中南部2个区块不但砂体发育,而且西邻长7段烃源岩发育区,应是长8段成藏的有利区带。
The exploration results of Fuxian exploration area are located in the middle Ordos Basin. The exploration results in recent years show that the reservoirs of Chang 8 reservoir are mainly composed of fine sandstone with reservoir porosity ranging from 5% to 15% and permeability less than 0.5 × 10 ~ (-3) μm ~ 2, and the main reservoirs are tight reservoirs with obvious heterogeneity. There is no obvious reservoir boundary in Chang 8 reservoir and no uniform boundary between oil and water. The main object of development is good physical properties , The relatively high oil yield “sweet ” reservoir, the production needs to be fractured, the above characteristics show that Chang 8 reservoir is a tight reservoir. According to the geological background and reservoir characteristics of the 8th member of Fuxian prospecting zone, it is considered that the 8 reservoirs in this area are the result of near-source charge, and their distribution is mainly affected by the distribution and long Because of the relatively stable historical evolution of the area, no significant damage occurred to the reservoir after its accumulation, so the reservoir preservation conditions are generally better, and the factors The distribution of reservoirs can not play a major controlling role. Based on the above reservoir control factors, it is considered that the two blocks in central and southern Fuxian exploration area are not only sand body development, but also the development zone of source rock in the Chang 7 member in the west should be the favorable zone for the accumulation of Chang 8 Member.