涠洲6-8油田流一段钻后储层研究

发布时间：2018-02-24 04:23

本文关键词： 储层预测地震反演元素分析沉积微相分析　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：涠洲6-8油田是南海北部湾盆地海域内已实施开发的海上油田,目前涠洲6-8油田已钻探WZ6-8-1井、WZ6-8-2井、WZ6-8-3井三口探井,同时针对流一段四油组侧钻WZ6-8-A3H井、WZ6-8-A3H1两口水平开发井。其中2口水平井均钻遇多个孤立岩性砂体,砂体连通性差,油层分布不连续,储量规模不大,与钻前认为的砂体、油层连续分布的认识相差较大。因此,储层的平面展布特征、横向连通性及有利储层分布区需重新认识和评价。目前,该区钻后储层研究工作存在三大难点：1、储层非均质性较强,连续性差；2、储层边界波阻抗差异较小,储层边界难以界定；3、储层厚度小,砂体尖灭和泥岩隔层相间,受地震波分辨率影响明显。针对上述问题,本文通过对研究区古构造、沉积厚度、地震剖面特征分析,结合砂岩成分、重矿物等其他资料,运用储层精细对比、储层非均质性评价、储层砂体预测、沉积微相分析等手段,综合分析得出：涠洲6-8油田流一段四油组砂岩储层的物源主要来自北东向两支曲流河,本次新发现的南北曲流河水道在河床最深切的部位,砂岩储集体富集,同时又位于T8l泥岩、页岩及油页岩生油层之上,水道顶部被间湾泥岩覆盖,能形成独立的岩性圈闭,可能蕴藏油气形成油气藏,值得进一步盘活勘探。
[Abstract]:Weizhou 6-8 oilfield is an offshore oil field that has been developed in the Beibu Gulf basin of the South China Sea. At present, Weizhou 6-8 oilfield has drilled three exploration wells of WZ6-8-1 well WZ6-8-2 well and well WZ6-8-3. At the same time, two horizontal development wells WZ6-8-A3H1 were drilled on the side of WZ6-8-A3H well in the fourth oil formation of Liu 1 formation. Among them, two horizontal wells were drilled with several isolated lithologic sand bodies, the sand body connectivity was poor, the reservoir distribution was not continuous, and the reserve scale was not large, which was similar to the sand body considered before drilling. Therefore, the horizontal distribution characteristics, lateral connectivity and favorable reservoir distribution areas need to be re-recognized and evaluated. In this area, there are three major difficulties in reservoir research after drilling: 1, strong heterogeneity of reservoir, poor continuity, small difference in wave impedance of reservoir boundary, difficulty in defining reservoir boundary, small reservoir thickness, sand body pinching and mudstone interphase, etc. It is obviously affected by the resolution of seismic wave. In view of the above problems, through the analysis of paleotectonics, sedimentary thickness, seismic profile characteristics, combined with other data such as sandstone composition, heavy minerals and so on, this paper applies fine correlation of reservoir, evaluation of reservoir heterogeneity, prediction of reservoir sand body, etc. By means of sedimentary microfacies analysis and other means, it is concluded that the source of sandstone reservoir of the fourth formation of Liu 1 formation in Weizhou 6-8 oilfield mainly comes from two meandering rivers in the NNE direction. The newly discovered north-south meandering river channel is in the deepest part of the riverbed. The sandstone reservoir is enriched and located on T8l mudstone, shale and oil shale source rocks, and the top of the channel is covered by interbay mudstone, which can form an independent lithologic trap and may contain oil and gas to form oil and gas reservoirs, which is worthy of further exploration.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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