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北部湾盆地涠西南凹陷是一个复杂断陷型富生烃凹陷,发育了一系列断裂带,尤其涠洲组多以小型断块型油藏为主,断块构造极其复杂,断块圈闭的高部位是否成藏很难落实。WZ11-7N-3井涠洲组未见油气显示;向圈闭高部位侧钻WZ11-7N-3Sa井,在涠洲组三段见68m油斑细砂岩及粗砂岩油气显示,解释油层62.1m,增探明储量243.5×104m3,控制储量46.3×104m3,勘探实践证实在高部位已经成藏。通过对WZ11-7N-3井流体包裹体分析化验结果进行分析,与3Sa井油层对应的砂组,含烃流体包裹体含量明显高于水层含烃类包裹体,均在30%以上;与3Sa井水层对应的砂组盐水包裹体含量明显高于油层对应砂岩的盐水包裹体,均在80%以上。证实油气经过WZ11-7N-3井运移至高部位成藏。复查老井,通过流体包裹分析,可以落实一批类似的断块型圈闭高部位是否成油藏,增加新增探明储量,提高探井的成功率,降低风险,短期内就可以指导勘探,该研究思路值得推广使用。
The Beixiwan depression in the Beibuwan Basin is a complex fault-type hydrocarbon-rich hydrocarbon depression with a series of fault zones developed. In particular, the Weizhou Formation mostly consists of small fault block reservoirs, with extremely complicated fault structures and high fault block traps Whether the site is difficult to implement accumulation. Well WZ11-7N-3 Weizhou No formation of oil and gas show; to the upper part of the high-pressure drilling WZ11-7N-3Sa well, the third section of the Weizhou Formation see 68m oil spot fine sandstone and coarse sandstone oil and gas shows that the interpretation of 62.1m , Increase proven reserves of 243.5 × 104m3, control reserves of 46.3 × 104m3, proven exploration has been accumulated in the high parts. Based on the analysis of the fluid inclusions in Well WZ11-7N-3, the content of hydrocarbon-bearing fluid inclusions in the sand group corresponding to the 3Sa well is obviously higher than that of the hydrocarbon-bearing inclusions in the water layer, all of which are above 30% The content of salt inclusions in the sand group corresponding to the 3Sa well is obviously higher than that of the sandstone corresponding to the reservoir, both of which are over 80%. Confirmed that oil and gas migrate to high positions through WZ11-7N-3 reservoir. Review of the old wells, through the fluid package analysis, can be implemented a number of similar fault block type trap high parts into a reservoir, increase the new proven reserves, increase exploration success rate and reduce risk in the short term can guide exploration, The research ideas worth promoting.