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三塘湖盆地自上世纪90年代勘探以来,先后在侏罗系碎屑岩,二叠系碳酸盐岩、火山岩,石炭系火山岩中发现具不同压力系统油气藏,根据试油资料分析发现,侏罗系压力系统为低压,且自南西向北东地层压力系数逐渐升高,二叠系为正常-高压压力系统,石炭系为低压-正常压力系统,二叠系及石炭系压力系数展布都具有南高北低的趋势。目前应用测井资料预测地层压力是一条有效的途径,因异常压力形成机制不同,适合的压力预测方法也有所不同。通常基于压实趋势线的等效深度法适用于砂泥岩剖面的压力预测,而对三塘湖盆地火山岩剖面来说,因缺少泥岩层,难以构建正常压实趋势线,压实趋势线法受到限制。本文针对三塘湖盆地不同岩性地层,不同异常压力形成机制,分别采用压实趋势线法及有效应力法对地层压力进行了预测,获得了比较满意的结果,为本区下一步勘探开发提供了思路。
Since the exploration of Santanghu Basin in the 1990s, different pressure system reservoirs have been found in the Jurassic clastic rocks, Permian carbonate rocks, volcanic rocks and Carboniferous volcanic rocks. According to the test oil data, The Jurassic pressure system is low pressure, and the pressure coefficient gradually increases from southwest to north east, Permian is normal-high pressure system, Carboniferous is low pressure-normal pressure system, Permian and Carboniferous pressure coefficient distribution All have the trend of high in the south and low in the north. The current application of logging data to predict formation pressure is an effective way. Due to the different mechanism of formation of abnormal pressure, suitable pressure prediction methods are also different. The equivalent depth method based on the compaction trend line is usually applied to the pressure prediction of sandstone shale profile. For the volcanic profile of Santanghu Basin, it is difficult to construct the normal compaction trend line because of the lack of mudstone and the compaction trend line method is affected limit. In this paper, according to the formation mechanism of different lithology strata and different abnormal pressure in the Santanghu Basin, the formation pressure is predicted by the compaction trend line method and the effective stress method respectively. Satisfactory results are obtained for the next exploration and development in this area The idea.