三维地震资料解释的地质效果

在东濮凹陷文南三维区块200km²范围内,经过对三维地震资料的解释,取得了以下主要地质成果:1.在断层解释方面,纠正了以往利用二维地震资料对走向断层、横断层解释的不合理性,提高了断层的解释精度,使解释的断层与钻井钻遇断层符合率提高了22.3%。2.在地质构造解释方面,进一步落实了该区的构造形态,提高了解释的地质构造与钻探的符合率;而且还新发现断鼻构造和小潜山三个。3.在地层与岩性解释方面,纠正了文113井钻井分层资料的错误,S₂^下地层新增含油砂岩面积26.9km²。这些地质成果说明,三维地震勘探方法在解决细致地质问题方面确实比二维地震勘探效果要好。因此,在二维地震资料不好,但有可能拿到相当油、气地质储量的地区,进行三维地震勘探是十分有益的。

The geologic effect of 3/D seismic interpretation Fu Tongqing

The interpretation of 3-D seismic data in Wennan prospect (about 200 km²)，Dongpu depression, brings the following geologic results. 1.The unreasonable 2-D interpretations of strike faults and cross faults nave been corrected to improve the accuracy of fault interpretation. The conformability between interpreted faults and drilled faults increased by a factor of 22.3%. 2.The shapes of interpreted structures in this prospect were further ascertained to improve the conformability between drilling and interpre/tation. Three ones of faulted rose and small buried hill were newly discovered. 3. The mistakes in stratigraphic horizons in the well Wen 113 have been corrected. Oil-bearing sand area in low section of S₂ formation increased by 26.9 km².These achievements show that 3-D seismic exploration is indeed superior to 2-D seismic exploration in prospecting for details of geologic structure. Thus, 3/D seismic exploration is very suitable to the area where 2-D seismic data are poor, but oil reserves maybe discovered.