基于地震资料的烃源岩早期评价研究
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摘要
二连盆地布日敦南凹陷勘探程度很低,缺少井下地质和地球物理资料。根据叠加速度谱资料,利用地震波速度参数自身的变化规律与地下岩性之间的内在联系,预测了泥岩厚度;利用层速度,进行泥岩孔隙度转换,从而进一步预测烃源岩镜质体反射率,最终定量地圈定凹陷主力烃源岩的成熟区,为区带评价优选提供了依据。这种由地震信息直接测定镜质体反射率Ro的方法,对于勘探程度较低尤其是钻井稀少的盆地,有着较高的实用价值。
Exploration level was low in the south of Buridun Sag of Erlian Basin, where it lacked geological and geophysical data. Based on overlaying velocity data, mudstone thickness was predicted by using the rules of seismic wave velocity changes of itself and inherent relations between lithological properties, mudstone porosity was transformed by using interval velocity, thus vitrinite reflectance of source rocks was further predicted, therefore mature hydrocarbon source rock area was determined, and bases were provided for optimized regional evaluation. The method for direct determining Ro with seismic data has higher application valve for areas of low exploration level, especially for less well drilling basins.
Exploration level was low in the south of Buridun Sag of Erlian Basin, where it lacked geological and geophysical data. Based on overlaying velocity data, mudstone thickness was predicted by using the rules of seismic wave velocity changes of itself and inherent relations between lithological properties, mudstone porosity was transformed by using interval velocity, thus vitrinite reflectance of source rocks was further predicted, therefore mature hydrocarbon source rock area was determined, and bases were provided for optimized regional evaluation. The method for direct determining Ro with seismic data has higher application valve for areas of low exploration level, especially for less well drilling basins.
引文
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