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在缺少钻井资料的低勘探程度地区进行烃源岩评价和油气前景预测的难度较大。由于烃源岩与非烃源岩之间在平均振幅、平均能量等地震属性上存在明显差别,据此建立了一套利用层序地层学及地震地层学识别烃源岩,根据地震速度谱信息去除烃源岩体中砂质含量,由烃源岩体提取的地震属性与实测烃源岩有机碳含量等地化参数的对应关系,定量预测烃源岩有机碳含量的方法。利用该方法预测和评价了武清凹陷大孟庄洼槽沙三段中、下亚段和沙四段上亚段3个层系的烃源岩,其有机碳含量分布表现为西高东低,南高北低的特点,进而确定研究区南部的京24井—务古1井为有利的油气聚集区。
It is more difficult to evaluate hydrocarbon source rocks and predict the future of oil and gas in low-exploration areas lacking drilling data. Because there is a clear difference in seismic attributes such as average amplitude and average energy between source rock and non-source rock, a series of source rocks are established using sequence stratigraphy and seismic stratigraphy. Based on the information of seismic velocity spectrum The method of quantitatively predicting the organic carbon content of source rocks by removing the correlation of the sandy content in the source rock mass, the seismic attribute extracted from the source rock mass and the organic carbon content of the source rock, etc. This method is used to predict and evaluate the source rocks of three strata in the middle and lower reaches of Shahejie Formation in the Lower Reaches of Damengzhuang in Wumeng Sag of Wuqing Depression. The organic carbon content of the three source rocks shows as follows: High in the north and low in the north of the study area, so as to confirm that the Jing-24-Kungu-1 well in the southern part of the study area is a favorable hydrocarbon accumulation area.