【摘要】 车镇凹陷陡坡带沙三段砂砾岩扇体发育,但目前对砂砾岩体横向展布范围及砂砾岩体边界的划分尚不清楚,储层物性难以预测。首先,利用相干分析技术开展砂砾岩扇体沉积相的划分,明确了扇体的展布规律、分布范围、划清了砂砾岩扇体的边界。然后,利用声波、速度谱等资料探讨了沙三下亚段(Es3x)地层压力情况,认为Es3x存在欠压实超压带,车镇凹陷欠压实超压带的发现为寻找沙三段砂砾岩扇体储层物性良好发育区指明了方向。最后,利用地震高频能量衰减检测技术对储层物性进行了预测。通过地震高频能量衰减梯度法预测的储层物性良好发育区,位于研究区欠压实超压区带内,用地震能量高频波段的衰减特征不但可预测不同井位的储层物性,还可根据连井衰减梯度剖面的变化规律预测地震高频波段高衰减区的延伸范围。高频能量衰减梯度法预测的储层物性良好发育区带与实钻结果吻合度好。更多还原

【Abstract】 Sand-gravel body of Es3x in the northern steep slope of Chezhen sag are well developed,but their spreading range and boundary are not obvious,and the distribution of effective reservoirs are not affirmative either.Due to above conditions of the research area,the authors first block out the sediment facies of the sand-gravel fan by using coherent analysis technique and affirm the spreading range and boundary of the sand-gravel fan.Then they discuss the Es3x pressure of the research area by using sound wave data and velocity spectrum data,believing there exists under-compaction hyper-pressure zone in Es3x in the research zone.At last the authors forecast the petroleum-bearing feature of the sand-gravel body by using techniques of attenuation gradient of seismic energy.The favorable petroleum-bearing zone forecasted by techniques of attenuation gradient of seismic energy is located in under-compaction hyper-pressure zone.Techniques of attenuation gradient of seismic energy not only forecast the petroleum-bearing feature of the well,but can be used as step-out evidence of the oil field.The conformity of petroleum-bearing feature between the results forecasted by techniques of attenuation gradient of seismic energy and by the drilling results is good.更多还原