济阳坳陷渤南洼陷古近系页岩油“甜点”地震预测及影响因素分析
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摘要
中国东部渤海湾盆地济阳坳陷古近系沙河街组发育一套富有机质页岩,页岩油"甜点"地震预测及影响因素分析将进一步推动有关济阳坳陷页岩油地震响应的研究。综合地震、钻井、测井、地球化学等资料,文章利用多属性线性回归方法研究了济阳坳陷渤南洼陷陆相页岩层系"甜点"地球物理响应特征并对其影响因素进行了分析。研究结果表明,渤南洼陷渤南洪城地震工区沙河街组沙三下亚段页岩油地质和工程"甜点"参数地震预测结果是有机质丰度TOC含量值为3%~6%,有机质成熟度Ro为0.81%~0.94%,页岩孔隙度为5.0%~12.5%,地层压力为33~58 MPa,压力系数为1.3~1.8,脆性指数为大于40%。沙河街组页岩油地质和工程"甜点"地球物理响应特征主要受岩石物理参数、叠后波阻抗反演地震体、自然伽马GR地震体和振幅等因素的影响,且这些因素在不同程度上影响该区"甜点"参数的预测结果。综合研究显示济阳坳陷渤南洼陷沙河街组主要发育"连续型甜点"的页岩油地震响应模式,叠后波阻抗反演地震体是影响沙河街组页岩油"甜点"地震预测最为重要的因素。
Organic-rich terrestrial shales developed in the Paleogene Shahejie Formation in the Jiyang depression,Bohai Bay Basin,China.Seismic prediction of shale oil sweet spots and its influencing factor analysis shall promote studies on shale oil seismic response in the Jiyang depression.Based on seismic,drilling,logging and geochemistry data,we investigated the geophysical response characteristics of shale oil sweet spots using multi-attribute regression method,and performed the influencing factor analysis.The results revealed the parameters for shale oil geological and engineering sweet spots in the lower interval of the 3 rd Shahejie Formation in the BNHC seismic area,Bonan sub-sag,Jiyang depression.Organic richness and shale porosity were in the ranges of 3%-6% and 5.0%-12.5%,respectively,with Ro value between 0.81% and 0.94%.Furthermore,widespread overpressure developed in the Shahejie Formation shale reservoir with pressure coefficient between 1.3 and 1.8.And shale brittle index was more than 40%in the Shahejie Formation.Factors affecting geophysical response characteristics of shale oil geological and engineering sweet spots included rock physics parameters,poststack seismic P-impedance and S-impedance inversion data volumes,GR response volume,amplitude,etc.These factors affect the prediction of"sweet spots"to varying degrees.Our comprehensive study results suggest that a "continuous sweet spots"seismic response mode was developed in the Shahejie Formation,and poststack acoustic inversion volume is considered to be the most important factor affecting seismic prediction of shale oil sweet spots in the Shahejie Formation.
Organic-rich terrestrial shales developed in the Paleogene Shahejie Formation in the Jiyang depression,Bohai Bay Basin,China.Seismic prediction of shale oil sweet spots and its influencing factor analysis shall promote studies on shale oil seismic response in the Jiyang depression.Based on seismic,drilling,logging and geochemistry data,we investigated the geophysical response characteristics of shale oil sweet spots using multi-attribute regression method,and performed the influencing factor analysis.The results revealed the parameters for shale oil geological and engineering sweet spots in the lower interval of the 3 rd Shahejie Formation in the BNHC seismic area,Bonan sub-sag,Jiyang depression.Organic richness and shale porosity were in the ranges of 3%-6% and 5.0%-12.5%,respectively,with Ro value between 0.81% and 0.94%.Furthermore,widespread overpressure developed in the Shahejie Formation shale reservoir with pressure coefficient between 1.3 and 1.8.And shale brittle index was more than 40%in the Shahejie Formation.Factors affecting geophysical response characteristics of shale oil geological and engineering sweet spots included rock physics parameters,poststack seismic P-impedance and S-impedance inversion data volumes,GR response volume,amplitude,etc.These factors affect the prediction of"sweet spots"to varying degrees.Our comprehensive study results suggest that a "continuous sweet spots"seismic response mode was developed in the Shahejie Formation,and poststack acoustic inversion volume is considered to be the most important factor affecting seismic prediction of shale oil sweet spots in the Shahejie Formation.
引文
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[35]宋国奇,徐兴友,李政,等.济阳坳陷古近系陆相页岩油产量的影响因素[J].石油与天然气地质,2015,36(3):463-471.
[36]宁方兴.济阳坳陷页岩油富集主控因素[J].石油学报,2015,36(3):465-471.
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