济阳拗陷浅、中层天然气藏地震预测技术
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摘要
济阳拗陷天然气藏主要聚集在上第三系及下第三系中上部,埋深为800-1800m。该区气藏具有数量多、厚度薄、面积小的特点。但该区浅中层天然气富集,储层含气前后岩石物理性质发生变化,为利用地震方法对其进行检测和描述提供了条件。由于该区气层处在大套泥岩之中,所以含气层呈亮点反射特征;中层气藏比浅层复杂,并以构造气藏为主,一般存在气/油或气/水分界面,故含气层多呈平点反射特征。浅、中层气藏的速度、密度均比围岩低,因此均有明显的AVO效应存在。利用上述反射特征,成功地预测了该区的气藏。
The gas reservoirs in Jiyang depression mainly accumulate in Tertiary and mid and upper parts of Paleogene, where the buried depths are 800m-1800m. The reservoirs are characters of a large number,thin thickness and small area. The gas-enriched characters in mid and shallow layers and changed petrophysical property of reservoirs before and after gas-bearing provided conditions for using seismic methods for detection and description. Be cause the gas reservoirs exist in a large set of mud rocks, the gas-bearing formation has bright feature; the mid gas reservoirs are more complex than the shallow ones, mainly are structural gas reservoirs,generally existing gas/oil or gas/water interfaces, which mainly have the flatten spot feature for reflections. The velocities and densities of mid and shallow gas reservoirs are all greater than the surrounding beds,thus the distinct AVO effect exists. Using abovementioned reflections feature, the gas reservoirs have been successfully predicted.
The gas reservoirs in Jiyang depression mainly accumulate in Tertiary and mid and upper parts of Paleogene, where the buried depths are 800m-1800m. The reservoirs are characters of a large number,thin thickness and small area. The gas-enriched characters in mid and shallow layers and changed petrophysical property of reservoirs before and after gas-bearing provided conditions for using seismic methods for detection and description. Be cause the gas reservoirs exist in a large set of mud rocks, the gas-bearing formation has bright feature; the mid gas reservoirs are more complex than the shallow ones, mainly are structural gas reservoirs,generally existing gas/oil or gas/water interfaces, which mainly have the flatten spot feature for reflections. The velocities and densities of mid and shallow gas reservoirs are all greater than the surrounding beds,thus the distinct AVO effect exists. Using abovementioned reflections feature, the gas reservoirs have been successfully predicted.
引文
[1]杨云岭等．中国东部地区天然气藏的地震识别和定量 描述技术研究．天然气工业,1994,14(增刊):46-50
[2]杨云岭,韩文功主编．天然气藏识别与预测技术．东营: 石油大学出版社,1996
[3]王捷,何立琨．济阳坳陷天然气复式聚集．复式油气田, 1997,试刊(1):1-7
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[5] 殷八斤,曾灏．AVO技术的理论与实践．北京:石油工 业出版社,1995
[6] 王兴谋等．浅层岩性气藏地震检测的陷阱分析．石油大 学学报(自然科学版),2003,27(1):19-22
[2]杨云岭,韩文功主编．天然气藏识别与预测技术．东营: 石油大学出版社,1996
[3]王捷,何立琨．济阳坳陷天然气复式聚集．复式油气田, 1997,试刊(1):1-7
[4] 汪云家等．济阳坳陷中层气藏的地震识别技术．石油物 探。1997,36(4):16-27
[5] 殷八斤,曾灏．AVO技术的理论与实践．北京:石油工 业出版社,1995
[6] 王兴谋等．浅层岩性气藏地震检测的陷阱分析．石油大 学学报(自然科学版),2003,27(1):19-22
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