论文部分内容阅读
AVO分析方法是利用地震反射波振幅与炮检距的关系来识别岩性、检测油气的一种地震技术。它充分利用地震采集中的多种信息 ,进行资料处理与分析 ,对于岩性勘探有很好的帮助。鄂尔多斯盆地上古生界下二叠统山西组含气砂岩主要属湖相三角洲平原分流河道沉积 ,是一种具低孔低渗和高阻抗特征的岩性气藏。在岩性处理解释上 ,很难区分含气砂岩和致密砂岩。引入AVO处理分析方法 ,利用不同岩性泊松比差异所形成的AVO特征响应 ,可以有效区分地震高阻抗层的岩性及含气性 ,部分避免了地震岩性解释上的陷阱。在长庆气田榆林区山西组山 2段高阻抗砂岩气藏的勘探开发中 ,应用高保真的CDP道集资料进行AVO处理分析 ,提高了天然气钻井的成功率 ,取得了较好的应用效果。
AVO analysis method is to use the relationship between seismic reflection amplitude and offset to identify lithology, an oil and gas detection technology. It takes full advantage of a variety of information collected in the seismic acquisition, data processing and analysis, for lithological exploration is very good help. The gas bearing sandstone of the Lower Permian Shanxi Formation in the Upper Paleozoic of the Ordos Basin mainly belongs to distributary channel sedimentation in the deltaic plain of the lacustrine facies. It is a lithologic gas reservoir with low porosity, low permeability and high resistivity. In the interpretation of lithology, it is difficult to distinguish between gas-bearing sandstone and tight sandstone. The introduction of AVO processing and analysis method, using the AVO characteristic response formed by different lithology Poisson’s ratio differences, can effectively distinguish the lithology and gas-bearing of the seismic high impedance layer and partly avoid the trap of seismic lithology interpretation. In the exploration and development of the high impedance sandstone gas reservoirs in Shanxi Group 2, Yulin District, Changqing Gas Field, the application of high fidelity CDP gathers data to AVO treatment analysis has improved the success rate of natural gas drilling and achieved good application results.