DF气田开发方案调整的地球物理对策
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摘要
DF气田原开发方案是在二维地震资料研究成果的基础上制定的。针对原开发方案中存在的问题,依据三维地震资料,在对该气田开发方案进行调整中采取了相应的地球物理对策应用方差体技术对断层分布进行了全三维解释;应用波阻抗反演技术对含气砂体分布进行了精细描述;利用三维相对波阻抗体,对储层物性的横向非均质性进行了分析,并确定了气水边界;应用叠前层速度相干反演技术及射线追踪方法进行了气层顶底层位的时深转换;应用三维AVO反演技术对含气范围及其内部含气性变化做了进一步预测。依据三维地震资料研究成果并按照气田开发方案的调整原则,已顺利实现了DF气田开发井井位调整和井轨迹优化。已调整开发井的钻探结果证实了采取上述地球物理对策所获得的认识。
The initial ODP of DF gasfield was made on the basis of 2D seismic results, in which there are some problems. Therefore, the ODP has been adjusted according to 3D seismic, during which several geophysical strategies have been adopted: (1) The variance cube technique is applied to fully interpret faults; (2) Impedance is applied to carefully characterize the distribution of gas-bearing sands; (3) The relative impedance is used to analyze the lateral inhomogeneity of reservoir petrophysics, and to identify gas-water contact; (4) The techniques of interval velocity coherence inversion and ray tracking are used to convert the time maps of gas reservoir top and bottom to depth maps; (5) The 3D AVO inversion is used to further predict gas reservoir distribution and its variation. Based on the 3D seismic results and the ODP adjustment principles, the locations of development wells are successfully adjusted and the well tracks are optimized in DF gasfield. The drilling results of these development wells have confirmed the effects of these geophysical strategies.
The initial ODP of DF gasfield was made on the basis of 2D seismic results, in which there are some problems. Therefore, the ODP has been adjusted according to 3D seismic, during which several geophysical strategies have been adopted: (1) The variance cube technique is applied to fully interpret faults; (2) Impedance is applied to carefully characterize the distribution of gas-bearing sands; (3) The relative impedance is used to analyze the lateral inhomogeneity of reservoir petrophysics, and to identify gas-water contact; (4) The techniques of interval velocity coherence inversion and ray tracking are used to convert the time maps of gas reservoir top and bottom to depth maps; (5) The 3D AVO inversion is used to further predict gas reservoir distribution and its variation. Based on the 3D seismic results and the ODP adjustment principles, the locations of development wells are successfully adjusted and the well tracks are optimized in DF gasfield. The drilling results of these development wells have confirmed the effects of these geophysical strategies.
引文
1 韩文明,葛勇.岩性异常体自动解释方法.石油地球物理勘探,1999,34(增刊):85～88,95
2 GeoffreyADom等著.王宏琳译.现代三维地震解释.国外油气勘探,1999,11:165～174
3 韩文明.地震技术在复杂岩性油藏勘探与开发中的综合应用.中国海上油气(地质),2003,17(5):329～334
4 CastagnaJP,SmithSW.CompariosnofAVOindicators:Amodeling study:Geophysics,1994,59(12):1849～1855
2 GeoffreyADom等著.王宏琳译.现代三维地震解释.国外油气勘探,1999,11:165～174
3 韩文明.地震技术在复杂岩性油藏勘探与开发中的综合应用.中国海上油气(地质),2003,17(5):329～334
4 CastagnaJP,SmithSW.CompariosnofAVOindicators:Amodeling study:Geophysics,1994,59(12):1849～1855
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