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鄂尔多斯盆地SG气田是我国典型的低孔,低渗,致密砂岩气藏的代表.该区地震勘探开发面临着两大难题:一是含气砂岩和围岩的声波阻抗存在较大范围叠置,利用声波阻抗预测储层存在明显的多解性;二是SG气田局部地区气、水关系复杂,地质上不存在统一的气、水层分界面,产水井严重影响产能建设,流体类型的识别是面临的又一难题.为了降低声波阻抗预测砂岩储层的多解性,提高有效储层预测精度,定量识别储层中流体的类型,本文提出了叠前地震弹性参数交会定量解释技术,从横波测井资料不同岩性、流体的岩石物理参数分析入手,优选了能够区分岩性和流体的最佳敏感弹性参数,制作了敏感弹性参数交会模板,通过地震叠前反演获得反映储层物性和含气性的地震弹性参数体,最后进行地震弹性参数交会定量解释预测有效储层和识别流体.勘探实例证实了该技术方法在SG地区对有效储层的预测是有效的,能够为井位优选提供可信的依据.地震弹性参数交会技术将纵向分辨率较高的测井岩石物理分析和横向分辨率较高的地震叠前反演结合在一起,使用了多个弹性参数交会,减少了以往单一弹性参数预测储层的多解性,最终获得比较可靠、更量化的反映储层物性和含气性的地震弹性参数交会体,为有效储层预测和流体识别探索出了新的途径,这一技术的应用和推广可以降低地震解释的风险,提高储层预测精度.
The SG gas field in Ordos Basin is a typical representative of low-porosity, low-permeability and tight sandstone gas reservoirs in China.Seismic exploration and development in this area face two major problems: firstly, the acoustic impedance of gas-bearing sandstone and surrounding rock has a large overlap, The acoustic impedance is used to predict the existence of obvious multi-solution. Second, the relationship between gas and water in some areas of SG gas field is complex. There is no uniform interface between gas and water in the geologic area. Production wells seriously affect the capacity construction. The identification of fluid type is In order to reduce the multi-solution of sandstone reservoir by acoustic impedance, improve the accuracy of effective reservoir prediction and quantitatively identify the type of fluid in reservoir, a quantitative interpretation technique of prestack seismic elastic parameter intersection is proposed in this paper, Logging data from different lithologies and petrophysical parameters of fluid, the best sensitive elastic parameters that can distinguish lithology and fluid are optimized, and the sensitive elastic parameter intersection template is made. By seismic prestack inversion, Gas-bearing seismic elastic parameter body, and finally quantitatively interpreting and predicting the effective reservoir and identifying fluid by the seismic elastic parameter intersection.The exploration example proves that this technology Prediction of effective reservoirs in the SG area is effective and can provide credible basis for well location optimization.Elasticity parameters of the seismic intersection technology will be higher resolution vertical well log petrophysical analysis and seismic transversal resolution stack Combined with the previous inversion, multiple elastic parameters are used for the rendezvous, which reduces the previous multi-solution of the single elastic parameter prediction reservoir and finally obtains more reliable and quantitative seismic elastic parameters that reflect the reservoir physical properties and gas-bearing properties This paper explores new ways for effective reservoir prediction and fluid identification. The application and popularization of this technology can reduce the risk of seismic interpretation and improve the prediction accuracy of reservoir.