准噶尔盆地红车断裂带石炭系火山岩油藏地球物理特征及有利储层预测

Geophysical Characteristics and Favorable Reservoir Prediction of Carboniferous Volcanic Reservoir in Hongche Fault Zone of Junggar Basin

准噶尔盆地西缘红车断裂带火山岩油气藏资源丰富,储量规模巨大,具有满带含油的特点。然而火山岩油藏受构造、相带、岩性控制,断裂复杂,岩性岩相变化快,非均质性强,致使优质储层难以识别。首先,基于岩石薄片、测井、地震等资料,分析了研究区石炭系发育的优势岩性以及不同岩性的测井响应特征,运用多参数分布交会法建立了自然伽马-密度、密度-电阻率/自然伽马、电阻率-自然伽马/密度的岩性识别组合图版,确定优势岩性特征,进而对目的层段的岩性进行了有效识别。然后,通过地震相、测井相、岩性特征及试油结果等资料的分析,明确研究区火山岩相、储盖组合和油藏分布规律。根据地震反射结构和反射构型特征,识别研究区典型的地震相特征;在岩石物理和敏感参数分析的基础上,发挥地震纹理属性和瞬时相位余弦属性在岩性体刻画、边界分析方面的优势,以及地震波形相控反演在提高储层识别垂向分辨率的同时,兼顾了横向预测的能力,综合运用地震多属性分析、波形相控反演和沿层切片技术,通过对地震平-剖面成果与井上有利储层的分析,最终确定优势储层的发育和空间分布范围,为落实准噶尔盆地红车断裂带火山岩储层油气优势聚集带提供了支持。

The Hongche fault zone,located in the western margin of the Junggar Basin,contains a significant amount of volcanic rock oil and gas reservoirs with a vast reserve of oil.However,the identification of high-quality reservoirs in these volcanic reservoirs is a challenge due to their structural complexity,lithological diversity and strong heterogeneity controlled by faults,facies zones and lithology.In order to better identify the high-quality reservoirs,the study was conducted to analyze the dominant lithology and logging response characteristics of different lithologies in the study area based on rock slice,logging,seismic,and other data.A combined lithology identification plate was established to facilitate better identification of high-quality reservoirs and the lithology of the target interval using the multi-parameter distribution intersection method,which includes density-gamma,density-resistivity/gamma,and resistivity-gamma/density.Seismic facies,logging facies,lithological characteristics,oil test results,and other relevant data were analyzed to define the volcanic facies,reservoir-cap combination,and reservoir distribution characteristics in the study area.Based on the seismic reflection structure and reflection characteristics,the typical seismic facies characteristics of the study area were identified.The advantages of seismic texture attributes and instantaneous phase cosine attributes in lithological characterization and boundary analysis were fully utilized through petrophysical and sensitive parameter analysis,and seismic waveform phased inversion was used to improve the vertical resolution of reservoir identification while considering the lateral prediction ability.The favorable distribution range of favorable reservoirs was finally determined by comprehensively using seismic multi-attribute analysis,waveform phased inversion,and slicing technology along layers and by analyzing seismic plane-profile results and favorable reservoirs on the well.The results provide support for the implementation of the favorable accumulation zone of volcanic reservoir oil and gas in the Hongche fault zone of the Junggar Basin.