【摘要】 位于准噶尔盆地腹部的陆西地区有大面积的火山岩分布,显示出良好的油气勘探前景。但该区石炭系火成岩埋藏较深,目前揭示石炭系火山岩地层或者更老火山岩地层的探井非常有限,只能利用地质资料和地震资料相结合的办法来研究该区石炭系火山岩岩相的分布特征。将该区石炭系火山岩体的地震反射特征划分为以下4种:舌状或楔状反射、板状反射、弧状反射、丘状或蘑菇状地震相反射特征;结合前人的研究成果和详细的井震对比,确定了不同的地震反射特征所对应的火山岩岩相。通过在地震剖面上的追踪对比,明确了该区石炭系火山岩岩相的分布情况:大致呈北东—南西向的条带状分布,西北部以喷溢相的基性火山岩为主,向东南依次过渡为爆发相火山岩、喷溢相中性火山岩;而储层条件也是由西北向东南逐渐变好,位于陆西地区东南部的石西凸起应作为下一步勘探的重点区域。更多还原

【Abstract】 Volcanic rocks are widely distributed in the Luxi area in the central Junggar Basin and show great potential of petroleum exploration.However,few exploratory wells have penetrated the Carboniferous or earlier volcanic rocks in the study area due to their great burial depth.The lithofacies distribution of the Carboniferous volcanic rocks can be identified only through the integration of geologic and seismic data.The seismic reflectance signatures of the Carboniferous volcanic rocks in the study area are divided into four types,including lobate/wedge reflection,tabular reflection,arc reflection,and mound/mushroom reflection.Based on previous studies and detailed well-seismic correlation,the lithofacies of volcanic rocks corresponding to different seismic reflectance signatures are recognized.Tracing and correlation on seismic section reveal that the lithofacies of the volcanic rocks are in roughly NE-SW trending zonal distribution.Eruption-facies basic lava dominate in the northwestern part,and they progressively transform into explosion-facies lava and eruption-facies intermediate lava to the south.Correspondingly,the reservoir conditions are also getting more and more favorable from the northwest to the southeast.The Shixi salient in the southeastern Luxi area should be the primary target for future exploration.更多还原